Lucent Technologies DEFINITY Enterprise Communications Server Release 8.2 Instructions Manual

							DEFINITY ECS Release 8.2
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H12
An ISDN information transfer rate for 1920-kbps data defined by CCITT and ANSI standards.
handshaking logic
A format used to initiate a data connection between two data module devices.
hertz (Hz)
A unit of frequency equal to one cycle per second.
high-reliability system
A system having the following: two control carriers, duplicate expansion interface (EI) circuit packs in the 
PPN (in G3r with CSS), and duplicate switch node clock circuit packs in the switch node (SN) carriers. See 
also duplicated common control
, duplication, duplication option, and critical-reliability system.
HNPA
See home numbering-plan area code (HNPA).
holding time
The total length of time in minutes and seconds that a facility is used during a call.
home numbering-plan area code (HNPA)
The local area code. The area code does not have to be dialed to call numbers within the local geographical 
area.
hop
Nondirect communication between two switch communications interfaces (SCI) where the SCI message 
passes automatically without intermediate processing through one or more intermediate SCIs.
host computer
A computer, connected to a network, that processes data from data-entry devices.
hunt group
A group of extensions that are assigned the Station Hunting feature so that a call to a busy extension reroutes 
to an idle extension in the group. See also ACD work mode
.
Hz
See hertz (Hz).
I
I1
The first information channel of DCP.
I2
The second information channel of DCP.
I2 Interface
A proprietary interface used for the DEFINITY Wireless Business System for the radio-controller circuit 
packs. Each interface provides communication between the radio-controller circuit pack and up to two wire-
less fixed bases. 
I3 Interface
A proprietary interface used for the DEFINITY Wireless Business System for the cell antenna units. Each 
wireless fixed base can communicate to up to four cell antenna units. 
						

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IAS
Inter-PBX Attendant Service
ICC
Intercabinet cable or intercarrier cable
ICD
Inbound Call Director
ICDOS
International Customer-Dialed Operator Service
ICHT
Incoming call-handling table
ICI
Incoming call identifier
ICM
Inbound Call Management
IDDD
International Direct Distance Dialing
IDF
Intermediate distribution frame
IE
Information element
immediate-start tie trunk
A trunk on which, after making a connection with a distant switching system for an outgoing call, the system 
waits a nominal 65 ms before sending the digits of the called 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 dig-
its.
IMT
Intermachine trunk
in
Inch
INADS
Initialization and Administration System
ICLID
Incoming Caller ID
incoming gateway
A PBX that routes an incoming call on a trunk not administered for Supplementary Services Protocol B to a 
trunk not administered for Supplementary Services Protocol B.
information exchange
The exchange of data between users of two different systems, such as the switch and a 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 terminals into a single packet-switching system. 
						

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INS
ISDN Network Service
inside call
A call placed from one telephone to another within the local communications system. 
Integrated Services Digital Network (ISDN)
A public or private network that provides end-to-end digital communications for all services to which users 
have access by a limited set of standard multipurpose user-network interfaces defined by the CCITT. Through 
internationally accepted standard interfaces, ISDN provides digital circuit-switched or packet-switched com-
munications within the network and links to other ISDNs to provide national and international digital commu-
nications. See also Integrated Services Digital Network Basic Rate Interface (ISDN-BRI)
 and Integrated 
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-kbps B-channels for trans-
mitting voice or data and one 16-kbps D-channel for transmitting associated B-channel call control and 
out-of-band signaling information. ISDN-BRI also 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 digital 
terminals fitted with ISDN terminal adapters. See also Integrated Services Digital Network (ISDN)
 andInte-
grated 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 includes 24 64-kbps chan-
nels, corresponding to the North American digital signal level-1 (DS1) standard rate of 1.544 Mbps. The most 
common arrangement of channels in ISDN-PRI is 23 64-kbps B-channels for transmitting voice and data and 
1 64-kbps D-channel for transmitting associated B-channel call control and out-of-band signaling informa-
tion. With nonfacility-associated signaling (NFAS), ISDN-PRI can include 24 B-channels and no D-channel. 
See alsoIntegrated Services Digital Network (ISDN)
 andIntegrated Services Digital Network Basic Rate 
Interface (ISDN-BRI).
intercept tone
A tone that indicates a dialing error or denial of the service requested.
interface
A common boundary between two systems or pieces of equipment.
internal call
A connection between two users within a system.
International Telecommunications Union (ITU)
Formerly known as International Telegraph and Telephone Consultative Committee (CCITT), ITU is an inter-
national organization that sets universal standards for data communications, including ISDN. ITU members 
are from telecommunications companies and organizations around the world. See alsoBX.25
.
International Telegraph and Telephone Consultative Committee
See International Telecommunications Union (ITU)
.
interflow
The ability for calls to forward to other splits on the same PBX or a different PBX using the Call Forward All 
Calls feature.
intraflow
The ability for calls to redirect to other splits on the same PBX on a conditional or unconditional basis using 
call coverage busy, don’t answer, or all criteria.
internal measurements
BCMS measurements that are made by the system. ACD measurements that are made external to the system 
(via External CMS) are referred to as external measurements. 
						

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in-use lamp
A red light on a multiappearance voice terminal that lights to show which call appearance will be selected 
when the handset is lifted or which call appearance is active when a user is off-hook.
INWATS
Inward Wide Area Telephone Service
IO
Information outlet
ISDN
See Integrated Services Digital Network (ISDN).
ISDN Gateway (IG)
A feature allowing integration of the switch and a host-based telemarketing application via a link to a gateway 
adjunct. The gateway adjunct is a 3B-based product that notifies the host-based telemarketing application of 
call events.
ISDN trunk
A trunk administered for use with ISDN-PRI. Also called ISDN facility.
ISDN-PRI terminal adapter
An interface between endpoint applications and an ISDN PRI facility. ISDN-PRI terminal adapters are cur-
rently available from other vendors and are primarily designed for video conferencing applications. Accord-
ingly, currently available terminal adapters adapt the two pairs of video codec data (V.35) and dialing 
(RS-366) ports to an ISDN PRI facility.
IS/DTT
Integrated Services/digital tie trunk
ISN
Information Systems Network
ISO
International Standards Organization
ISV
Independent software vendor
ITP
Installation test procedure
ITU
International Telecommunications Union
IXC
Interexchange carrier code
K
kHz
Kilohertz
kbps
Kilobits per second 
						

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kbyte
Kilobyte
kg
Kilogram
L
LAN
Local area network
LAP-D
Link Access Procedure on the D-channel
LAPD
Link Access Procedure data
LATA
Local access and transport area
lb
Pound
LBO
Line buildout
LDN
Listed directory number
LDS
Long-distance service
LEC
Local exchange carrier
LED
See light-emitting diode (LED).
light-emitting diode (LED)
A semiconductor device that produces light when voltage is applied. LEDs provide a visual indication of the 
operational status of hardware components, the results of maintenance tests, the alarm status of circuit packs, 
and the activation of telephone features.
lightwave transceiver
Hardware that provides an interface to fiber-optic cable from port circuit packs and DS1 converter circuit 
packs. Lightwave transceivers convert electrical signals to light signals and vice versa.
line
A transmission path between a communications system or CO switching system and a voice terminal or other 
terminal.
line appearance
See appearance
. 
						

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line buildout
A selectable output attenuation is generally required of DTE equipment because T1 circuits require the last 
span to lose 15–22.5 dB.
line port
Hardware that provides the access point to a communications system for each circuit associated with a tele-
phone or data terminal.
link
A transmitter-receiver channel that connects two systems.
link-access procedure on the D-channel (LAPD)
A link-layer protocol on the ISDN-BRI and ISDN-PRI data-link layer (level 2). LAPD provides data transfer 
between two devices, and error and flow control on multiple logical links. LAPD is used for signaling and 
low-speed packet data (X.25 and mode 3) on the signaling (D-) channel and for mode-3 data communications 
on a bearer (B-) channel.
LINL
Local indirect neighbor link
local area network (LAN)
A networking arrangement designed for a limited geographical area. Generally, a LAN is limited in range to a 
maximum of 6.2 miles and provides high-speed carrier service with low error rates. Common configurations 
include daisy chain, star (including circuit-switched), ring, and bus.
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 system for an outgoing call, the 
system waits for a signal on the loop formed by the trunk leads before sending the digits of the called number.
loss plan
The overall plan, used in network design and management, for creating and maintaining consistent signal 
strength across the network. The term also applies to local management of signal strength to achieve appro-
priate levels for specific applications.
LSU
Local storage unit
LW C
Leave Word Calling
M
MAC
Medium access
MADU
Modular asynchronous data unit
main distribution frame (MDF)
A device that mounts to the wall inside the system equipment room. The MDF provides a connection point 
from outside telephone lines to the PBX switch and to the inside telephone stations. 
						

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main-satellite-tributary
A private network configuration that can either stand alone or access an ETN. A main switch provides inter-
connection, via tie trunks, with one or more subtending switches, called satellites; all attendant positions for 
the main/satellite configuration; and access to and from the public network. To a user outside the complex, a 
main/satellite configuration appears as one switch, with one listed directory number (LDN). A tributary 
switch is connected to the main switch via tie trunks, but has its own attendant positions and LDN.
maintenance
Activities involved in keeping a telecommunications system in proper working condition: the detection and 
isolation of software and hardware faults, and automatic and manual recovery from these faults.
management terminal
The terminal that is used by the system administrator to administer the switch. The terminal may also be used 
to access the BCMS feature.
major alarm
An indication of a failure that has caused critical degradation of service and requires immediate attention. 
Major alarms are automatically displayed on LEDs on the attendant console and maintenance or alarming cir-
cuit pack, logged to the alarm log, and reported to a remote maintenance facility, if applicable.
Manual-In work mode
One of four agent work modes: the mode in which an agent is ready to process another call manually. See 
Auto-In Work mode
 for a contrast.
MAP
Maintenance action process
MAPD
Multiapplication platform for DEFINITY
MA-UUI
Message-Associated User-to-User Signaling
Mbps
Megabits per second
M-Bus
Memory bus
Mbyte
Megabyte
MCC
Multicarrier cabinet
MCS
Message Center Service
MCT
Malicious Call Trace
MCU
Multipoint control unit
MDF
Main distribution frame
MDM
Modular data module 
						

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MDR
Message detail record
MEM
Memory
memory
A device into which information can be copied and held, and from which information can later be obtained.
memory shadowing link
An operating-system condition that provides a method for memory-resident programs to be more quickly 
accessed, allowing a system to reboot faster.
message center
An answering service that supplies agents to and stores messages for later retrieval.
message center agent
A member of a message-center hunt group who takes and retrieves messages for voice-terminal users.
MET
Multibutton electronic telephone
MF
Multifrequency
MFB
Multifunction board
MFC
Multifrequency code
MHz
Megahertz
MIM
Management information message
minor alarm
An indication of a failure that could affect customer service. Minor alarms are automatically displayed 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.
MIPS
Million instructions per second
MIS
Management information system
MISCID
Miscellaneous identification
MMCS
Multimedia Call Server
MMCH
Multimedia call handling
MMI
Multimedia interface 
						

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MMS
Material Management Services
MO
Maintenance object
modem
A device that converts digital data signals to analog signals for transmission over telephone circuits. The ana-
log signals are converted back to the original digital data signals by another modem at the other end of the cir-
cuit.
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, modem pooling inserts a conversion resource into the 
path of a data call. Modem pooling serves both outgoing and incoming calls.
modular processor data module (MPDM)
A processor data module (PDM) that can be configured to provide several kinds of interfaces (RS-232C, 
RS-449, and V.35) to customer-provided data terminal equipment (DTE). See also processor data module 
(PDM).
modular trunk data module (MTDM)
A trunk data module that can be configured to provide several kinds of interfaces (RS-232, RS-449, and V.35) 
to customer-provided data terminal equipment.
modulator-demodulator
See modem
.
monitored call
See active-notification call
.
MOS
Message-oriented signaling
MPDM
Modular processor data module
MS
Message server
ms
Millisecond
MS/T
Main satellite/tributary
MSA
Message servicing adjunct
MSG
Message service
MSL
Material stocking location
MSM
Modular System Management 
						

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MSS
Mass storage system
MSSNET
Mass storage/network control
MT
Management terminal
MTDM
Modular trunk data module
MTP
Maintenance tape processor
MTT
Multitasking terminal
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 same time.
Multicarrier cabinet
A structure that holds one to five carriers. See also single-carrier cabinet
.
Multifrequency Compelled (MFC) Release 2 (R2) signaling
A signal consisting of two frequency components, such that when a signal is transmitted from a switch, 
another signal acknowledging the transmitted signal is received by the switch. R2 designates signaling used 
in the United States and in countries outside the United States.
multiplexer
A device used to combine a number of individual channels into a single common bit stream for transmission.
multiplexing
A process whereby a transmission facility is divided into two or more channels, either by splitting the fre-
quency band into a number of narrower bands or by dividing the transmission channel into successive time 
slots. See also time-division multiplexing (TDM)
.
multirate
The new N x DS0 service (see N x DS0).
MWL
Message-waiting lamp
N
N+1
Method of determining redundant backup requirements. Example: if four rectifier modules are required for a 
DC-powered single-carrier cabinet, a fifth rectifier module is installed for backup.
N x DS0
N x DS0, equivalently referred to as N x 64 kbps, is an emerging standard for wideband calls separate from 
H0, H11, and H12 ISDN channels. The emerging N x DS0 ISDN multirate circuit mode bearer service will 
provide circuit-switched calls with data-rate multiples of 64 kbps up to 1536 kbps on a T1 facility or up to 
1920 kbps on an E1 facility. In the switch, N x DS0 channels will range up to 1984 kbps using NFAS E1 inter-
faces.