Avaya DEFINITY Server CSI Maintenance Manual page 1305

ISDN-TRK (DS1 ISDN Trunk)
Slot 1
Processor
(TN798)
Figure Notes:
1. B- and D-channel messages are
routed over the TDM Bus. For
additional reliability, a duplex
D-channel can be administered for
a signaling group and located on a
different TN464C (or higher) circuit
pack.
Figure 36. ISDN-PRI Signaling Link Port Interactions (32-Channel - TN464)
For interfaces using country protocol 1 on the DS1 Circuit Pack administration
form (including US), the signaling protocol used for the maintenance of the
B-channel is defined by the ISDN-PRI Specification.
For interfaces using country protocols other than 1, the signaling protocol used for
the maintenance of the B-channel is defined by the CCITT ISDN-PRI
Specification.
There are five possible Service States for a B-channel. The service state is
negotiated with the far-end switch, changes over time, and may have a far-end or
near-end component. The service state is initialized to Out-Of-Service/Far-End
state and an attempt is made to negotiate it to In-Service.
NOTE:
The service state of a particular DS1 ISDN Trunk B-channel can be
displayed by issuing the status trunk <trunk_group/trunk_member>
system technician command.
555-233-119
UDS1
Interface
circuit pack
T
TN464
D
2
M
b
u
s
2. TN464C or higher
(Port 0)
Framing
Voice or data ISDN -TRK
(B-Channel)
(Port 1)
(Port 15)
ISDN -TRK
(B-Channel)
Pimary
signaling link
ISDN -PLK
(D-Channel)
(Port 16)
Voice or data
ISDN -TRK
(B-Channel)
(Port 17)
Voice or data
ISDN -TRK
(B-Channel)
(Port 31)
cydfisd2 RPY 061297
Issue 5 October 2002
1305