Maintenance Objects
555-233-119
820
Issue 5 October 2002
ISDN-BRI endpoints come in a number of configurations. All endpoints require the
D-channel to convey signaling information to the switch. A voice-only set requires
only one B-channel. A voice and data-capable set requires both B-channels (one
for voice and one for data). Therefore, each TN556 port can support either two
voice-only sets or one voice and data-capable set. Only a single ASAI or adjunct
may be connected to an ISDN-BRI port. Multiple adjuncts per line are not
supported.
Figure 24
illustrates the physical connection (solid line) between an ISDN-BRI
Circuit Pack and a voice or voice/data set. Each physical connection allows for
two B-channels, as stated above, plus 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 and adjuncts.
Figure 24.
ISDN-BRI Set Interactions
This section contains the ISDN-BRI Set, ASAI Adjunct, and Adjunct Maintenance
documentation. Some of the results of maintenance testing of the ISDN-BRI Set
or the ASAI and Adjunct may be affected by the health of the ISDN-BRI circuit
pack and Port. These interactions should be kept in mind when investigating the
cause of ISDN-BRI Set problems.
BRI Line
Circuit Pack
P
O
R
T
D-Channel
B-Channel
B-Channel
PHYSICAL CONNECTION
VOICE
or DATA
SET
Logical Connection
VOICE
or DATA
SET
PBX
Physical Connection