Avaya Definity SI, Maintenance Manual, Page: 994 / 2968

Maintenance Object Repair Procedures
555-233-123 10-208 Issue 4 May 2002
ATM-DCH (ATM D-Channel Port)
NOTE:
TN230x circuit packs are not interchangeable. Always replace an ATM
circuit pack with the same type.
This MO (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 maintenance object ATM-TRK. When an in-line error
is sent due to PACKET BUS errors, the ATM circuit pack maintenance
object receives the error, not ATM-DCH.
The D-channel ISDN-PRI interface, which is emulated for ATM-CES, 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 all of the associated B-channels, 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. ATM-DCH in turn depends
on the TN230X ATM Trunk circuit pack it resides on and the packet bus which
provides the link to the processor.
When working ATM-DCH alarms or errors, also investigate
■
‘‘ATM-TRK (Circuit Emulation Service Circuit Pack)’’
■
PKT-BUS (Packet Bus
MO Name (in
Alarm Log) Alarm
Level
Initial System
Technician Command
to Run
1
1 pp is administered as a port in the range of 9 through 32.
Full Name of
MO
ATM-DCH
2
2 For additional related information, see ‘‘ATM-TRK (Circuit Emulation Service Circuit
Pack)’’ .
MINOR test port UUCSSpp l ATM D-Channel
ATM-DCH WARNING test port UUCSSpp sh ATM D-Channel