Avaya 03-300430 User Manual

This test is nondestructive and is designed to test the board’s interface to the TDM bus and the 
functions of all 24 on-board DSPs (Digital Signal Processors).  There are three functional types 
of DSPs:

●

talkers – put data on the TDM bus

●

listeners – take data off the TDM bus

●

echo cancelers – as implied

Listener and echo cancelers are tightly coupled because firmware allocates sets of DSPs.  
Since there are a total of 24 DSPs on the board, there can be up to 8 triplets allocated.
If the test fails for every DSP, a MAJOR alarm is raised against the board.  If the test fails for one 
or more DSPs, a MINOR alarm is raised.  If a DSP is busy, the test for that particular DSP is 
considered passed.  The test aborts if the system resources (for example, the TDM time slots, 
Tone Generator, and others) are not available.
This test applies to TN2305 and TN2306 ATM-EIs, both active and standby, and is run as part of 
craft short and long testing, periodic, scheduled, initialization, and error analysis testing.  Refer 
to 

on page 570 for a diagram of this loop-around test.

1002

ABRT

The system could not allocate time slots for the test.  The system could be 
under heavy traffic conditions or it could have time slots out of service due 
to TDM-BUS errors.

1. If the system has no TDM-BUS errors and is not handling heavy traffic, 

retry the command at 1-minute intervals up to 3 times.

 1 of 3

ATM

circuit

pack

iodfatmd AWF 040699

DSP echo

DSP listener

CCMS

CCMS

DSP talker

Tone detector

TDM bus

(PN X)

Tone clock

Tone detector