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ADDENDUM TO ISSUE 4 OF THE AXXESS MANUALOCTOBER 1997
Page 50 of 73
Primary Rate T1 Service
Primary Rate T1 service is already described in the
Issue 4 manual. (See pages 2–22, 3–68, 4–21, 4–22,
6–138, 6–139, 6–143, 6–252, 6–262, 7–4, and 8–3.)
However, the following additional information may be
helpful in installing and programming Primary Rate T1
Service.
Specifications
On the AXXESS System, primary rate T1 service must
be 23B+D. Primary Rate service is available only on
AXXESS Systems equipped with CPU020/PCM cards.
It cannot be used on systems with CPU/MEM cards.
NOTE: For version 4.1 and 4.2 Software: For optimal
system performance, no more than four T1 Cards
should be equipped with PRI Daughter Cards. For ver-
sion 4.3 Software: For optimal system performance, no
more than six T1 Cards should be equipped with PRI
Daughter Cards.
The available ISDN services are shown in the chart be-
low. They are divided into two categories: services sup-
ported by AXXESS and unsupported services. If the B-
channel trunks provide an unsupported service, the
system will still function properly. However, it will not
make use of the service.
SUPPORTED BY AXXESS UNSUPPORTED
•
Automatic Number
Identification (ANI)
•
B-Channel Negoti-
ation
•
On-Demand B-Chan-
nel Selection
•
Dialed Number Iden-
tification Service
(DNIS)
•
Calling Party Number
•
D-Channel Backup
•
Flexible Billing
•
Network Ring Again
•
Non-Facility Associ-
ated Signaling
(NFAS)
•
Primary Rate Inter-
face Nodal/Centrex
Express
•
PRI & Private Line
Integration
•
Switched Digital Ser-
vices
•
User-To-User Infor-
mation
• WideAreaACD
• AT&T Call-By-Call
Service Selection
The AXXESS System is designed to support only
AT&T 4ESS, AT&T 5ESS (not 5ESS National ISDN),
and DMS-100/250 switch types. No other switch types
are currently supported by the AXXESS system.
NOTE: Primary Rate trunks that are not subject to toll
restriction will not return dial tone. This is because
these unrestricted trunks are treated as if they are con-
nected to another AXXESS System. Therefore, no dial
tone is provided, no digits are collected, and the setup is
immediate.
When ordering Primary Rate Interface services, refer to
the following chart for the information your carrier will
need to know:
Protocol Custom ISDN only (we do not
support National ISDN)
Signaling Clear Channel 64Kbs
Framing ESF
Coding B8ZS
Jack Type RJ48C
Data Normal (not inverted)
Glare CPE Yields on Incoming Calls
Terminology
Some common terms associated with Primary Rate and
ISDN include the following:
2B+D: A 2B+D circuit is divided into two 64 kbps B-
channels that can carry voice, video, or data. It also has
a 16 kbps D-channel for low-speed data and signaling.
There are two types of 2B+D interfaces that use differ-
ent wiring: the “U” interface uses a single twisted pair
and the “S/T” interface uses two twisted pairs. This is
also referred to as “Basic Rate Interface (BRI).” This is
not supported in AXXESS version 4.X software.
23B+D: A 23B+D circuit is divided into 23 B-channels
(64 kbps each) that can carry voice, data, and video si-
multaneously. It also has a 64 kbps D-channel for out-
of-band signaling, call control, and packet data.
(NOTE: The AXXESS System does not support the
use of the D-channel for packet data.). This interface
uses two twisted-pairs of wire. This is also referred to
as “Primary Rate Interface (PRI).”
30B+D: This is the standard European ISDN interface.
A 30B+D circuit is divided into 30 B-channels (64
kbps) that can carry voice, data, and video simulta-
neously. It also has a 64 kbps D-channel for out-of-
band signaling and call control, and one framing chan-
nel. This interface uses two twisted-pairs of wire.