Faulty Ds-1 Link - Nortel DMS-100 Series Maintenance Manual

Operating company personnel may hear the following things:
• dial tone - In this case, operating company personnel have drawn dial tone
from an NT6X17 card. Dial the operator and ask what number you are on.
This will be your faulty line.
• 8 khz tone - This is data line card NT6X71 or NT6X76.
• talk battery - If possible, try hooking up a proprietary phone and calling the
operator to see what directory number (DN) is being used.
Perform this procedure during a maintenance window to avoid possible service
interruptions. Experienced technicians can perform this procedure during the
day if proper precautions are taken.
Procedure 7-4 To identify a faulty line card - method 2
1 Access the line test position (LTP) level of the MAP display.
2 Post any line equipment number (LEN) located on the faulty STAR.
3 Put a tone on the posted LEN, and go to the mainframe with the lineman's
test set and listen to all other LENs on the Star Hub.
Note: Operating company personnel will find two LENs with tone; one will
be the LEN originally posted at the LTP level. The second will be the faulty
line card.

Faulty DS-1 link

Procedure 7-5 To handle a faulty DS-1 link
1 Post the Star Hub.
2 Determine if there are any fault indicators.
3 Display the central side (C-side) links.
4 Post the host PM (line trunk controller or line group controller with an
NTMX77 processor [LTC+ or LGC+] and NTSX05 processor [LTC+ or LGC+]
or remote cluster controller 2 [RCC2]) and determine the peripheral module
(PM) state of the host XPM.
5 If the PM is in service (InSv), display peripheral side (P-side) links. Busy, test,
and RTS the host PM.
6 If the PM is in-service trouble (ISTb), busy and test the host PM in search of
the appropriate card list.
7 Perform the appropriate card replacement procedures.
8 RTS the host PM.
Star Remote System manual maintenance 7-19
DMS-100 Family NA100 Star Remote System XPM15 and up