Avaya 03-300430 User Manual

Note:

TN230x circuit packs are not interchangeable.  Always replace an ATM circuit 
pack with the same type.

ATM-DCH uses the existing ISDN-PLK or D-channel maintenance strategy with modifications.  
The ATM circuit pack can be administered for up to 8 Circuit Emulation Service (CES) or 
signaling groups, each with its own D channel, as opposed to one D channel for an entire DS1 
circuit pack.

Note:

Due to the dual personalities and the number of D channels that the ATM board 
can possess, the in-line errors and signaling port LAN loopback test has been 
moved to the MO 

page 617.  When an in-line error is sent due to packet-bus errors, the ATM circuit 
pack MO receives the error, not ATM-DCH.

The D-channel ISDN-PRI interface is emulated for ATM-CES and uses out-of-band signaling to 
transmit control messages between two endpoints.  User information or bearer channels (B 
channels) carry digitized voice and digital data and are assigned to DS1 ISDN trunks or PRI 
endpoints.  Call-control signaling for the B channels is combined and carried over the separate 
ISDN-PRI Signaling Link port D channel.
Problems with ATM-DCH affects every associated B channel, since call-control signaling cannot 
reach the far-end switch or terminal adapter.  Stable calls can remain operational, but no new 
calls can be made.  In turn, ATM-DCH depends on the:

●

TN230X ATM Trunk circuit pack where it resides

●

Packet bus that provides the link to the processor

When working ATM-DCH alarms or errors, also investigate

●

●

ATM-DCH

MIN

test port location l

ATM D-Channel

ATM-DCH

WRN

test port location sh

ATM D-Channel