ISDN-SGR (ISDN-PRI Signaling Group)
Issue 5 October 2002
1289
555-233-119
Figure 34.
ISDN-PRI Signaling Link Port Interactions (32-Channel - TN464)
There are two types of Signaling Groups:
■
Facility Associated Signaling (FAS) (supported by all country protocols)
■
Non-Facility Associated Signaling (NFAS) (supported by country protocol 1
only)
In an FAS Signaling Group, the 24th port of the DS1 Interface circuit pack (for 24
channel interfaces) or the 16th port of the DS1 Interface circuit pack (for 32
channel interfaces) is always the D-channel that carries signaling information for
the other ports (B-channels) on the circuit pack. If a Packet Control circuit pack is
used then only the TN464C or later circuit pack may be used.
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.
2. TN464C or higher
Processor
(TN798)
UDS1
Interface
circuit pack
TN464
T
D
M
b
u
s
2
(Port 0)
(Port 15)
(Port 16)
Pimary
signaling link
Voice or data
(Port 1)
Voice or data
(Port 17)
Voice or data
(Port 31)
Framing
ISDN -TRK
(B-Channel)
ISDN -TRK
(B-Channel)
ISDN -TRK
(B-Channel)
ISDN -TRK
(B-Channel)
ISDN -PLK
(D-Channel)
cydfisd2 RPY 061297
Slot 1