ATT Definity Addendum 1 For Ds1, Dmi, Isdn Pri Instructions Manual

INTRODUCTION1-5
ISDN-PRILINE SIDE
TRUNK SIDE
PUBLIC NETWORK
4E11DCP INTERFACE
DIGITAL
VOICE TERMINALS
TOLL OFFICEDIGITAL FXWITH
CO
ISDN-PRIWITH(Phase 1)ISDN-PRI
5ESS
DIGITAL CO
WITHISDN-PRISYSTEM 85
R2 V4
WITH
PRIVATE NETWORK
ISDN-PRI
SYSTEM 85
DCP INTERFACE
R2 V4
WITHDATA MODULES
OTHER
ISDN-PRIVENDOR SWITCH
WITH
ISDN-PRI
Figure 1-1. System 85 R2V4 ISDN Configuration
With NFAS, if two or more PRI pipes are present, an optional D-channel backup feature is available.
One D-channel is administered as the...

1-6INTRODUCITON
ISDN-PRI
LINE SIDE
TRUNK SIDE
PUBLIC NETWORK
NFASDCP INTERFACE
DIGITALVOICE TERMINALS
TOLL OFFICE
DIGITAL FX
WTIH 4ESSCO
WITH
ISDN-PRI
DIGITAL CO
WITHDCP INTERFACE
ISDN-PRIDEFINITYDATA MODULES
GENERIC 2WITH
ISDN-PRI
PRIVATE NETWORKANDBRI INTERFACE
ISDN-PRI
VOICE TERMINALSNFAS
DEFINITY
GENERIC 2
WITHSYSTEM 85 R2V4,
ISDN-PRI
GENERIC 1,2, OR
BRI INTERFACEVENDOR SWITCHDATA MODULESWITH ISDN-PRI
Figure 1-2. Generic 2 ISDN Network Configuration
Generic 1 and Generic 2 provide ISDN-PRI but do not...

INTRODUCTION1-21
TABLE 1-2. Data Module Capabilities½
Data
ModuleDMI
ModeUser Data
RateSync/
AsyncBit
InvertProtocol
PackagingHandshakeNotes
7400 Series2to 19.2K
to 19.2Kasync
yesHDLCmode 2
DTDM2both
yesHDLCmode 2
MPDM0
1
264K
56K
to 19.2K
sync
sync
both
yesnoyesno
DDS
HDLCmode 2
mode 2
mode 21
MPDM/M1*
0
1
264K
56K
to 19.2K
sync
sync
both
yesnoyes
none
DDS
HDLCno
no
no2
2
2½
½
½
½
½
½
½
½
½
½
½
½
½
3270 A2
3to 19.2K
64Kboth
syncyes
yesHDLC
LAPD/X.25mode 3/2 adapt
mode 3/2 adapt3
4
3270 T364K
sync...

1-22INTRODUCITON
4.
5.
6.
7.
8.
9.
10.Mode-3 data can only be circuit switched in Generic 1.1 and Generic 2.1. Using mode 3 on a 3270A or 3270T requires a 3270C on the far
end.
Mode 2 on the PC/PBX Connection is supported under the ASCII terminal emulation package. The PC/PBX Connection in mode 2 uses a
mode 3/2 adaptive handshake if the bit rate is set to 64K. If the rate is set to 19.2K or slower, a mode 2 handshake is used. 3270 emulation
on the PC/PBX Connection requires a 3270C data module on the...

INTRODUCTION1-23
Common-Channel Signaling
Originally, common-channel signaling (CCS) meant that any of the 24 channels could be used to
transmit signaling for the other 23. To offer CCS, both RBS and 24th-channel signaling would have to
be disabled to make all 24 channels available to transmit signaling.
Current AT&T applications use only the 24th-channel as the signaling channel and, therefore, the term
CCS has been used more and more as a synonym for 24th-channel signaling. Misuse of the term CCS
and...

1-24INTRODUCTION
1
2
3
4Mode-1 data — with the 56K-bps option — should be administered for 56K-bps synchronous data
applications. MPDM uses mode-2 handshake unless using MPDM/M1*.
NOTE: The appropriate data module must be installed and optioned for 56K-bps operation.
This arrangement can be used to support the special format required to support ACCUNET
switched digital service or 56K-bps basic service (if using MPDM/M1*).
Mode-2 data — for data modules and EIA data terminations that do not operate as...

INTRODUCTION1-25
3
4
5
6
7
8
9Unknown digital — used for those calls of any mode (0-3) where the signaling message does not
specify a mode (such as DS1 trunks using common-channel or 24th-channel signaling)
Unkown analog — used for voice or voice-grade data calls where the signaling message does not
specify a type (such as analog trunks and robbed-bit DS1 trunks)
Voice-grade data — used for data applications that use modems
Mode-0 data — used for facilities that transmit 64K-bps data (DCP and BRI...

1-26INTRODUCTION½
½
½
3.
4.
5.The 10 BCs are defined in field 16 of procedure 014, word 1. This definition codes the BC IE in
the setup message when the extension (entered in field 1 of procedure 000, word 3) accesses an
ISDN-PRI trunk for an outgoing call (DCP only).
When a Generic 2 is connected to a 4ESS, assign a network-specific facility (NSF) in procedure
279, word 1½
½
Each interexchange carrier (which provides public network ISDN service) must have a unique
identifier number. Furthermore, each...

INTRODUCTION1-27
For procedure 100, word 2:
Field 1 specifies the trunk group number and field 2 specifies a BCCOS number for this
trunk group. For interworked tandem calls through the switch where the calling trunk is
not ISDN-PRI trunk and the called trunk is, the BCCOS of the non-ISDN-PRI trunk is
used to define a BC for the outgoing setup message over the ISDN-PRI trunk. This COS
also defines other routing parameters.
For procedure 100, word 3:
Field 2 assigns a trunk group as ISDN-PRI that has...

1-28INTRODUCTION
Each call routed to an ISDN signaling trunk group generates a series of Q.931 messages over the
D-channel. For example, the calling party IE of the ISDN-PRI setup message assembles the dialed
digits as ASCII numbers that correspond to the defined numbering-plan format. Also included within
the setup message are the BC requirements, B-channel identification, and network-specific facilities
(NSF). If the requested facilities are not available, either channel negotiation is begun or, if...