Demand test descriptions and error codes - Avaya Support

Communication Manager Maintenance Object Repair Procedures
ATM-DCH (ATM D-Chel Port)
MO Name in Log Alarm Level Initial Command to Run Full Name of MO
ATM-DCH MIN test port location l ATM D-Chel
Note:
Note: TN2305 and TN2306 circuit packs are not interchangeable. Always replace an
ATM circuit pack with the same type.
ATM-DCH uses the existing ISDN-PLK or D-chel 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-Chel, as opposed to one D-Chel for an entire DS1 circuit pack.
Note:
Note: Due to the dual personalities and the number of D-Chels that the ATM board can
possess, the inline errors and signaling port LAN loopback test have been moved
to ATM-TRK (Circuit Emulation Service Circuit Pack). When an inline error is sent
due to packet bus errors, the ATM circuit pack receives the error, not ATM-DCH.
The D-chel 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 chels (B-Chels)
carry digitized voice and digital data and are assigned to DS1 ISDN trunks or PRI endpoints.
Call-control signaling for the B-Chels is combined and carried over the separate ISDN-PRI
Signaling Link port D-Chel.
Problems with ATM-DCH affects every associated B-Chel, since call-control signaling cot 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-TRK (Circuit Emulation Service Circuit Pack)
● PKT-BUS (Packet Bus)
WRN test port location
122 Maintenance Alarms for Communication Manager, Media Gateways and Servers