Ring/Pad Card Diagnostic; Ds-1 Card Diagnostic; Ds-1 Ddl Diagnostic - Nortel DMS-100 Series Maintenance Manual

9-42 Trouble isolation and correction
comparators to detect defective comparators that office synchronization
uses.
This diagnostic involves the following hardware components:

Ring/pad card diagnostic

The ring/pad diagnostic tests the hardware and functionality of the NT6X80
ring/pad card. This diagnostic tests the card reset and memory, and verifies
ring/pad interrupt. The diagnostic performs the tests on the pad ROM and
dc voltages. The hardware the ring/pad diagnostic tests is restricted to the
NT6X80 card.

DS-1 card diagnostic

The DS-1 card diagnostic verifies that DS-1 cards operate correctly. The
diagnostics can check the DS-1 link. This event depends on the type of
activation of the diagnostics. The DS-1 card diagnostic runs during CM link
audits. The diagnostic test runs when the SMS or a DS-1 link RTS from the
MAP terminal. The diagnostic test runs when a user tests the DS-1 link
from the MAP terminal. The PCM looping tests occur during the test of the
DS-1 link from the MAP terminal.
The InSv audit tests all InSv DS-1 links. The OOS audit tests all SysB DS-1
links.

DS-1 DDL diagnostic

The DS-1 DDL diagnostic tests the derived data link circuits of the SLC-96
DS-1 interface card. This diagnostic checks for:
The diagnostic tests the DDL messaging capability of the card. To test this
capability, the diagnostic has the A/B-DDL message card transmit a known
message on the DDL. The time switch card sends the message to the
SLC-96 DS-1 interface card. The message is looped around in the card and
returned to the time switch.
A relay in the SLC-96 DS-1 enables this loop-around. When this relay is
open, the system sends data on DS-1 links.
297-8231-550 Standard 09.01 August 1998
the NT6X44
the NT6X69 (NT6X69AD ASIC version if UTR is present)
correct functioning of DDL synchronization
correct insertion of the DDL supervisory message bits into the outgoing
DS-1 framing bit time slots
removal of the corresponding bits from the incoming frames.