TR-LN-BD (Trunk Line Board)
Issue 1 May 2002
8-1691555-233-143
TR-LN-BD (Trunk Line Board)
The TN797 Analog Trunk and Line circuit pack provides 8 ports, any of which may
be administered as one of the following:
In the U.S., Canada, and like countries, every CO trunk port of TN797 Analog
Trunk and Line circuit packs should be administered as GS (ground-start) trunks
rather than as loop-start trunks, because GS signaling provides disconnect
supervision, and loop start does not. If for some reason, a port on the TN797
must be administered as loop start, it must be administered as 1-way only – either
incoming or outgoing – not only at the S8700 Multi-Connect switch, but also at the
CO switch. This is necessary to avoid collisions (i.e., “glare”) and other highly
undesirable conditions.
The TN797 Analog Trunk and Line circuit pack does not support Neon Lamp MWI
(Message Waiting Indication). No maintenance of the terminal connected to the
Neon Analog Line circuit pack is performed.
For circuit pack problems, see ‘‘XXX-BD (Common Port Circuit Pack)’’ on page
8-1872.
Table 8-656. TN797 Analog Trunk and Line circuit pack – port
administration
Function Group Type Trunk Type LED MWI
Central Office trunk (CO) co
fx
wats
loop start
ground start
CAMA/E911 trunk cama
Direct Inward Dialing
(DID) trunk
did wink start
immed start
Analog Line
on-or-off premises
n/a n/a with/
without MWI
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