A feature that answers calls, and then, depending on
An extension or attendant group, VDN, or ACD split designated as an alternate answering position in a cov­erage path.

A terminal that is used to administer and maintain a system.

A work mode in which agents are unavailable to receive Avaya™ Media Gateway
A family of application-enabling hardware elements: intra-switch connectivity, controlinterfaces, port inter­faces and cabinets. They support both bearer and signaling traffic routed between packet-switched and cir­cuit-switched networks, in order todeliver data, voice, fax and messaging capabilities. They provide protocol conversion(IP to ATM to TDM), conferencing, presence (on-hook/off-hook), connectivity (to pri­vate/publicnetworks, IP/ATM/TDM) and networking (QSIG/DCS/ISDN). Optional form factors are sup­ported.

A feature that routes calls to other than the first-choice route when facilities are unavailable are unavailable.

abandoned call
An incoming call in which the caller hangs up before the call is answered.

Abbreviated Dialing (AD)
A feature that allows callers to place calls by dialing just one or two digits.

ATM access concentrator

access code
A 1-, 2-, or 3-digit dial code used to activate or cancel a feature, or access an outgoing trunk.

access endpoint
Either a nonsignaling channel on a DS1 interface or a nonsignaling port on an analog tie-trunk circuitpack that is assigned a unique extension.

Access endpoints, extended with wideband switching to include wideband access endpoints.
wink-start tie trunk

access tie trunk
A trunk that connects a main communications system with a tandem communications systemin an electronic tandem network (ETN). An access tie trunk can also be used to connecta system or tandem to a serving office or service node. Also called access trunk.

ACD also refers to a work state in which an agent is on an ACD call.

active-notification association
A link that is initiated by an adjunct, allowing it to receive event reports for a specific switch entity,such as an outgoing call.

active-notification call
A call for which event reports are sent over an active-notification association (communicationchannel) to the adjunct. Sometimes referred to as a monitored call.

active notification domain
VDN or ACD split extension for which event notification has been requested.

AUDIX Data Acquisition Package

adjunct-control association
A relationship initiated by an application via Third Party Make Call, the Third PartyTake Control, or Domain (Station) Control capabilities to set up calls and controlcalls already in progress.

adjunct-controlled call
A call that can be controlled using an adjunct-control association. Call must havebeen originated via Third Party Make Call or Domain (Station) Control capabilitiesor must have been taken control of via Third Party Take Control or Domain (Station)Control capabilities.

adjunct-controlled split
An ACD split that is administered to be under adjunct control. Agents logged into such splitsmust do all telephony work, ACD login/ logout, and changes of work mode through the adjunct (exceptfor auto-avail­able adjunct-controlled splits, whoseagents may not log in/out or change work mode).

adjunct-monitored call
An adjunct-controlled call, active-notification call, or call that provides event reporting over adomain-con­trol association.

Adjunct-Switch Application Interface (ASAI)

Various items that connect to Avaya MultiVantage solutions, such as Intuity.

Asynchronous data module

To access and change parameters associated with the services or features of a system.

Administered Connection (AC)
A feature that allows the switch to automatically establish and maintain end-to-endconnections between access endpoints (trunks) and/or data endpoints (data modules).

administration terminal

Administration Without Hardware (AWOH)
A feature that allows administration of ports without associated terminals or other hardware.

Acoustic Echo Cancellation, a signal processing technique that significantly reducesthe coupling of a received audio signal back into an active microphone.

after-call work (ACW) mode
A mode in which agents are unavailable to receive ACD calls. Agents enter the ACWmode to perform ACD-related activities such as filling out a form after an ACD call.

ASAI Gateway

A person who receives calls directed to a split. A member of an ACD hunt group or ACD split. Also called an ACD agent.

agent report
A report that provides historical traffic information for internally measured agents.

Asynchronous interface module

Automatic Identification of Outward Dialing

Automatic Line Build Out

all trunks busy (ATB)
The state in which no trunks are available for call handling.

Alarm acknowledge.

Common abbreviations for ALARM, an indication generated by a system to indicate thepresence of a fault.

Alternate voice/data

American Standard Code for Information Interchange
The standard code for representing characters in digital form. Each character isrepresented by an 8-bit code (including parity bit).

Automatic Message Waiting


The representation of information by continuously variable physical quantities such as amplitude, frequency, and phase. See also digital.

analog-to-digital converter (ADC)
A device that converts an analog signal to digital form. See also digital-to-analog converter (DAC).

analog data
Data that is transmitted over a digital facility in analog (PCM) form. The data must pass through a modem either at both ends or at a modem pool at the distant end.

analog telephone
A telephone that receives acoustic voice signals and sends analog electrical signalsalong the telephone line. Analog telephones are usually served by a single wire pair(tip and ring). The model-2500 telephone set is a typical example of an analog telephone.

Processor responsible for controlling the operation of the port board on which itresides, under the direction of the archangel and the SPE. It functions in a slaverole on the TDM bus control channel.

Automatic Number Identification

Recorded Messages played in telephony.

answerback code
A number used to respond to a page from a code-calling or loudspeaker-paging system,or to retrieve a parked call.

Attendant-offered load

Applications processor

Advanced Private-Line Termination

A software process that is associated with an extension and whose purpose is to supervise a call.  An extension can have appearances. Also called call appearance,line appearance, and occurrence.

Application Programming Interface (API)
The programming interface between two software entities. For example, maintenancedefines an API which is used as the interface between SNMP and maintenance.

The master controller of the TDM bus control channel. It relays CCMS messages betweenthe SPE and the port boards, while handling low-level functions such as sanity, activity,and overload scanning, and the acknowledgment of messages sent to and received fromthe angels under its control.

The organizational structure of a system, including hardware and software.

Address Resolution Protocol, IETF STD 37. RFC 826.


Adjunct-Switch Application Interface (ASAI).

Access Security Gateway.

A communication channel between adjunct and switch for messaging purposes. An activeassociation is one that applies to an existing call on the switch or to an extensionon the call.

asynchronous data transmission
A method of transmitting data in which each character is preceded by a start bitand followed by a stop bit, thus permitting data characters to be transmitted atirregular intervals. This type transmission is advanta­geous when transmission isnot regular (characters typed at a keyboard). Also called asynchronous transmis­sion.See also synchronous data transmission.

asynchronous data unit (ADU)
A device that allows direct connection between RS-232C equipment and a digital switch.

Asynchronous Transfer Mode (ATM)
ATM is a dedicated-connection switching technology that organizes digital data into53 byte cell units and transmits them over a physical medium using digital signaltechnology. Individually, a cell is processed asyn­chronous relative to other relatedcells and is queued before being multiplexing over the transmission path.

All trunks busy.

Attention dial

A person at a console who provides personalized service for incoming callers andvoice-services users by performing switching and signaling operations. See also attendantconsole.

attendant console
The workstation used by an attendant. The attendant console allows the attendantto originate a call, answer an incoming call, transfer a call to another extensionor trunk, put a call on hold, and remove a call from hold. Attendants using the consolecan also manage and monitor some system operations. Also called console. See alsoattendant.

attention dial (ATD)
A command in the Hayes modem command set for asynchronous modems.

A fully integrated voice-mail system. Can be used with a variety of communicationssystems to provide call-history data, such as subscriber identification and reason for redirection.

auto-in trunk group
Trunk group for which the CO processes all of the digits for an incoming call. Whena CO seizes a trunk from an auto-in trunk group, the switch automatically connectsthe trunk to the destination - typically an ACD split where, if no agents are available,the call goes into a queue in which callers are answered in the order in which theyarrive.

Auto-In Work mode
One of four agent work modes: the mode in which an agent is ready to process another  call as soon as the current call is completed.

Automatic Alternate Routing (AAR)
A feature that routes calls to other than the first-choice route when facilities  are unavailable.

Automatic Call Distribution (ACD)

Automatic Call Distribution (ACD) split
A method of routing calls of a similar type among agents in a call center. Also,a group of extensions that are staffed by agents trained to handle a certain typeof incoming call.

Automatic Callback (ACB)
A feature that enables internal callers, upon reaching a busy extension, to havethe system automatically con­nect and ring both parties when the called party becomesavailable.

Automatic calling unit (ACU)
A device that places a telephone call.

Automatic Circuit Assurance (ACA)
A feature that tracks calls of unusual duration to facilitate troubleshooting. Ahigh number of very short calls or a low number of very long calls may signify afaulty trunk.

Automatic Number Identification (ANI)
Representation of the calling number, for display or for further use to access informationabout the caller.

automatic restoration
A service that restores disrupted connections between access endpoints (nonsignaling trunks) and data end­points (devices that connect the switch to data terminal and/orcommunications equipment). Restoration is done within seconds of a service disruptionso that critical data applications can remain operational.

Automatic Route Selection (ARS)
A feature that allows the system to automatically choose the least-cost way to send a toll call.


Aux-Work mode

auxiliary equipment
Equipment used for optional system features, such as Loudspeaker Paging and Music-on-Hold.

auxiliary trunk
A trunk used to connect auxiliary equipment, such as radio-paging equipment, to acommunications system.

Avaya MultiVantage™
An open, scalable, highly reliable and secure telephony application. Avaya MultiVantage™call processing software provides user and system management functionality, intelligentcall routing, application integration and extensibility, and Enterprise Communicationsnetworking.

Avaya   ™ Media Server
A family of application-enabling processing platforms, based on open CPUs and industryoperating systems. They provide centralized Enterprise Class call processing thatmay be distributed across a multi-protocol net­work including but not limited toIP, to support a highly diversified network architecture. In addition, they providemultiple features such as user and system management functionality, intelligent callrouting, applica­tion integration, mobility, and conferencing.

Avaya™ MultiService Network Manager
The network management platform developed for use with the Avaya™ product family.

Avaya™ Policy Manager
Software developed for the Avaya™ product line to implement policy management.

Alternate voice/data


Average work time


The difference, expressed in hertz, between the defined highest and lowest frequenciesin a range.

barrier code
A security code used with the Remote Access feature to prevent unauthorized accessto the system.

Basic Rate Interface (BRI)
A standard ISDN frame format that specifies the protocol used between two or morecommunications sys­tems. BRI runs at 192 Mbps and provides two 64-kbps B-channels(voice and data) and one 16-kbps D-chan­nel (signaling). The D-channel connects,monitors, and disconnects all calls. It also can carry low-speed packet data at 9.6kbps.


Basic Call Management System

See business communications terminal (BCT).

Bearer capability class
Code that identifies the type of a call (for example, voice and different types ofdata). Determination of BCC is based on the caller's characteristics for non-ISDNendpoints and on the Bearer Capability and Low-Layer Compatibility Information Elementsof an ISDN endpoint. Current BCCs are 0 (voice-grade data and voice), 1 (DMI mode1, 56 kbps data transmission), 2 (DMI mode 2, synchronous/asynchronous data transmissionup to 19.2 kbps) 3 (DMI mode 3, 64 kbps circuit/packet data transmission), 4 (DMImode 0, 64 kbps syn­chronous data), 5 (temporary signaling connection, and 6 (widebandcall, 128-1984 kbps synchronous data).

Bit error rate

Busy Hour Call Capacity.

Bipolar Eight Zero Substitution
A line encoding algorithm that guarantees ones density by removing an octet of allzeros and replacing the octet with a pattern that contains bipolar line violationsin specific bit locations. When received by a B8ZS receiver, the substituted patternoctet is removed and replaced by the original all zeros octet.

bit (binary digit)
One unit of information in binary notation, having two possible values: 0 or 1.

A device that supports LAN-to-LAN communications. Bridges may be equipped to provideframe relay sup­port to the LAN devices they serve. A frame-relay-capable bridgeencapsulates LAN frames in frame relay frames and feeds those frame relay framesto a frame relay switch for transmission across the network. A frame-relay- capablebridge also receives frame relay frames from the network, strips the frame relayframe off each LAN frame, and passes the LAN frame on to the end device. Bridgesare generally used to connect local area network (LAN) segments to other LAN segmentsor to a wide area network (WAN). They route traffic on the Level 2 LAN protocol (e.g.,the Media Access Control address), which occupies the lower sub layer of the LANOSI data link layer. See also router.

bridged appearance
A call appearance on a voice terminal that matches a call appearance on another voiceterminal for the dura­tion of a call.

British Thermal Unit

1. In hardware, a circuit or component that isolates one electrical circuit fromanother. Typically, a buffer holds data from one circuit or process until anothercircuit or process is ready to accept the data. 2. In software, an area of memory that is used for temporary storage.


Housing for racks, shelves, or carriers that hold electronic equipment.

Physical connection between two pieces of equipment (for example, data terminal andmodem) or between a piece of equipment and a termination field.

cable connector
A jack (female) or plug (male) on the end of a cable. A cable connector connectswires on a cable to specific leads on telephone or data equipment.


call-control capabilities
Capabilities (Third Party Selective Hold, Third Party Reconnect, Third Party Merge)that can be used in either of the Third Party Call Control ASE (cluster) subsets(Call Control and Domain Control).

call-reference value (CRV)
An identifier present in ISDN messages that associates a related sequence of messages.In ASAI, CRVs dis­tinguish between associations.

call-waiting ringback tone
A low-pitched tone identical to ringback tone except that the tone decreases in thelast 0.2 seconds (in the United States). Call-waiting ringback tone notifies theattendant that the Attendant Call Waiting feature is activated and that the calledparty is aware of the waiting call. Tones in international countries may sound different.

call appearance
1. For the attendant console, six buttons, labeled a-f, used to originate, receive,and hold calls. Two lights next to the button show the status of the call appearance.2. For the voice terminal, a button labeled with an extension and used to place outgoingcalls, receive incom­ing calls, or hold calls. Two lights next to the button showthe status of the call appearance.

Call Detail Recording (CDR)
A feature that uses software and hardware to record call data (same as CDRU).

Call Detail Recording utility (CDRU)
Software that collects, stores, optionally filters, and outputs call-detail records.

Call Management System (CMS)
An application, running on an adjunct processor, that collects information from anACD unit. CMS enables customers to monitor and manage telemarketing centers by generatingreports on the status of agents, splits, trunks, trunk groups, vectors, and VDNs,and enables customers to partially administer the ACD feature for a communicationssystem.

call vector
A set of up to 15 vector commands to be performed for an incoming or internal call.

call work code
A number, up to 16 digits, entered by ACD agents to record the occurrence of customer-definedevents (such as account codes, social security numbers, or phone numbers) on ACDcalls.

callback call
A call that automatically returns to a voice-terminal user who activated the AutomaticCallback or Ringback Queuing feature.

Centralized Automatic Message Accounting

A request or indication of an operation. For example, Third Party Make Call is arequest for setting up a call; event report is an indication that an event has occurred.

capability group
Set of capabilities, determined by switch administration, that can be requested byan application. Capability groups denote association types. For example, Call Controlis a type of association that allows certain func­tions (the ones in the capabilitygroup) to be performed over this type of association. Also referred to as administrationgroups or application service elements (ASEs).

Carrier Port and Power Unit for AC Powered Systems

carried load
An enclosed shelf containing vertical slots that hold circuit packs.

Centralized Attendant Service or Call Accounting System

cascade module
A module inserted into the back of an Avaya™ P330 family member (including the Avaya™G700 Media Gateway), which connects the member to the Octaplane.CA-

cause value
A value is returned in response to requests or in event reports when a denial orunexpected condition occurs. ASAI cause values fall into two coding standards: CodingStandard 0 includes any cause values that are part of AT&T and CCITT ISDN specifications;Coding standard 3 includes any other ASAI cause values. This document uses a notationfor cause value where the coding standard for the cause is given first, then a slash,then the cause value. Example: CS0/100 is coding standard 0, cause value 100.

Common-Channel Interoffice Signaling

CCITT (Committee Consultatif International Telephonique et Telegraphique), now calledInternational Tele­communications Union (ITU).

Control-Channel Message Set


CCS or hundred call seconds
A unit of call traffic. Call traffic for a facility is scanned every 100 seconds.If the facility is busy, it is assumed to have been busy for the entire scan interval.There are 3600 seconds per hour. The Roman numeral for 100 is the capital letterC. The abbreviation for call seconds is CS. Therefore, 100 call seconds is abbreviatedCCS. If a facility is busy for an entire hour, then it is said to have been busyfor 36 CCS. See also Erlang.


Channel-division multiplexing

Customer-dialed and operator serviced



Call Detail Record Poller


Call Detail Recording utility

Letters used to mark products that conform to type approval standards of the EuropeanUnion (EU).

Caller entered digits

Channel-expansion multiplexing

center-stage switch (CSS)
The central interface between the processor port network and expansion port networksin a CSS-connected system.

central office (CO)
The location housing telephone switching equipment that provides local telephoneservice and access to toll facilities for long-distance calling.

central office (CO) codes
The first three digits of a 7-digit public-network telephone number in the UnitedStates.

central office (CO) trunk
A telecommunications channel that provides access from the system to the public networkthrough the local CO.


Caller's Emergency Service Identification

1. A circuit-switched call. 2. A communications path for transmitting voice and data. 3. In wideband, all of the time slots (contiguous or noncontiguous) necessary tosupport a call. Example: an H0-channel uses six 64-kbps time slots. 4. A DS0 on a T1 or E1 facility not specifically associated with a logical circuit-switchedcall; analogous to a single trunk.

Channel Associated Signaling (CAS)
This is a method of signaling used with non- ISDN digital trunks. This method isonly defined for E1 trunks, and is bit oriented by nature. Typically for ITUT definedE1 trunks, CAS signaling is carried over E1 timeslot 16 while framing is carriedover TS0.

channel negotiation
The process by which the channel offered in the Channel Identification InformationElement (CIIE) in the SETUP message is negotiated to be another channel acceptableto the switch that receives the SETUP mes­sage and ultimately to the switch thatsent the SETUP. Negotiation is attempted only if the CIIE is encoded as Preferred.Channel negotiation is not attempted for wideband calls.

Challenge-Handshake Authentication Protocol.


Controlled-LAN. Provides TCP/IP connectivity over ethernet or PPP to adjuncts. Thiscircuit pack in a DEFINITY port network serves as a DEFINITY server’s network interface.It terminates IP (TCP & UDP) and relays those sockets and connections up to the DEFINITYserver.

Class of Restriction (COR)

Class of Service (COS)
A feature that uses a number to specify if voice-terminal users can activate theAutomatic Callback, Call For­warding All Calls, Data Privacy, or Priority Callingfeatures. See also Class of Restriction (COR).

Command line interface. A simple terminal interface as might be provided via telnetor a serial port provid­ing management functions. MultiVantage SAT and UNIX's shellare examples.

Clock input
Clock input

Connection Manager


Call Management System

Coder/decoder or compressor/decompressor - a device, typically implemented in DSPfirmware, which con­verts data from one format to another.

COM port
Communications ports; UNIX only recognizes COM1 and COM2 and presents them to theuser as TTY port. DOS also recognizes COM3 an COM4, although there will be contentionfor the interrupt line when all COM ports are in use.

common-control switching arrangement (CCSA)
A private telecommunications network using dedicated trunks and a shared switchingcenter for intercon­necting company locations.

communications controller (CC)
The server running the Avaya MultiVantage™ application from the perspective of aG700 media gateway. When the CC is a Avaya™ media module, it's called the Avaya™S8300 Media Server. The S8300 may also run INTUITY and other applications. In theexternal configuration, the CC is an Avaya™ S8700 Media Server.

communications system
The software-controlled processor complex that interprets dialing pulses, tones,and keyboard characters and makes the proper connections both within the system andexternal to the system. The communications sys­tem itself consists of a digital computer,software, storage device, and carriers with special hardware to per­form the connections.A communications system provides voice and data communications services, includingaccess to public and private networks, for telephones and data terminals on a customer'spremises. See also switch.

Audio coding process that reduces 64 Kbps audio streams to sub-16 Kbps rates, atthe expense of delay and audio quality. Useful for transport over limited bandwidthdial-up PPP connections. Usually referred to as CODEC compression/ decompression.Common standard CODECs are G.723a and G.729.

concentration highway
A serial TDM bus used to interconnect communications devices.

confirmation tone
A tone confirming that feature activation, deactivation, or cancellation has beenaccepted.

Adjacent DS0s within one T1 or E1 facility or adjacent TDM or fiber time slots. Thefirst and last TDM bus, DS0, or fiber time slots are not considered contiguous (nowraparound). For an E1 facility with a D-channel, DS0s 15 and 17 are considered contiguous.

coverage answer group
A group of up to eight voice terminals that ring simultaneously when a call is redirectedto it by Call Cover­age. Any one of the group can answer the call.

coverage call
A call that is automatically redirected from the called party's extension to an alternateanswering position when certain coverage criteria are met.

coverage path

coverage point
A person at a coverage point who answers a redirected call.

Customer-premises equipment

Calling-party number/billing number

Cyclical Redundancy Checking

Center-stage switch

A Channel Service Unit/Data Service Unit is a hardware device that in one form isabout the size of an exter­nal modem. The unit converts digital data frames fromthe communications technology used on a local area network (LAN) into frames appropriateto a wide-area network (WAN) and vice versa. The Channel Service Unit (CSU) receivesand transmits signals from and to the WAN line and provides a barrier for electricalinterference from either side of the unit. The CSU can also echo loopback signalsfrom the phone company for testing purposes. The Data Service Unit (DSU) managesline control, and converts input and output between RS-232C, RS-449, or V.xx framesfrom the LAN and the time-division multiplexed (Time-Division Multiplexing) DSX frameson the T-1 line. The DSU manages timing errors and signal regeneration. The DSU providesa modem-like interface between the computer as Data Terminal Equipment (Data TerminalEquipment) and the CSU. CSU/DSUs are made as separate products or are sometimes partof a T-1 WAN card. A CSU/DSU's Data Terminal Equipment interface is usually compatiblewith the V.xx and RS-232C or similar serial interface. The DSU provides an interfaceto the data terminal equipment (DTE) using a stan­dard (EIA/CCITT) interface. Italso provides testing capabilities.

D-channel backup

1. Dial access code or Direct Agent Calling 2. See digital-to-analog converter (DAC).

data-communications equipment (DCE)
The equipment (usually a modem, data module, or packet assembler/disassembler) onthe network side of a communications link that makes the binary serial data fromthe source or transmitter compatible with the communications channel.

delay-dial trunk
A trunk that allows dialing directly into a communications system (digits are receivedas they are dialed).

designated voice terminal
The specific voice terminal to which calls, originally directed to a certain extension,are redirected. Com­monly used to mean the forwarded-to terminal when Call ForwardingAll Calls is active.

This term specifically describes an entity in an Avaya™ managed network which isaccessed from the Avaya™ MultiService product suite, and managed by a Java-basedsoftware entity called a Device Manager.

Dynamic Host Configuration Protocol, an IETF protocol, RFCs 951, 1534, 1542, 2131& 2132.

Differentiated Services (DiffServ, or DS) is a protocol for specifying and controllingnetwork traffic by class so that certain types of traffic get precedence - for example,voice traffic, which requires a relatively uninter­rupted flow of data, might getprecedence over other kinds of traffic. Differentiated Services is the most advancedmethod for managing traffic by Class of Service (CoS). Differentiated Services avoidssimple pri­ority tagging and depends on more complex policy or rule statements to determine how to forward a given network packet.

digital communications protocol
A proprietary protocol used to transmit both digitized voice and digitized data overthe same communica­tions link. A DCP link is made up of two 64-kbps information (I-)channels and one 8-kbps signaling (S-) channel. The DCP protocol supports two information-bearingchannels, and thus two telephones/data mod­ules. The I1 channel is the DCP channelassigned on the first page of the 8411 station form. The I2 channel is the DCP channelassigned on the analog adjunct page of the 8411 station form or on the data modulepage. Digital Communications Protocol. The DCP protocol supports two information-bearingchannels, and thus two telephones/data modules.

digital data endpoints
Devices such as the 510D terminal or the 515-type business communications terminal(BCT).

digital multiplexed interface (DMI)
An interface that provides connectivity between a communications system and a hostcomputer or between two communications systems using DS1 24th-channel signaling.DMI provides 23 64-kbps data channels and 1 common-signaling channel over a twisted-pairconnection. DMI is offered through two capabilities: bit-oriented signaling (DMI-BOS)and message-oriented signaling (DMI-MOS).

digital signal level 0
A single 64-kbps voice channel. A DS0 is a single 64-kbps channel in a T1 or E1 facilityand consists of eight bits in a T1 or E1 frame every 125 microseconds.

digital signal level 1
Digital signal X is a term for the series of standard digital transmission ratesor levels based on DS0, a trans­mission rate of 64 Kbps, the bandwidth normally used for one telephone voice channel. Both the North American T-carrier system and theEuropean E-carrier systems of transmission operate using the DS series as a basemultiple. The digital signal is what is carried inside the carrier system. DS0 isthe base for the digital signal X series. DS1, used as the signal in the T-1 carrier,is 24. DS0 (64 Kbps) signals transmitted using pulse-code modulation (pulse codemodulation) and time-division multiplexing (Time-Division Multiplex­ing). DS-2 isfour DS1 signals multiplexed together to produce a rate of 6.312 Mbps. DS-3, thesignal in the T-3 carrier, carries a multiple of 28 DS1 signals or 672 DS0s or 44.736Mbps. Digital signal X is based on the American National Standards Institute T1.107guidelines.

E1 (or E-1) is a European digital transmission format devised by the ITU-TS and giventhe name by the Con­ference of European Postal and Telecommunication Administration(CEPT). It's the equivalent of the North American T-carrier system format. E2 throughE5 are carriers in increasing multiples of the E1 format. The E1 signal format carriesdata at a rate of 2.048 million bits per second and can carry 32 channels of 64 Kbpseach. E1 carries at a somewhat higher data rate than T-1 (which carries 1.544 millionbits per second) because, unlike T-1, it does not do bit-robbing and all eight bitsper channel are used to code the signal. E1 and T-1 can be interconnected for internationaluse.

E-2 is a line that carries four multiplexed E1 signals with a data rate of 8.448million bits per second.

E3 (or E-3) carries 16 E1 signals with a data rate of 34.368 million bits per second.

Expansion archangel

A physical interface specified by the EIA. EIA-232 transmits and receives asynchronousdata at speeds of up to 19.2 kbps over cable distances of up to 50 feet. EIA-232replaces RS-232 protocol in some MultiVantage applications.

electronic tandem network (ETN)
A tandem tie-trunk network that has automatic call-routing capabilities based onthe number dialed and the most preferred route available. Each switch in the networkis assigned a unique private network office code (RNX), and each voice terminal isassigned a unique extension.

Electromagnetic Interference; Class A is typically required for business, Class Bfor residence.

end-to-end signaling
The transmission of touch-tone signals generated by dialing from a voice terminalto remote computer equip­ment. These digits are sent over the trunk as DTMF digitswhether the trunk signaling type is marked as tone or rotary and whether the originatingstation is tone or rotary. Example: a call to a voice-mail machine or automated-attendantservice. A connection is first established over an outgoing trunk. Then additionaldigits are dialed to transmit information to be processed by the computer equipment.

enhanced private-switched communications service (EPSCS)
An analog private telecommunications network based on the No. 5 crossbar and 1A ESSthat provides advanced voice and data telecommunications services to companies withmany locations.

ephemeral termination
In H.248 signaling, an ephemeral termination is used for an IP connection. For example,a connection between an analog phone and an IP telephone would be described by anH.248 context with two termina­tions, a physical termination for the analog phone(which corresponds to a physical port) and an ephemeral termination for the IP telephone.The ephemeral termination includes additional information describing the IP sideof the call, i.e. the codec chosen, the near end and far end IP addresses and ports,silence suppression information, frame rate (samples per IP packet), etc.

Ethernet L2 Switch
In the Avaya™ G700 Media Gateway and in the Avaya™ stackable switch/router family,this consists of one or more 8 port, wire-speed ASIC devices called Timpani.

Ethernet Switch
A network-control microprocessor located on an expansion interface (EI) port circuitpack in an expansion port network. The EA provides an interface between the EPN andits controlling switch-processing element.

expansion-archangel link (EAL)
A link-access function on the D-channel (LAPD) logical link that exists between aswitch-processing ele­ment and an expansion archangel (EA). The EAL carries controlmessages from the SPE to the EA and to port circuit packs in an expansion port network.

expansion archangel (EAA)
expansion control carrier

expansion interface (EI)
A port circuit pack in a port network that provides the interface between a PN'sTDM bus/ packet bus and a fiber-optic link. The EI carries circuit-switched data,packet-switched data, network control, timing control, and DS1 control. In addition,an EI in an expansion port network communicates with the master maintenance circuitpack to provide the EPN's environmental and alarm status to the switch-processingelement.

expansion port network (EPN)
In DEFINITY server configurations, a port network (PN) that is connected to the TDMbus and packet bus of a processor port network (PPN). Control is achieved by indirectconnection of the EPN to the PPN via a port-network link (PNL).

Expert Agent Selection (EAS)
A feature allowing incoming calls to be routed to specialized groups of agents withina larger pool of agents.

A 1- to 5-digit number by which calls are routed through a communications systemor, with a Uniform Dial Plan (UDP) or main-satellite dialing plan, through a privatenetwork.

external media server (EMS)
An external server running the Avaya MultiVantage™ application, i.e. Avaya™ S8700Media Server, con­trolling Avaya™ G700 Media Gateways.

A trunk allocation term. In the flexible allocation scheme, the time slots of a widebandcall can occupy non­contiguous positions within a single T1 or E1 facility.

An area code other than the local area code, that must be dialed to call outsidethe local geographical area.

foreign numbering-plan area code (FNPAC)

A (mu-law or a-law, 64Kbps) codec.

A (6.3Kbps or 5.3Kbps audio) codec.

A (8Kbps audio) codec.

GateKeeper is a term specifically defined by the H.323 standard which describes theentity performing most of the authorization, routing, and feature functionality inan H.323 system.

generalized route selection (GRS)
An enhancement to Automatic Alternate Routing/Automatic Route Selection (AAR/ARS)that performs routing based on call attributes, such as Bearer Capability Classes(BCCs), in addition to the address and facilities restriction level (FRL), thus facilitatinga Uniform Dial Plan (UDP) that is independent of the type of call being placed.

The simultaneous seizure of a 2-way trunk by two communications systems, resultingin a standoff.

ground-start trunk
A trunk on which, for outgoing calls, the system transmits a request for servicesto a distant switching system by grounding the trunk ring lead. To receive the digitsof the called number, that system grounds the trunk tip lead. When the system detectsthis ground, the digits are sent.

ITU standard for switched multimedia communication between a LAN-based multimediaendpoint and a gatekeeper.

An ISDN information transfer rate for 1536-kbps data defined by CCITT and ANSI standards.

An ISDN information transfer rate for 1920-kbps data defined by CCITT and ANSI standards.

High-speed memory section that holds blocks of data the CPU is currently working

The local area code. The area code does not have to be dialed to call numbers withinthe local geographical area.

A proprietary interface used for the DEFINITY Wireless Business System for the radio-controllercircuit packs. Each interface provides communication between the radio-controllercircuit pack and up to two wire­less fixed bases.

I3 Interface
A proprietary interface used for the DEFINITY Wireless Business System for the cellantenna units. Each wireless fixed base can communicate to up to four cell antennaunits.

immediate-start tie trunk
A trunk on which, after making a connection with a distant switching system for anoutgoing call, the system waits a nominal 65 ms before sending the digits of thecalled number. This allows time for the distant system to prepare to receive digits.On an incoming call, the system has less than 65 ms to prepare to receive the dig­its.I

In DEFINITY server configurations, a carrier in a multicarrier cabinet that contains

incoming gateway
A server that routes an incoming call on a trunk not administered for SupplementaryServices Protocol B to a trunk not administered for Supplementary Services ProtocolB.

information exchange
The exchange of data between users of two different systems, such as the switch anda host computer, over a LAN.

Information Systems Network (ISN)
A WAN and LAN with an open architecture combining host computers, minicomputers,word processors, storage devices, PCs, high-speed printers, and nonintelligent terminalsinto a single packet-switching system.

Initialization and Administration System (INADS)
A software tool used by Avaya Services personnel located at the Technical ServiceCenter (TSC) to initialize, administer, and troubleshoot customer communicationssystems remotely.

Integrated Services Digital Network (ISDN)
A public or private network that provides end-to-end digital communications for allservices to which users have access by a limited set of standard multipurpose user-networkinterfaces defined by the CCITT. Through internationally accepted standard interfaces,ISDN provides digital circuit-switched or packet-switched communications within thenetwork and links to other ISDNs to provide national and inter­national digital communications.See also Integrated Services Digital Network Basic Rate Interface (ISDN-BRI) andIntegrated Services Digital Network Primary Rate Interface (ISDN-PRI).

Integrated Services Digital Network Basic Rate Interface (ISDN-BRI)
The interface between a communications system and terminal that includes two 64-kbpsB-channels for transmitting voice or data and one 16-kbps D-channel for transmittingassociated B-channel call control and out-of-band signaling information. ISDN-BRIalso includes 48 kbps for transmitting framing and D-channel contention information,for a total interface speed of 192 kbps. ISDN-BRI serves ISDN terminals and digitalterminals fitted with ISDN terminal adapters. See also Integrated Services DigitalNetwork (ISDN) and Inte­grated Services Digital Network Primary Rate Interface (ISDN-PRI).

Integrated Services Digital Network Primary Rate Interface (ISDN-PRI)
The interface between multiple communications systems that in North America includes24 64-kbps chan­nels, corresponding to the North American digital signal level-1(DS1) standard rate of 1.544 Mbps. The most common arrangement of channels in ISDN-PRIis 23 64-kbps B-channels for transmitting voice and data and 1 64-kbps D-channelfor transmitting associated B-channel call control and out-of-band signaling information.With nonfacility-associated signaling (NFAS), ISDN-PRI can include 24 B-channelsand no D-channel. See also Integrated Services Digital Network (ISDN) and IntegratedServices Digital Network Basic Rate Interface (ISDN-BRI).

IP Media Processor (TN2302AP)
Circuit pack that provides VoIP (voice over internet protocol) audio access to theswitch for local stations and for outside trunks. It performs echo cancellation,silence suppression, fax relay service and DTMF detec­tion.

A version of Avaya Call Processing and INTUITY messaging running on an NT serverin a 4U high 19 rack mount configuration (data form factor). This configuration supportsstandard DEFINITY line cards and is driven by the same software as DEFINITY ONE.

IPSec (Internet Protocol Security) is a developing standard for security at the networkor packet processing layer of network communication. Earlier security approacheshave inserted security at the application layer of the communications model. IPSecwill be especially useful for implementing virtual private network and for remoteuser access through dial-up connection to private networks. A big advantage of IPSecis that secu­rity arrangements can be handled without requiring changes to individualuser computers. IPSec provides two choices of security service. Authentication Header(AH), which essentially allows authentication of the sender of data, and EncapsulatingSecurity Payload (ESP), which supports both authentication of the sender and encryptionof data as well. The specific information associated with each of these servicesis inserted into the packet in a header that follows the IP packet header. Separatekey protocols can be selected, such as the ISAKMP/Oakley protocol.

IP Server Interface circuit pack that provides for clock generation and synchronization,tone generation and detection, and Port Network AA functionality in S8700 Media Serverconfigurations.

Layer 2 Switch
An IP component, which takes packets and streams and statically reroutes them toanother port on the layer two switch based on the destination MAC address.

Layer 3 Switch
An IP component, which takes packets and streams and dynamically reroutes them toanother port on the layer three switch based on the IP address of the packet or stream.IP Routering is a layer-3 functionality.

light-emitting diode
A semiconductor device that produces light when voltage is applied. LEDs providea visual indication of the operational status of hardware components, the resultsof maintenance tests, the alarm status of circuit packs, and the activation of telephonefeatures.

lightwave transceiver
Hardware that provides an interface to fiber-optic cable from port circuit packsand DS1 converter circuit packs. Lightwave transceivers convert electrical signalsto light signals and vice versa.

line buildout
A selectable output attenuation is generally required of DTE equipment because T1circuits require the last span to lose 15-22.5 dB.

line gateway
An Avaya™ G700 Media Gateway without any IP phones.

link-access procedure on the D-channel (LAPD)
A link-layer protocol on the ISDN-BRI and ISDN-PRI data-link layer (level 2). LAPDprovides data transfer between two devices, and error and flow control on multiplelogical links. LAPD is used for signaling and low-speed packet data (X.25 and mode3) on the signaling (D-) channel and for mode-3 data communica­tions on a bearer(B-) channel.

local survivable processor (LSP)
A configuration of the S8300 Media Server used to provide redundancy of the AvayaMultiVantage™ appli­cation. In the LSP configuration, the server acts as an alternateserver/gatekeeper for IP entities such as IP telephones and Avaya™ G700 Media Gateways.These IP entities will use the LSP when they lose connec­tivity to their primaryserver.

logical link
The communications path between a processor and a BRI terminal.

loop-start trunk
A trunk on which, after establishing a connection with a distant switching systemfor an outgoing call, the system waits for a signal on the loop formed by the trunkleads before sending the digits of the called num­ber.

Leave Word Calling

Media Access Control. A general reference to the low-level hardware protocols usedto access a particular network. The term MAC address is often used as a synonym forphysical address.

main distribution frame (MDF)
A device that mounts to the wall inside the system equipment room. The MDF providesa connection point from outside telephone lines to the PBX switch and to the insidetelephone stations.

major alarm
An indication of a failure that has caused critical degradation of service and requiresimmediate attention. Major alarms are automatically displayed on LEDs on the attendantconsole and maintenance or alarming circuit pack, logged to the alarm log, and reportedto a remote maintenance facility, if applicable.

management terminal
The terminal that is used by the system administrator to administer the switch. Theterminal may also be used to access the BCMS feature.

MCC1 Media Gateway
An Avaya Media Gateway that holds one to five carriers. See Avaya™ Media Gateway.

media module
In Avaya™ G700, this refers to a removable, hot-pluggable circuit pack that can beinserted into one of four slots on the G700 box. They are approximately 6.25 x 11.00inches in size, and interface to the buses on the G700 motherboard.

media module slots
In Avaya™ G700, this refers to a removable, hot-pluggable circuit pack that can beinserted into one of four slots on the G700 box. They are approximately 6.25 x 11.00inches in size, and interface to the buses on the G700 motherboard.

media processor
The circuit pack than handles voice processing for voice over IP.

Media Gateway Control Protocol, a protocol designed for use by Gatekeepers to controlGateways. In the IETF, it was superseded by the Megaco protocol, which was unifiedwith the ITU's H.248 (formerly H.gcp).

minor alarm
An indication of a failure that could affect customer service. Minor alarms are automaticallydisplayed on LEDs on the attendant console and maintenance or alarming circuit pack,sent to the alarm log, and reported to a remote maintenance facility, if applicable.

modem pooling
A capability that provides shared conversion resources (modems and data modules)for cost-effective access to analog facilities by data terminals. When needed, modempooling inserts a conversion resource into the path of a data call. Modem poolingserves both outgoing and incoming calls.

modular processor data module (MPDM)
A processor data module (PDM) that can be configured to provide several kinds ofinterfaces (RS-232C, RS-449, and V.35) to customer-provided data terminal equipment(DTE). See also processor data module (PDM).

multiappearance voice terminal
A terminal equipped with several call-appearance buttons for the same extension,allowing the user to handle more than one call on that same extension at the sametime.

Multifrequency Compelled (MFC) Release 2 (R2) signaling
A signal consisting of two frequency components, such that when a signal is transmittedfrom a switch, another signal acknowledging the transmitted signal is received bythe switch. R2 designates signaling used in the United States and in countries outsidethe United States.

network-specific facility (NSF)
An information element in an ISDN-PRI message that specifies which public-networkservice is used. NSF applies only when Call-by-Call Service Selection is used toaccess a public-network service.

network region
A collection of IP endpoints and switch IP interfaces interconnected by an IP network,such that IP intercon­nection of endpoints and switch interfaces is lessexpensive(or provides better performance) than intercon­nections between members of differentregions.

The Synchronous Optical Network (Synchronous Optical Network) includes a set of signalrate multiples for transmitting digital signals on optical fiber. The base rate (OC-1)is 51.84 Mbps. OC-2 runs at twice the base rate, OC-3 at three times the base rate,and so forth. Planned rates include OC-1, OC-3 (155.52 Mbps), OC-12 (622.08 Mbps),and OC-48 (2.488 Gbps). Asynchronous transfer mode makes use of some of the OpticalCarrier levels.

Outbound Call Management

One of four agent work modes: the mode in which an

Peripheral Component Interconnect. A local bus technology that allows SCSI host adapters,video cards, and other peripherals to send data directly to and receive data directlyfrom the CPU.

Personal central-office line group

Processing element

Phantom Calls
A feature that allows a call to originate either from a station AWOH or from a non-huntgroup made up of AWOH stations.

port network (PN)
A cabinet containing a TDM bus and packet bus to which the following components maybe connected: port circuit packs, control circuit packs, service circuit packs, andpower converter circuit packs. Each PN is con­trolled either locally or remotelyby a switch processing element (SPE).port-

PRI endpoint (PE)
The wideband switching capability introduces PRI endpoints on switch line-side interfaces.A PRI endpoint consists of one or more contiguous B-channels on a line-side T1 orE1 ISDN PRI facility and has an exten­sion. Endpoint applications have call-controlcapabilities over PRI endpoints.

Primary extension
The main extension associated with the physical voice or data terminal.

Primary Rate Interface (PRI)
A standard ISDN frame format that specifies the protocol used between two or morecommunications sys­tems. PRI runs at 1.544 Mbps and, as used in North America, provides23 64-kbps B-channels (voice or data) and one 64-kbps D-channel (signaling). The D-channel is the 24th channel of the interface and contains mul­tiplexed signalinginformation for the other 23 channels.

A terminal that has its primary extension bridged on one or more other terminals.

principal (user)
A person to whom a telephone is assigned and who has message-center coverage.

private network
A network used exclusively for the telecommunications needs of a particular customer.

private network office code (RNX)
The first three digits of a 7-digit private network number.

processor port network (PPN)
In DEFINITY server configurations, a port network controlled by a switch-processingelement that is directly connected to that PN's TDM bus and LAN bus. See also portnetwork (PN).

processor port network (PPN) control carrier
In DEFINITY server configurations, a carrier containing the maintenance circuit pack,tone/clock circuit pack, and SPE circuit packs for a processor port network (PPN)and, optionally, port circuit packs.

Rack-mountable housing for circuit packs, media modules and other media gateway components.

RADIUS (Remote Authentication Dial-In User Service) is a client/server protocol andsoftware that enables remote access servers to communicate with a central serverto authenticate dial-in users and authorize their access to the requested systemor service. RADIUS allows a company to maintain user profiles in a central databasethat all remote servers can share. It provides better security, allowing a companyto set up a policy that can be applied at a single administered network point. Havinga central service also means that it's easier to track usage for billing and forkeeping network statistics.

redirection criteria
Information administered for each voice terminal's coverage path that determineswhen an incoming call is redirected to coverage.

Redirection on No Answer
An optional feature that redirects an unanswered ringing ACD call after an administerednumber of rings. The call is then redirected back to the agent.

release signal
The signal one switch sends to another to disconnect a call. If the calling switchends the call, it sends a for­ward release signal. If the receiving switch ends thecall, it sends a backward release signal.

remote home numbering-plan area code (RHNPA)
A foreign numbering-plan area code that is treated as a home area code by the AutomaticRoute Selection (ARS) feature. Calls can be allowed or denied based on the area codeand the dialed CO code rather than just the area code. If the call is allowed, theARS pattern used for the call is determined by these six digits.

Remote Operations Service Element (ROSE)
A CCITT and ISO standard that defines a notation and services that support interactionsbetween the various entities that make up a distributed application.

reorder tone
A tone to signal that at least one of the facilities, such as a trunk or a digittransmitter, needed for the call was not available.

Resource Reservation Protocol (RSVP)
A protocol that allows channels or paths on the Internet to be reserved for the multicast(one source to many receivers) transmission of video and other high-bandwidth messages.RSVP is part of the Internet Integrated Service (IIS) model, which ensures. best-effortservice, real-time service, and controlled link sharing. The basic routing philosophyon the Internet is best-effort, which serves most users well enough but isn't ade­quatefor the continuous stream transmission required for video and audio programs overthe Internet. With RSVP, people who want to receive a particular Internet program(think of a television program broadcast over the Internet) can reserve bandwidththrough the Internet in advance of the program and be able to receive it at a higherdata rate and in a more dependable data flow than usual. When the program starts,it will be multicast to those specific users who have reserved routing priority inadvance. RSVP also supports uni­cast (one source to one destination) and multi-sourceto one destination transmissions.

RMON (Remote Monitoring)
A standard monitoring specification for shared Ethernet and Tokenring media definedin RFC 1757. RMON enables various network monitors and console systems to exchangenetwork-monitoring data. The RMON specification defines a set of statistics and functionsthat can be exchanged between RMON-compliant con­sole managers and network probes.As such, RMON provides network administrators with comprehensive network-fault diagnosis,planning, and performance-tuning information. RMON has two levels.    n    RMON-I analyzes the MAC layer    n    RMON-II analyzes the upper layers (layer 3 and above)

A device that supports LAN-to-LAN communications. Routers may be equipped to provideframe relay sup­port to the LAN devices they serve. A frame-relay-capable routerencapsulates LAN frames in frame relay frames and feeds those frame relay framesto a frame relay switch for transmission across the network. A frame-relay-capablerouter also receives frame relay frames from the network, strips the frame relayframe off each frame to product the original LAN frame, and passes the LAN frameon to the end device. Routers connect multiple LAN segments to each other or to aWAN. Routers route traffic on the Level 3 LAN proto­col (e.g., the Internet Protocoladdress). See also Bridge.

A physical interface specified by the Electronic Industries Association (EIA). RS-232Ctransmits and receives asynchronous data at speeds of up to 19.2 kbps over cabledistances of up to 50 feet.

The first logical signalling channel of DCP. The channel is used to provide signalinginformation for DCP's I1 channel.

The second logical signaling channel of DCP. The channel is used to provide signalinginformation for DCP's I2 channel.

sanity and control interface
A custom VLSI microchip located on each port circuit pack. The SAKI provides addressrecognition, buffer­ing, and synchronization between the angel and the five controltime slots that make up the control channel. The SAKI also scans and collects statusinformation for the angel on its port circuit pack and, when polled, transmits thisinformation to the archangel.sanity and control interface

SCC1 Media Gateway. Avaya Media Gateway with a single carrier. See Avaya™ Media Gateway.

Service Level Agreement (SLA)
A contract between a network service provider and a customer that specifies, usuallyin measurable terms, what services the network service provider will furnish. ManyInternet service providers (Internet service provider) provide their customers withan SLA. More recently, IS departments in major enterprises have adopted the ideaof writing a Service Level Agreement so that services for their customers (usersin other departments within the enterprise) can be measured, justified, and perhapscompared with those of outsourc­ing network providers. Some metrics that SLAs mayspecify include:   n    What percentage of the time services will be available   n    The number of users that can be served simultaneously    n    Specific performance benchmark to which actual performance will be periodicallycompared

single-line voice terminal
A voice terminal served by a single-line tip and ring circuit (models 500, 2500,7101A, 7103A).

SMON (Switched Monitoring)
Technology which is an extension of RMON Standard. SMON adds to the RMON capabilities in following ways. Device SMON is an extension of RMON-I that provides additional tools and features for monitoring in a local switch environment. AnyLayer SMON extendsRMON-II that provides a global view of traffic flow in a network with multiple switches.SMON collects and displays data in Real time. SMON is capable of providing.

System Management Terminal. An administration device for System 85 which is similarto the MAAP. The SMT provides limited administration capability to the customer.

Simple Network Management Protocol (SNMP, IETF STD 15 (RFC 1157) and RFCs 1441, 1905and 1906) is the industry standard protocol governing network management and themonitoring of network devices and their functions. It is not necessarily limitedto TCP/IP networks.

split (agent) status report
A report that provides real-time status and measurement data for internally measuredagents and the split to which they are assigned.

Stratum 3 clock board

standard serial interface (SSI)
A communications protocol developed for use with 500-type business communicationsterminals (BCTs) and 400-series printers.

Station Message Detail Recording
An obsolete term now called CDR - a switch feature that uses software and hardwareto record call data. See Call Detail Recording (CDR).

status lamp
A green light that shows the status of a call appearance or a feature button by thestate of the light (lit, flash­ing, fluttering, broken flutter, or unlit).

survivable CC
Another name for a Local Survivable Processor.

Any kind of telephone switching system. See also communications system.

switch-node (SN) carrier
A carrier containing a single switch node, power units, and, optionally, one or twoDS1 converter circuit packs. An SN carrier is located in a center-stage switch.

switch-node (SN) clock
The circuit pack in an SN carrier that provides clock and maintenance alarm functionsand environmental monitors.

switch-node interface (SNI)
The basic building block of a switch node. An SNI circuit pack controls the routingof circuit, packet, and control messages.

switch-node link (SNL)
The hardware that provides a bridge between two or more switch nodes. The SNL consistsof the two SNI circuit packs residing on the switch nodes and the hardware connectingthe SNIs. This hardware can include lightwave transceivers that convert the SNI'selectrical signals to light signals, the copper wire that connects the SNIs to thelightwave transceivers, a full-duplex fiber-optic cable, DS1 converter circuit cardsand DS1 facilities if a company does not have rights to lay cable, and appropriateconnectors.

Switch Processing Element
Switch Processing Element. The control complex that operates the system. In DEFINITYservers, it includes all control circuit packs. Other configurations place some ofthe SPE functions in other components of the control network such as servers andethernet switches.

synchronous data transmission
A method of sending data in which discrete signal elements are sent at a fixed andcontinuous rate and spec­ified times. See also association.

System Access Terminal (SAT)
Interface into the DEFINITY server and media server configurations for administrativeand maintenance functions.

system administrator
The person who maintains overall customer responsibility for system administration.Generally, all adminis­tration functions are performed from the Management Terminal.The switch requires a special login, referred to as the system administrator login,to gain access to system-administration capabilities.

system report
A report that provides historical traffic information for internally measured splits.

The T1 (or T-1) carrier is the most commonly used digital line in the United States,Canada, and Japan. In these countries, it carries 24 pulse code modulation (pulsecode modulation) signals using Time-Division Multiplexing at an overall rate of 1.544megabit per second.

44.736 Mbps

Trunk Answer from Any Station

tandem switch
A switch within an electronic tandem network (ETN) that provides the logic to determinethe best route for a network call, possibly modifies the digits outpulsed, and allowsor denies certain calls to certain users.

tandem tie-trunk network (TTTN)
A private network that interconnects several customer switching systems.

Transmission Control Protocol, a connection-oriented transport-layer protocol, IETFSTD 7. RFC 793. Whereas the IP protocol deals only with packets, TCP enables twohosts to establish a connection and exchange streams of data. TCP guarantees deliveryof data and also guarantees that packets will be delivered in the same order in whichthey were sent.

tie trunk
A telecommunications channel that directly connects two private switching systems.

time-division multiplex (TDM) bus
A bus that is time-shared regularly by preallocating short time slots to each transmitter.In a PBX, all port cir­cuits are connected to the TDM bus, permitting any port tosend a signal to any other port.

time interval
The period of time, either one hour or one-half hour, that BCMS measurements arecollected for a reports.

time slot
64 kbps of digital information structured as eight bits every 125 microseconds. Inthe switch, a time slot refers to either a DS0 on a T1 or E1 facility or a 64-kbpsunit on the TDM bus or fiber connection between port networks.

time slot sequence integrity
The situation whereby the N octets of a wideband call that are transmitted in oneT1 or E1 frame arrive at the output in the same order that they were introduced.

trunk-data module
A device that connects off-premises private-line trunk facilities and DEFINITY ECS.The trunk-data module converts between the RS-232C and the DCP, and can connect toDDD modems as the DCP member of a modem pool.

trunk group
Telecommunications channels assigned as a group for certain functions that can beused interchangeably between two communications systems or COs.

Relative to the Internet, tunneling is using the Internet as part of a private securenetwork. The tunnel is the particular path that a given company message or file mighttravel through the Internet.

The trunk interface between a network access device and a packet network at datarates greater than 19.2 Kbps. V.35 may use the bandwidths of several telephone circuitsas a group.

vector-controlled split
A hunt group or ACD split administered with the vector field enabled. Access to sucha split is possible only by dialing a VDN extension.

vector directory number
An extension that provides access to the Vectoring feature on the switch. Vectoringallows a customer to specify the treatment of incoming calls based on the dialednumber.

Virtual LAN, a term used for networks whose traffic can be segregated independentof physical LAN con­nectivity. 802.1Q framing can support VLAN operation.

VoIP (voice over IP - that is, voice delivered using the Internet Protocol)
A term used in IP telephony for a set of facilities for managing the delivery ofvoice information using the Internet Protocol (IP). In general, this means sendingvoice information in digital form in discrete packet rather than in the traditionalcircuit-committed protocols of the public switched telephone network (public switchedtelephone network). A major advantage of VoIP and Internet telephony is that it avoidsthe tolls charged by ordinary telephone service.

VoIP Monitoring Manager
VoIP Monitoring Manager adds to the RMON/SMON capabilities for VoIP call level monitoring.VoIP Mon­itoring Manager is capable of displaying both Real time data as well ashistorical data.

A virtual private network (VPN) is a private data network that makes use of the publictelecommunication infrastructure, maintaining privacy through the use of a tunneling protocol and security procedures. A virtual private network can be contrasted witha  system of owned or leased lines that can only be used by one com­pany. The ideaof the VPN is to give the company the same capabilities at much lower cost by usingthe shared public infrastructure rather than a private one. Phone companies haveprovided secure shared resources for voice messages. A virtual private network makesit possible to have the same secure sharing of public resources for data. Companiestoday are looking at using a private virtual network for both extranet and wide-areaintranet. Using a virtual private network involves encrypting data before sendingit through the public network and decrypting it at the receiving end. An additionallevel of security involves encrypting not only the data but also the originatingand receiving network addresses. VPN software is typically installed as part of acompany's firewall server.

A circuit-switched call at a data rate greater than 64 kbps. A circuit-switched callon a single T1 or E1 facil­ity with a bandwidth between 128 and 1536 (T1) or 1984(E1) kbps in multiples of 64 kbps. H0, H11, H12, and N x DS0 calls are wideband.

wideband access endpoint

wink-start tie trunk
A trunk with which, after making a connection with a distant switching system foran outgoing call, the sys­tem waits for a momentary signal (wink) before sendingthe digits of the called number. Similarly, on an incoming call, the system sendsthe wink signal when ready to receive digits.

work mode
One of four states (Auto-In, Manual-In, ACW, AUX-Work) that an ACD agent can be in.Upon logging in, an agent enters AUX-Work mode. To become available to receive ACDcalls, the agent enters Auto-In or Manual-In mode. To do work associated with a completedACD call, an agent enters ACW mode.

work state
An ACD agent may be a member of up to three different splits. Each ACD agent continuouslyexhibits a work state for every split of which it is a member. Valid work statesare Avail, Unstaffed, AUX-Work, ACW, ACD (answering an ACD call), ExtIn, ExtOut,and OtherSpl. An agent's work state for a particular split may change for a varietyof reasons (example: when a call is answered or abandoned, or the agent changes workmodes). The BCMS feature monitors work states and uses this information to provideBCMS reports.

WSP (WAN Spare Processor)
A redundancy configuration that provides service to elements in a MultiVantage solutionsnetwork across an ATM infrastructure. WSPs may be placed in various places in thecustomer's network to provide reliable ser­vice in cases where the ATM network fails.

Wireless Subscriber System