Atm-Dch (Atm D-Channel Port) - Avaya S8700 Maintenance Manual

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ATM-DCH (ATM D-Channel Port)

MO's Name (in

pp is administered as a port in the range of 9 through 32.

For additional related information, see

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.

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 ATM-TRK. When an in-line error is sent due to

packet-bus errors, the ATM circuit pack MO receives the error, not

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

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)''

Initial System Technician

Command to Run

test port UUCSSpp l

test port UUCSSpp sh

''ATM-TRK (Circuit Emulation Service Circuit

Full Name of MO

ATM D-Channel

Issue 1 May 2002