Lucent Technologies DEFINITY Business Communications System And GuestWorks Instructions Manual

							DEFINITY® Business Communications System and GuestWorks® Issue 6 
Overview  555-231-208  Issue 1
April 2000
Glossary and Abbreviations 
GL-3  
ARS
See Automatic Route Selection (ARS)
.
ASCII (American Standard Code for Information Interchange)
The standard code for representing characters in digital form. Each character is represented by an 
8-bit code (including parity bit).
asynchronous data transmission
A method of transmitting data in which each character is preceded by a start bit and followed by a 
stop bit, thus permitting data characters to be transmitted at irregular intervals. This type of 
transmission is advantageous when transmission is not 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.
attendant
A person who uses a console to provide personalized service for incoming callers and 
voice-services users by performing switching and signaling operations. See also attendant console
.
attendant console
The workstation used by an attendant. The attendant console allows the attendant to originate a 
call, answer an incoming call, transfer a call to another extension or trunk, put a call on hold, and 
remove a call from hold. Attendants using the console can also manage and monitor some system 
operations. Also called console. See also attendant
.
Audio Information Exchange (AUDIX)
A fully integrated voice-mail system. Can be used with a variety of communications systems 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. When a CO seizes a 
trunk from an auto-in trunk group, the switch automatically connects the 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 their calls arrive.
Auto-In Work mode
One of four 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 Callback (ACB)
A feature that enables internal callers, upon reaching a busy extension, to have the system 
automatically connect and ring both parties when the called party becomes available.
Automatic Call Distribution (ACD)
A feature that answers calls, and then, depending on administered instructions, delivers messages 
appropriate for the caller and routes the call to an agent when an agent becomes available.
Automatic Call Distribution (ACD) Split
A method of routing calls of a similar type among agents in a split. Also, a group of extensions that 
are staffed by agents trained to handle a certain type of incoming call.
Automatic Calling Unit (ACU)
A device that places a telephone call. 
						

							DEFINITY® Business Communications System and GuestWorks® Issue 6 
Overview  555-231-208  Issue 1
April 2000
Glossary and Abbreviations 
GL-4  
Automatic Circuit Assurance (ACA)
A feature that tracks calls of unusual duration to facilitate troubleshooting. A high number of very 
short calls or a low number of very long calls may signify a faulty trunk.
Automatic Number Identification (ANI)
Representation of the calling number, for display or for further use to access information about the 
caller. Available with Signaling System 7.
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/or communications 
equipment). Restoration is done within seconds of a service disruption so 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.
automatic trunk
A trunk that does not require addressing information because the destination is predetermined. A 
request for service on the trunk, called a seizure, is sufficient to route the call. The normal 
destination of an automatic trunk is the communications-system attendant group. Also called 
automatic incoming trunk and automatic tie trunk.
AUX
Auxiliary
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 a communications 
system.
Aux-Work mode
A work mode in which agents are unavailable to receive ACD calls. Agents enter Aux-Work mode 
when involved in non-ACD activities such as taking a break, going to lunch, or placing an outgoing 
call.
AV D
Alternate voice/data
AW O H
See Administration Without Hardware (AWOH)
.
AW G
American Wire Gauge
AW T
Average work time
B
bandwidth
The difference, expressed in hertz, between the defined highest and lowest frequencies in a range. 
						

							DEFINITY® Business Communications System and GuestWorks® Issue 6 
Overview  555-231-208  Issue 1
April 2000
Glossary and Abbreviations 
GL-5  
baud
A unit of transmission rate equal to the number of signal events per second. See also bit rate
 and 
bits per second (bps)
.
BCC
See Bearer capability class (BCC)
.
BCMS
Basic Call Management System
Bearer capability class (BCC)
A code that identifies the type of a call (for example, voice and different types of data). 
Determination of BCC is based on the caller’s characteristics for non-ISDN endpoints and on the 
Bearer Capability and Low-Layer Compatibility Information Elements of an ISDN endpoint. Current 
BCCs are 0 (voice-grade data and voice), 1 (56 kbps data transmission), 2 
(synchronous/asynchronous data transmission up to 19.2 kbps) 3 (64 kbps circuit/packet data 
transmission), 4 (64 kbps synchronous data), 5 (temporary signaling connection, and 6 (wideband 
call, 128–1984 kbps synchronous data; not supported by this system).
bit (binary digit)
One unit of information in binary notation, having two possible values: 0 or 1.
bits per second (bps)
The number of binary units of information that are transmitted or received per second. See also 
baud
 and bit rate.
bit rate
The speed at which bits are transmitted, usually expressed in bits per second. Also called data rate. 
See also baud
 and bits per second (bps).
BLF
Busy Lamp Field
BPN
Billed-party number
bps
See bits per second (bps)
.
bridge (bridging)
The appearance of a telephone’s extension at one or more other telephone.
BRI
The ISDN Basic Rate Interface specification.
bridged appearance
A call appearance on a telephone that matches a call appearance on another telephone for the 
duration of a call.
buffer
1. In hardware, a circuit or component that isolates one electrical circuit from another. Typically, a 
buffer holds data from one circuit or process until another circuit or process is ready to accept the 
data.
2. In software, an area of memory that is used for temporary storage.
bus
A multiconductor electrical path used to transfer information over a common connection from any of 
several sources to any of several destinations. 
						

							DEFINITY® Business Communications System and GuestWorks® Issue 6 
Overview  555-231-208  Issue 1
April 2000
Glossary and Abbreviations 
GL-6  
busy tone
A low-pitched repeating tone that indicates the dialed number is in use.
BX.25
A version of the CCITT X.25 protocol for data communications. BX.25 adds a fourth level to the 
standard X.25 interface. This uppermost level combines levels 4, 5, and 6 of the ISO reference 
model.
bypass tie trunks
A one-way, outgoing tie trunk from a tandem switch to a main switch in an ETN. Bypass tie trunks, 
provided in limited quantities, are used as a last-choice route when all trunks to another tandem 
switch are busy. Bypass tie trunks are used only if all applicable intertandem trunks are busy.
byte
A sequence of (usually eight) bits processed together.
C
cabinet
Housing for racks, shelves, or carriers that hold electronic equipment.
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 a telephone, a button labeled with an extension and used to place outgoing calls, receive 
incoming calls, or hold calls. Two lights next to the button show the 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.
callback call
A call that automatically returns to a user’s telephone who activated the Automatic Callback or 
Ringback Queuing feature.
Call Vectoring directory number
An extension that provides access to the Call Vectoring feature on the switch. Call Vectoring allows 
a customer to specify the treatment of incoming calls based on the dialed number.
call-waiting ringback tone
A low-pitched tone identical to ringback tone except that the tone decreases in the last 0.2 seconds 
(in the United States). Call-waiting ringback tone notifies the attendant that Attendant Call Waiting is 
active and that the called party is aware of the waiting call. Tones in international countries may 
sound different.
call-waiting tone
One, two, or three beeps (short bursts of high-pitched tone) that indicate to a busy single-line 
telephone that an incoming call is waiting. The type of incoming call determines the number of 
beeps the busy telephone receives: one beep indicates that the call is from another telephone in the 
system, two beeps indicate that the call is from the attendant or an outside caller, and three beeps 
indicate that the waiting call is a priority call.
CAMA
Centralized Automatic Message Accounting 
						

							DEFINITY® Business Communications System and GuestWorks® Issue 6 
Overview  555-231-208  Issue 1
April 2000
Glossary and Abbreviations 
GL-7  
carrier
An enclosed shelf containing vertical slots that hold circuit packs.
carried load
The amount of traffic served by traffic-sensitive facilities during a given interval.
CAS
Call Accounting System
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 letter C. The abbreviation for call seconds is CS. 
Therefore, 100 call seconds is abbreviated CCS. If a facility is busy for an entire hour, then it is said 
to have been busy for 36 CCS. See also Erlang
.
capability
A request or indication of an operation. For example, 
Third Party Make Call is a request for setting 
up a call; 
event report is an indication that an event has occurred.
capability group
A set of capabilities, determined by switch administration, that can be requested by an application. 
Capability groups denote association types. For example, 
Call Control is a type of association that 
allows certain functions (the ones in the capability group) to be performed over this type of 
association. Also referred to as administration groups or application service elements (ASEs). 
CCIS
Common-Channel Interoffice Signaling
CCITT
CCITT (Comitte Consultatif International Telephonique et Telegraphique), now called 
International 
Telecommunications Union
 (ITU). See International Telecommunications Union (ITU).
CCS
Centum Call Seconds (CCS or hundred call seconds
).
CCSA
Common-Control Switching Arrangement
CDM
Channel-division multiplexing
CDR
See Call Detail Recording (CDR)
.
CDRP
Call Detail Record Poller
CDRR
Call Detail Recording and Reporting
CDRU
See Call Detail Recording utility (CDRU)
.
CEM
Channel-expansion multiplexing 
						

							DEFINITY® Business Communications System and GuestWorks® Issue 6 
Overview  555-231-208  Issue 1
April 2000
Glossary and Abbreviations 
GL-8  
Center-Stage Switch
The Center-Stage Switch is a connection hub that provides port network communication. It is an 
essential component of a system configuration if the system is composed of more than three port 
networks.
central office (CO)
The location housing telephone switching equipment that provides local telephone service and 
access to toll facilities for long-distance calling.
central office (CO) codes
The first three digits of a seven-digit public-network telephone number in the United States.
central office (CO) trunk
A telecommunications channel that provides access from the system to the public network through 
the local CO.
CEPT1
European Conference of Postal and Telecommunications Rate 1
channel
1. A circuit-switched call.
2. A communications path for transmitting voice and data.
3. A DS0 on a T1 or E1 facility not specifically associated with a logical circuit-switched call; 
analogous to a single trunk.
channel negotiation
The process by which the channel offered in the Channel Identification Information Element (CIIE) 
in the SETUP message is negotiated to be another channel acceptable to the switch that receives 
the SETUP message and ultimately to the switch that sent the SETUP. Negotiation is attempted 
only if the CIIE is encoded as 
Preferred.
circuit pack
A board on which electrical circuits are printed, and IC chips and electrical components are 
installed. A circuit pack is installed in a switch carrier.
CISPR
International Special Committee on Radio Interference
Class of Restriction (COR)
A feature that allows up to 95 classes of call-origination and call-termination restrictions for 
telephones, telephone groups, data modules, and trunk groups. See also Class of Service (COS)
.
Class of Service (COS)
A feature that uses a number to specify if telephone users can activate the Automatic Callback, Call 
Forwarding All Calls, Data Privacy, or Priority Calling features. See also Class of Restriction (COR)
.
CO
See central office (CO)
.
common-control switching arrangement (CCSA)
A private telecommunications network using dedicated trunks and a shared switching center for 
interconnecting company locations.
communications system
The software-controlled processor complex that interprets dialing pulses, tones, and keyboard 
characters and makes the proper connections both within the system and external 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  
						

							DEFINITY® Business Communications System and GuestWorks® Issue 6 
Overview  555-231-208  Issue 1
April 2000
Glossary and Abbreviations 
GL-9  
voice and data communications services, including access to public and private networks, for 
telephones and data terminals on a customer’s premises. See also switch
.
companding
Compress + Expand. Compress the digital code prior to transmission, and expand the received 
code prior to reconstructing the analog signal. This is a nonlinear encoding technique to minimize 
data rate requirements yet preserve signal quality.
confirmation tone
Three short bursts of tone that confirms a feature activation, deactivation, or cancellation has been 
accepted. This tone also can indicate that an outgoing call from a single-line telephone was placed 
in a ringback queue.
connectivity
The connection of disparate devices within a single system.
console
See attendant console
.
contiguous
Adjacent DS0s within one T1 or E1 facility or adjacent TDM or fiber time slots. The first and last 
TDM bus, DS0, or fiber time slots are not considered contiguous (no wraparound). For an E1 facility 
with a D-channel, DS0s 15 and 17 are considered contiguous.
control cabinet
See control carrier
.
control carrier
A carrier in a multicarrier cabinet that contains the SPE circuit packs and, unlike an R5r control 
carrier, port circuit packs. Also called control cabinet in a single-carrier cabinet. See also 
switch-processing element (SPE)
.
controlled station
A station that is monitored and controlled via a domain-control association.
COR
See Class of Restriction (COR)
.
COS
See Class of Service (COS)
.
coverage answer group
A group of up to eight telephones that ring simultaneously when a call is redirected to 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 alternate answering 
position when certain coverage criteria are met.
coverage path
The order in which calls are redirected to alternate answering positions.
coverage point
An extension or attendant group, Call Vectoring directory number, or ACD split designated as an 
alternate answering position in a coverage path.
coverage tone
A long-burst of tone indicating to the calling party that a call to an extension is being answered at 
another extension by a covering user. 
						

							DEFINITY® Business Communications System and GuestWorks® Issue 6 
Overview  555-231-208  Issue 1
April 2000
Glossary and Abbreviations 
GL-10  
covering user
A person at a coverage point who answers a redirected call.
CP
Circuit pack
CPE
Customer-premises equipment
CPN
Called-party number
CSA
Canadian Safety Association
CSD
Customer-service document
CSSO
Customer Services Support Organization
D
DAC
1. Dial access code
2. See digital-to-analog converter (DAC)
.
data channel
A communications path between two points used to transmit digital signals.
data-communications equipment (DCE)
The equipment (usually a modem, data module, or packet assembler/disassembler) on the network 
side of a communications link that makes the binary serial data from the source or transmitter 
compatible with the communications channel.
data link
The configuration of physical facilities enabling end terminals to communicate directly with each 
other.
data module
An interconnection device between a BRI or DCP interface of the switch and data terminal 
equipment or data communications equipment.
data port
A point of access to a computer that uses trunks or lines for transmitting or receiving data.
data rate
See bit rate
.
data service unit (DSU)
A device that transmits digital data on transmission facilities.
data terminal
An input/output (I/O) device that has either switched or direct access to a host computer or to a 
processor interface. 
						

							DEFINITY® Business Communications System and GuestWorks® Issue 6 
Overview  555-231-208  Issue 1
April 2000
Glossary and Abbreviations 
GL-11  
data terminal equipment (DTE)
Equipment consisting of the endpoints in a connection over a data circuit. In a connection between 
a data terminal and host, the terminal, the host, and their associated modems or data modules 
make up the DTE. 
DC
Direct current
DCE
Data-communications equipment
D-channel backup
A type of backup used with Non-Facility Associated Signaling (NFAS). A primary D-channel 
provides signaling for an NFAS D-channel group (two or more PRI facilities). A second D-channel, 
on a separate PRI facility of the NFAS D-channel group, is designated as backup for the D-channel. 
Failure of the primary D-channel causes automatic transfer of call-control signaling to the backup 
D-channel. The backup becomes the primary D-channel. When the failed channel returns to 
service, it becomes the backup D-channel.
DCP
Digital Communications Protocol
DDC
Direct Department Calling
DDD
Direct Distance Dialing
delay-dial trunk
A trunk that allows dialing directly into a communications system (digits are received as they are 
dialed).
designated telephone
The specific telephone to which calls, originally directed to a certain extension, are redirected. 
Commonly used to mean the forwarded-to telephone when Call Forwarding All Calls is active.
dial tone
A continuous tone indicating that a user can dial a number or activate features.
dial-repeating trunks
A PBX tie trunk that is capable of handling PBX station-signaling information without attendant 
assistance.
dial-repeating tie trunk
A tie trunk that transmits called-party addressing information between two communications 
systems.
DID
Direct Inward Dialing
digit conversion
A process used to convert specific dialed numbers into other dialed numbers.
digital
The representation of information by discrete steps. See also analog
.
digital communications protocol (DCP)
A proprietary protocol used to transmit both digitized voice and digitized data over the same 
communications link. A DCP link is made up of two 64 kbps information (I-) channels and one 8 
kbps signaling (S-) channel. Digital Communications Protocol. The DCP protocol supports two  
						

							DEFINITY® Business Communications System and GuestWorks® Issue 6 
Overview  555-231-208  Issue 1
April 2000
Glossary and Abbreviations 
GL-12  
information-bearing channels, and thus two telephones/data modules. The I1 channel is the DCP 
channel assigned on the first page of the 8411 station form. The I2 channel is the DCP channel 
assigned on the analog adjunct page of the 8411 station form or on the data module page. 
The DCP protocol supports two information-bearing channels, and thus two telephones/data 
modules. The I1 channel is the DCP channel assigned on the first page of the 8411 station form. 
The I2 channel is the DCP channel assigned on the analog adjunct page of the 8411 station form or 
on the data module page. 
digital data endpoints
In the system, devices such as the 510D terminal or the 515-type business communications 
terminal (BCT).
digital signal level 0 (DS0)
A single 64 kbps voice channel. A DS0 is a single 64 kbps channel in a T1 or E1 facility and 
consists of eight bits in a T1 or E1 frame every 125 microseconds.
digital signal level 1 (DS1)
A single 1.544 Mbps (United States) or 2.048 Mbps (outside the United States) digital signal carried 
on a T1 transmission facility. A DS1 converter complex consists of a pair, one at each end, of DS1 
converter circuit packs and the associated T1/E1 facilities.
digital terminal data module (DTDM)
An integrated or adjunct data module that shares with a digital telephone the same physical port for 
connection to a communications system. The function of a DTDM is similar to that of a PDM and 
MPDM in that it converts RS-232C signals to DCP signals.
digital-to-analog converter (DAC)
A device that converts data in digital form to the corresponding analog signals. See also 
analog-to-digital converter (ADC)
.
digital transmission
A mode of transmission in which information to be transmitted is first converted to digital form and 
then transmitted as a serial stream of pulses.
digital trunk
A circuit that carries digital voice and/or digital data in a telecommunications channel.
DIOD
Direct Inward and Outward Dialing
Direct Extension Selection (DXS)
A feature on an attendant console that allows an attendant direct access to telephones by pressing 
a group-select button and a DXS button.
Direct Inward Dialing (DID)
A feature that allows an incoming call from the public network (not FX or WATS) to reach a specific 
telephone without attendant assistance.
Direct Inward Dialing (DID) trunk
An incoming trunk used for dialing directly from the public network into a communications system 
without help from the attendant.
DIVA
Data In/Voice Answer
DLC
Data line circuit