P-Side Link Diagnostic - Nortel DMS-100 Series Maintenance Manual

9-44 Trouble isolation and correction
The location of the failure in the DMS office appears in the failure message.
The message identifies the production engineering code (PEC) of the card
suspected of the failure.
The parts of the A/B-DDL card tested depend on the SMS mode of
operation. When the SMS is OOS, a complete diagnostic occurs. When the
SMS is InSv, testing is limited to hardware and functions that do not
interfere with the InSv operation. The InSv tests are a subset of OOS tests.
The following sections of the A/B-DDL card are tested:
When the SMS is OOS, all sections of the A/B-DDL card are tested. When
the SMS is InSv, the ROM, control, messaging, and timing circuits, and
spare memory locations of the RAM are tested. The RAM is tested
completely when the SMS is OOS.

P-side link diagnostic

To test a DS-1 link at the PM level, post the associated SMS. Make sure the
SMS and the associated RCS are InSv. Enter the command string
<number>
With an InSv link, the
loopback test on the link. The SMS sends a PCM pattern over the DS-1 link
to the RCS. The RCS loops the pattern in the time switch card and returns
the pattern to the SMS. The SMS compares the sent and received samples.
If the PCM loopback test fails, the DMS-100 generates PM181, PM183, and
PM128 logs. The system busies the link that fails and places the associated
SMS and RCS in an ISTb state. Refer to the following examples:
PM181 MAY16 09:22:12 4588 INFO SMS 60
Node:
PCM Loopback test failed on P-side link 5
PM183 MAY16 09:23:00 4677 SYSB SMS 60
InSv
PM128 MAY16 09:23:33 4877 TBL ISTb SMS 60
Node
Unit0 Inact: InSv
Unit1
297-8231-550 Standard 09.01 August 1998
the 8085 microprocessor sanity
the ROM
the RAM
the control, messaging, and timing circuits
the transmit and receive interface circuits.
.
>TST
ISTb, Unit0 Inact: InSv,
: ISTb (PSLink OOS) From InSv
Act: InSv
command causes the SMS to perform a PCM
Unit1 Act:
>TST LINK
ISTb
P-side LINK: 2, FROM: