Avaya S8700 Maintenance Manual page 1053

BRI-PORT (ISDN-BRI Port), ABRI-PORT (ASAI
ISDN-BRI Port)
The TN2208 LGATE MFB provides the system with the interface to
Adjunct-Switch Application Interface (ASAI) and Avaya adjuncts (for example,
CONVERSANT
interface (although only 8 are usable by the switch), each of which operates with
two B channels (referred to as B1 and B2 throughout this section) and one D
channel as specified in the Avaya ISDN-BRI Specification. In this context, the
term "ISDN-BRI port" is used to refer collectively to ports on the TN2208 circuit
pack that are connected to ASAI or Avaya adjuncts.
The TN556 and TN2198 ISDN-BRI Line circuit packs provide the system with the
interface to ISDN-BRI endpoints, Adjunct-Switch Application Interface (ASAI) and
Avaya adjuncts (for example, CONVERSANT® Voice System). The circuit packs
contain 12 ports of line circuit interface, each of which operates with two
B channels (referred to as B1 and B2 throughout this section) and one D channel
as specified in the Avaya ISDN-BRI Specification. In this context, the term
"ISDN-BRI port" is used to refer collectively to ports on the TN556 an TN2198
circuit packs that are connected to either BRI endpoints, ASAI or Avaya adjuncts.
For BRI endpoints, each B channel may support voice or circuit-switched data and
may be circuit-switched simultaneously. The B channels are not used on ports
connected to ASAI or Avaya adjuncts. The D channel is used for conveying
signaling between the switch and a BRI endpoint(s), ASAI or Avaya adjunct.
Each ISDN-BRI D channel is connected to the switch processor and the
ISDN-BRI port through the packet bus.
ISDN-BRI endpoints are available in various configurations. Every endpoint
requires the D channel to convey signaling information to the switch. Only one B
channel is required for a voice-only set or a stand-alone data module (BRI-DAT).
A voice and data-capable set requires both B channels (one for voice and one for
data). Therefore, each TN556 or TN2198 port can support either two voice-only
sets, two stand-alone data modules (BRI-DAT), or one voice and data-capable
set. Only a single ASAI or Avaya adjunct may be connected to an ISDN-BRI port.
Multiple adjuncts per line are not supported.
Figure 8-11 on page 8-332
an ISDN-BRI port and its associated ISDN-BRI set(s). Each physical connection
allows for two B channels and one D channel. Each ISDN-BRI circuit pack can
support up to 12 of these physical connections to different voice and voice/data
sets or ASAI or Avaya adjuncts. On a TN2198 each ISDN-BRI circuit pack can
support up to 12 physical connections to a NT1 which in turn connects to 2
terminals.
555-233-143
®
Voice System). The circuit pack contains 12 ports of line circuit
illustrates the physical connection (solid line) between
Issue 1 May 2002 8-331