Faulty Ds-1 Link; Faulty Ringing Generator (Rg) Frequency Generator Circuit; Load File Mismatch - Nortel DMS-100 Series Maintenance Manual

10-4 Trouble isolation and correction
To identify a defective card:
Procedure 10-2
1
2

Faulty DS-1 link

To handle a defective DS-1 link:
1
2
3
4
5
6
7
8

Faulty ringing generator (RG) frequency generator circuit

To handle a defective RG frequency generator circuit:
1
2
Load file mismatch
To handle a load file mismatch:
297-8361-550 Standard 04.01 September 2000
Operating company personnel can hear the following sounds:
• dial tone—Operating company personnel received a dial tone from a
6X17 card. Dial the operator and ask the number you are on. This
number is your defective line.
• 8khz tone— Identified as data line card 6X71 or 6X76.
• talk battery—If possible, connect to a proprietary telephone. Call the
operator to see the directory number (DN) that is in use.
Access the line test position (LTP) level of the MAP display. Post any line
equipment number (LEN) located on the defective LCM.
Put a tone on the posted LEN. Go to the mainframe with the buttset. Listen
to all other LENS on the LCM.
Note: Operating company personnel can locate two LENS with tone. One
LENS is the original LEN posted at the LTP level. The second LENS is the
defective line card.
Post the OPM.
Determine if any fault indicators are present.
Display the central side (C-side) links.
Post the host XMS-based peripheral module (XPM). Determine the
peripheral module (PM) state of the host XPM.
If the host XPM is in-service (InSv), display peripheral side (P-side) links,
busy, test, and RTS the host XPM.
If the host XPM is in-service trouble (ISTb), busy and test the host PM. Busy
and test the host PM to locate the correct card list.
Perform the correct card replacement procedures.
RTS the host XPM.
Test the RG.
If the test fails, replace the RG.