A- And B-Bit Diagnostic; Csm Diagnostic - Nortel DMS-100 Series Maintenance Manual

timers/integrated circuits that you can program.
Note: After the system runs the ROM diagnostic, operating company
personnel must load the unit again.

A- and B-bit diagnostic

The A- and B-bit diagnostic tests the A- and B-bit circuits on the NT6X44
time switch card. The A- and B-bit test the global loop-around of the time
switch card. The A- and B-bit test the channel supervision message (CSM)
loop-around of the NT6X41 formatter card.
The diagnostic performs the following tests:
random access memory (RAM) on the A/B transmit and receive
memories
time switching function of the time switch
generation and reception of A- and B-bits
enable-disable function of the A/B-bit receive memory.
The diagnostic involves the following SMS hardware components:
NT6X85 DS-1 interface card
NT6X44 time switch card
NT6X69 message card NT6X69AD ASIC version if the universal tone
receiver (UTR) is present
NT6X41 formatter card
speech bus

CSM diagnostic

The CSM diagnostic tests the hardware involved in the transmission,
reception, and use of the CSM. Most of this hardware resides on the
NT6X42 CSM card. The diagnostic tests all of the memories on the
NT6X42 card and the memory on the NT6X41 formatter card.
The CSM diagnostic tests the following:
integrity match-mismatch logic
channel data byte (CDB) transmission and reception logic
speech bus parity error generation NT6X41 formatter card and detection,
NT6X42 CSM card, logic.
The diagnostic checks for:
actions between bits of the parity error RAM
DMS-100 Family SMS Maintenance Manual XPM10 and up
Trouble isolation and correction 9-39