ATT DEFINITY Communications System Generic 3 Instructions Manual

							Voice Management Overview
Issue  3   March 1996
2-5
nRecorded Announcement
nRecorded Telephone Dictation Access
nRemote Access
nRestriction — Controlle d
nRestriction — Fully Restricted Service
nRestriction — Miscellaneous Terminal
nRestriction — Miscellaneous Trunk
nRestriction — Toll 
nRestriction — Toll/Code
nRestriction — Voice Terminal — Inward
nRestriction — Voice Terminal — Manual Terminating Line
nRestriction — Voice Terminal — Origination
nRestriction — Voice Terminal — Outward
nRestriction — Voice Terminal — Termination
nRingback Queuin g
nRinger Cutoff
nRinging Abbreviated and Delayed
nRotary Dialin g
nSend All Calls
nSenderized Operation
nSingle-Digit Dialing and Mixed Station Numbering
nStraightforward Outward Completion
nTemporary Bridged Appearance
nTenant Partitioning
nTerminal Translation Initialization
nTerminating Extension Group
nThrough Dialing
nTimed Reminder
nTouch-Tone Dialin g
nTransfer
nTransfer - Outgoing Trunk to Outgoing Trunk Trunk Flash
nTrunk Group Busy/Warning Indicators to Attendant
nTrunk Id entification by Attendant 
						

							Functional Description
2-6Issue  3   March 1996 
nTrunk-to-Trunk Transfer
nVoice Message Retrieval
nVoice Terminal Display
nVoice Terminal Alerting O ptions
Specific Attendant Features are listed below.
nDCS Attendant Control of Trunk Group Ac cess
nDCS Attendant Display
nDCS Attendant Direct Trunk Group Selection
nAttendant Auto-Manual Splitting
nAttendant Control of Trunk Group Access
nAttendant Call Waiting
nAttendant Direct Extension Selection With Busy Lamp Field
nAttendant Direct Trunk Group Selection
nAttendant Intrusion (Call Offer)
nAttendant Override of Diversion Features
nAttendant Priority Queue
nAttendant Recall
nAttendant Release Loop Operation
nAttendant Serial Callin g
nAttendant Display
nConference — Attendant
nCentralized Attendant Service  (CAS)
nDial Access to Attendant
nEmergency Access to the Attendant
nIndividual Attendant Access
nInter-PBX Attendant Calls
nPrivacy — Attendant Lockout
nTrunk Group Busy/Warning Indicators to Attendant
nTrunk Id entification By Attendant
nTimed Reminder and Attendant Timers
nVisually Impaired Attendant Service (VIAS) 
						

							Data Management
Issue  3   March 1996
2-7
Data Management
The DEFI NI TY switch is a private digital switching system that permits 
connections with a variety of data e quipment. Data terminals, printers, g raphics, 
facsimile equipment, and computers can be connected to the switch through 
various protocols or interfaces. The physical connection can be through a di gital 
data module, analog modem, or access endpoint.
For use outside the United States, modems that  comply with the ITU-T 108.1 
signaling procedures are supported. Administration forms are available to 
support combine d (external) mo dem p ools.
The system p rovides the ability to option d ata mo dules [or data-like devices such 
as a Data Line Circuit (DLC)] for Terminal Dialing. Also, data mo dules can be 
used without Terminal Dialing with host computers, printers, or other such 
applications. Computer file transfer at a rate of 64 kb ps is possible with the 
Modular Processor Data Module (MPDM) and the Modular Trunk Data Module 
(MTDM).
The family of data modules includes a Wideband Data Module (WDM), Processor 
Data Mo dule (PDM), a Digital Terminal Data Module (DTDM), a Trunk Data 
Module (TDM), a Z702AL1-DSU Data Module Base, a 7400A Data Mo dule, a 
7500B Data Mo dule, an ISDN Asynchronous Data Module (ADM), and a 3270 
Data Mo dule. The data mo dules are generally more versatile than modems, 
operate at faster data rates, and provide additional features.
The WDM provides Wideband (128 kbps plus any multiple of 64 k b ps, up to a 
total of 1984 kb ps) communications between a Wideband data and dialing 
interfaces and an ISDN PRI interface. WDM p rovides for extremely high-speed 
data transmission and is used b y applications ranging from video conferencing 
to data backup.
The DTDM provides synchronous or asynchronous data communications to 
7403D and 7405D digital voice terminal users who have a terminal or personal 
computer. The DTDM and voice terminal integrate data and voice into the Digital 
Communications Protocol (DCP) to the digital switch.
The Z702AL1-DSU Data Mo dule Base provides the Data Communications 
Equipment (DCE) interface connection for a 7407D voice terminal to d ata 
terminals. The module provides full-duplex asynchronous operation only. The 
module and 7407D voice terminal integrate data and voice into the DCP to the 
digital switch.
The MTDM provides an EIA RS-232D Data Terminal Equipment (DTE) interface 
for connection to off-premises (out of building) private-line trunk facilities, or a 
switched telecommunications network, and a DCP interface for connection to the 
d i gital sw itch. The MTDM may also serve as part of a conversion resource for 
modem pooling. The MTDM is also used to interface with DCE-type multiplexers. 
						

							Functional Description
2-8Issue  3   March 1996 
The MPDM provides a DCE asynchronous or synchronous interface for 
connection to data terminals, Call Detail Recording (CDR) output devices, 
DEFI NI TY Com munications System Generic 3 Management Terminals (G3-MT), 
Generic 3 Management Ap plication Systems (G3-MA), on-premises (in building) 
administration terminals, and host computers. The MPDM can be preset in the 
factory to provide the following interfaces:  EIA RS-232C, RS-449, V.35, and 
RS-366 to support Automatic Calling Unit (ACU) type dialing. The MPDM can be 
configured to support the Data Call Setup or Off-Premises Data-Only Extension 
feature. The MPDM also supports data rates of 56 and 64 kbps for downloading 
and other high-speed data transfer requirements.
The 7400A Data Mo dule may b e used instead of an MTDM when supporting the 
combined Modem Pooling feature. The 7400A Data Mo dule sup ports 
asynchronous operation and provides a DCP interface to the switch and an EIA 
RS-232C interface to the associated modem. The 7400A Data Mo dule also can 
be used with a data terminal and supports keyboard  dialing in the same manner 
as the MPDM.
The 7500B Data Mo dule is a stand-alone unit that supports asynchronous or 
synchronous DCE and asynchronous DTE on the ISDN Basic Rate Interface 
(BRI) switch interface (G3, DEFINITY Generic 2 (G2) and the 5ESS switch). In 
asynchronous mode, the 7500B supports p a cket or circuit-switched data 
communications, and can be controlled via the front panel or the keyboard of a 
connected terminal. In synchronous mode, the 7500B supports circuit-switched 
or nailed-up data communications, requires either the Multipurpose 
Enhancement Board or the High-Speed Synchronous Enhancement Board , and 
only can be controlled via the front panel.
When configured as an asynchronous DCE, the 7500B provides an EIA RS-232D 
interface and sup ports full-duplex data transmission at rates of 300, 1200, 2400, 
4800, 9600, and 19200 b ps. The following optional enhancements are available 
for the 7500B in an asynchronous DCE configuration:  an RS-366 ACU interface 
and a se cond asynchronous EIA RS-232D interface. With an additional 
asynchronous EIA RS-232D interfa ce, the 7500B can simultaneously support 
either two D-channel packet data calls or one D-channel p a cket call and one 
B-channel circ uit call. However, the 7500B cannot simultaneously support two 
B-channel circ uit-switched calls.
When configured as an asynchronous DTE, the 7500B provides an EIA RS-232D 
interface and supports full-duplex data transmission at rates of up to 19200 bps. 
This configuration is most commonly used for modem pooling a p plications.
In order to b e c onfigured as a synchronous DCE, the 7500B must have either the 
Multipurpose Enhancement Board or the High-Speed Synchronous 
Enhancement Board. With the Multipurpose Board, the 7500B provides an EIA 
RS-232D interface and an RS-366 ACU interface, and supports full-duplex data 
transmission at rates of 1200, 2400, 4800, 9600, 19200, 56000, and 64000 bps. 
The 7500B also supports half-duplex emulation at rates of 1200, 2400, 4800, 
9600, 19200, and 56000 bps. With the High-Speed Synchronous Enhancement 
Board, the 7500B provides a V.35 interface and supports full-duplex data  
						

							Data Management
Issue  3   March 1996
2-9
transmission at rates of 48000, 56000, and 64000 bps. The 7500B only provides 
half-duplex emulation at a rate of 56000 bps. Regardless of the c onfiguration, the 
7500B provides no voice functions and is not used with voice terminals.
The ISDN ADM may be used with asynchronous DTE as a data stand for 
7500-series BRI voice terminals. Consisting of a b oard located inside the BRI 
voice terminal, the ISDN ADM allows  simultaneous voice and d ata transmissions 
through one terminal. The ISDN ADM supports the standard Hayes command set 
for comp atibility with existing PC communications packages and provides AT&T 
extensions to the standard Hayes command set to allow even g reater flexibility in 
future a p plications. PC a p plications that use the  ISDN ADM Ap plications 
Programming Interface (API) can simultaneously control, monitor, and process 
both voice and data calls.
The DLC, which provides eight ports to connect user’s asynchronous EIA 
RS-232D interfa ce to DTE, can be used as an alternative to DTDM or PDM.
Data mo dules su pp ort the following interfaces:
nAll data modules (except the WDM, MPDM, and 3270) provide a modified 
EIA RS-232D  interfa ce.
nThe WDM provides a ITU-T interface for Wideband transmissions.
nThe MPDM provides either EIA RS-232D V.35 or RS-449 interface. The 
MPDM can also emulate an Automatic Call Unit (ACU) and supports the 
RS-366 interface. The ACU emulation and RS-366 interface are required 
for Keyboard Dialing and are discussed in the Data Call Setup feature 
description. 
nThe 3270 Data Module provides a Category A coaxial DCE interface for 
connection to 3270-type data terminals or a cluster controller. It also 
provides a DCP interface for connection to the digital switch.
The 3270 Data Module is available in the following three models:
n3270T (Terminal) — connects to a Category A 3270-type terminal, such as 
the IBM. 3278 Information Delivery System. The 3270T Data Module must 
connect through the switch to a 3270C (Controller) Data Module.
n3270A (Asynchronous) — provides the same function as the 3270T Data 
Module. It also allows the 3270-type terminal to emulate a Digital 
Equipment Corporation VT100 or an AT&T asynchronous terminal.
n3270C (Controller) — connects an IBM 3274 or 3276 cluster controller to 
the switch. A 3270C Data Module can contain as many as eight ports.
Trunks or channels of a DS1/E1 can also b e used as non-signaling data 
endpoints with the A c cess End points function. An access endpoint is either a 
non-signaling channel on a DS1/E1 interface or a non-signaling port on an 
Analog Tie Trunk circ uit pack that is assigned a unique extension. Since an 
access endpoint is non-signaling, it neither generates nor responds to signaling. 
As a result, an access endpoint cannot be use d as a trunking facility (it cannot  
						

							Functional Description
2-10Issue  3   March 1996 
receive incoming calls or route outgoing calls). An access endpoint is used 
primarily to support devices, switches, or services that have a trunk interface but 
do not support signaling for the trunk. An access endpoint may be d esignated as 
the originating (local) endpoint or destination en d point in an Administered 
Connection. The status of an access endpoint can be displayed by entering the 
status access-endpoint command from the G3-MT/G3-MA or a PC with a 
terminal emulator.
The system supports digital-to-digital, digital-to-analog, analog-to-digital, and 
analog-to-analog data calls. For data calls, the user can access the system 
through these digital or analog data endpoints. Digital data en d points are data 
modules and associated data equipment, PCs, and data channels [used for 
remote G3-MT terminals, and CDR] . Analog data endpoints are modems (or 
acoustic coupled modems) and associated data equipment connected to the 
system through analog lines or trunks. Voice-band data calls using modems can 
be connected to the system through digital trunks.
The system supports DCP. This protocol provides framing, control, and  signaling 
for each of two information channels. Only one channel is used for voice-only or 
data-only a p plications. Both channels are used for simultaneous voice and data 
transmission. Simultaneous voice and data information can b e transmitte d on 
c alls to or from a 7403D or 7405D voice terminal with a DTDM, a 7404D with its 
b uilt-in data module, any 7400-series with an optional data module base, and 
any 8400 series voice terminal with listed 7400 d ata module. Calls to or from 
other equipment are either voice-only or data-only.
ISDN-BRI provides one 16 k b ps signaling channel (D-channel) and two 64 kbps 
information channels (B-channels), with a total information rate of 144 kbps. The 
primary purpose of the signaling channel is to convey Q.931 messa ge-oriented 
signaling for the setup and tear down of calls carried by the B-Channels on the 
BRI. Since all the signaling is done on the D-channel, both B-channels are 
‘‘clear.’’ As a result, the entire widths of the B-channels are used for 
simultaneously carrying voice and circuit-switched data. Voice and data 
information c an be simultaneously transmitte d on c alls to or from a 7505, 7506, or 
7507 voice terminal equip ped with an optional ADM. Without the optional ADM, 
the 7505, 7506, and 7507 voice terminals can handle voice-only calls.
Data Networking
Data networking connects two or more data endpoints. The system is a highly 
reliable, centralized switch that provides switched access between en d points. 
Typical data communications configurations for the system are shown in Figure 
2-1.
Switc h ed  access allows one terminal to connect to one of any number of 
devices. Therefore, more effective use of data equipment is obtained than with 
dedicated (hard-wired) links. Switched access also reduces the need for 
duplicated (dedicated) equipment. Switched Ac cess systems can emulate 
hardwired networks through use of the Ad ministered Connections feature. 
						

							Data Management
Issue  3   March 1996
2-11
The system uses twiste d-p air standard building wiring and eight-pin modular wall 
jacks. Each wall jack is a single outlet that can handle simultaneous voice and 
data information.
The d i gital switch, data modules, DCP, twisted-pair wiring, modular wall jacks, 
and switched data features give the system its unique capabilities. These 
capabilities merge the business office data processing and telecommunications 
functions into a single system.
Figure 2-1. System Data Communications Configuration
Generally, data networks are either local area networks, extended networks, or 
combinations of both. The two networks and their implementation within the 
system are d efined as follows:
HOST
COMPUTER 513 BCT
TERMINAL 7404D WITH
BUTTON
DATA MODULE
DATA
TERMINAL
PROCESSOR
DATA MODULE
515 BCT
TERMINALANALOGDCPDCP
DCP DCP
DLC³DCP
DCPDCP*
COAX A RS-232C
RS-232C RS-232C
RS-232CRS-232CRS-232C
DEFINITY
GENERIC 3
PROCESSOR
DATA MODULE
3270-TYPE
DATA MODULEDATA
TERMINAL EIA PRINTER
LEGEND
*  DCP - DIGITAL COMMUNICATIONS PROTOCOL
²  ADU - ASYNCHRONOUS DATA UNIT ³  DLC - DATA LINE CIRCUIT
ADU²
DATA MODEM
3270-TYPE
DATA
TERMINAL
ANALOG
VOICE
TERMINALPROCESSOR
DATA MODULE DATA
TERMINALDATA
TERMINAL
DIGITAL VOICE
TERMINAL WITH
AN ATTACHED
DIGITAL
TERMINAL DATA
MODULE 
						

							Functional Description
2-12Issue  3   March 1996 
nLocal Area Networks (LANs) 
The system provides this capability by connecting communication 
devices physically located within a local-area or campus-like environment.
These include conventional, semi-intelligent, and intelligent data 
terminals, personal computers, host computers, and virtually any device 
with the proper communications interface.
The centralized network provides circ uit-switched p aths using twisted-pair 
building cable that extends to the endpoints. Since the business office 
equipment can access multiple data systems, the data equipment and 
applications can be used more productively. The system also provides 
several data-related features that are easy to use and contribute to 
expedient use of the system and its networking capabilities.
nExtended Networks 
Extended networks mainly provide connections between the system and 
other distant switches, including remote access facilities. With remote 
access facilities, a local terminal can access remote host computers. Also, 
remote terminals can access either local computer facilities or other 
remote comp uter facilities. Extended networks are constructed of analog 
or digital facilities and can be either p u blic or private. Typical networking 
configurations are shown in Figure 2-2. Public networks available in the 
US include the following:
— Local Central Office (CO) switching extended through direct 
distance dialing
— Foreign exchange (FX) central office trunking
— Wide Area Telecommunications Service (WATS)
— MEGACOM Telecommunications Service
— MEGACOM 800 Telecommunications Service
— Software Defined Network (SDN)
— Software Defined Data Network (SDDN) (G3i)
— ACCUNET. Digital Service
nPrivate networks include:
— AT&T DATAPHONE. Data Communications Service
— Distributed Communications System (DCS)
— Electronic Tandem Network (ETN)
— Enhanced Private Switched Communications Service (EPSCS )
— Private line (PL)
— Software Defined Network (SDN)
— Software Defined Data Network (SDDN)
— Tandem tie trunk 
						

							Data Management
Issue  3   March 1996
2-13
Figure 2-2. System Networking Configurations
Data Communications Protocols and Interfaces
A protocol is a set of conventions or rules that governs how data is transmitted 
and received. The rules generally cover the following:
nPhysical interface
nMechanical interface
nElectrical interface
nFraming
ANALOG - PRIVATE
NETWORK FACILITIES
EPSCS
ETN
PL
TANDEM TIE TRUNKS
DIGITAL - PRIVATE
NETWORK FACILITIES
ANALOG - PUBLIC
NETWORK FACILITIES
DIGITAL SERVICE DATAPHONE  ETN
DS1
LOCAL AREADATA TERMINALS
PERSONAL COMPUTERS
PRINTERS
FACSIMILE EQUIPMENT
OTHERS
COMPUTERHOST
PRIVATE LINES APPLICATIONS
PROCESSOR
CENTRAL
OFFICE
DATA
TERMINAL
HOST
COMPUTER
REMOTE ACCESS FACILITIES
SYSTEM A
SYSTEM CSYSTEM B
WATS
FX TRUNKS
CO TRUNKS
DIGITAL - PUBLIC
NETWORK FACILITIES
DS1/CO
DS1/FX
DS1/WATS
ISDN-PRI 
						

							Functional Description
2-14Issue  3   March 1996 
nError detection and control
Communications protocols are designed to meet the transmission requirements 
for specific data exchange and data communications equipment. These 
communications protocols are sponsored by a national or international 
organization or a major corporation. The system e quipment and communications 
processing software provide the following protocols:
nISDN Protocols
nEIA RS-232C
nRS-449
nRS-366
nStandard Serial Interface (SSI)
nTeletypewriter (TTY) Modes
nDigital Communications Protocol (DCP)
nBX.25 Packet Switching
nITU-T V.35
nWideband Switching
nBinary Synchronous Communications (Bisync )
ISDN Protocols
The ISDN Q.931 Proto c ol is used to support Layer 3 call control signaling for both 
the network and user sides of an ISDN Primary Rate Interface (PRI). Both DS1 
and E1 digital transmission standards are supported on a per-interface basis. 
This implementation provides call state transition, proper message content, and 
error recovery, as well as protocol support for other related features. For all 
switches (except G3vs/G3s ABP), the ISDN Q.932 Protocol is used to support the 
CallVisor Adjunct Switch Ap plications Interface (ASAI) required for the Inbound 
Call Management feature.
Electronic Industries Association (EIA)
EIA RS-232D
This protocol is widely used for short distance and low-sp eed applications such 
as data terminals and modems connecting data terminals. The data link  consists 
of a 25-conductor cable. The conductors are used for data-link control and 
timing, as well as for transmitting and receiving signals. Data-link control is 
accomplished by handshake signaling between the transmit and receive 
devices. Data speeds are limited to 19.2 kb ps or fewer.