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Server Alarms - Avaya Support

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ATM-TRK (Circuit Emulation Service Circuit Pack)<br />

1. Check the connections between the fiber cable, the ATM-TRK circuit pack, and the ATM<br />

switch.<br />

2. See PKT-BUS (Packet Bus) for test and corrective procedures.<br />

3. Determine what type of fiber is installed between the ATM-TRK circuit pack and the ATM<br />

switch.<br />

If Then<br />

There is multimode fiber Check the length of the fiber. If the cable is<br />

longer than 2 km, it may be causing errors.<br />

There is single-mode fiber or the length of<br />

the multimode fiber is less than 2 km<br />

4. Perform ATM loopback tests on the near-end ATM-TRK circuit pack and on the far-end<br />

circuit pack or ATM switch.<br />

If Then<br />

The ATM-TRK circuit pack fails the<br />

loopback test.<br />

The far-end circuit pack or ATM switch<br />

fails the loopback test.<br />

The equipment at each end of the ATM<br />

span passes the loopback test<br />

The source of the errors can lie in the ATM<br />

facility, the ATM-TRK circuit pack, or the far-end<br />

circuit pack.<br />

The problem is in the ATM-TRK circuit pack.<br />

Replace the circuit pack.<br />

5. Check capacity and peak bandwidth consumption for the ATM span.<br />

If Then<br />

The capacity of the span is inadequate, or<br />

bandwidth consumption is too high.<br />

The problem is in the far-end circuit pack or ATM<br />

switch. Consult the circuit-pack or ATM switch<br />

documentation for advice.<br />

The problem is somewhere in the ATM span. Lack<br />

of bandwidth can be forcing an intermediate ATM<br />

switch to drop cells.<br />

Reduce traffic on the system to ensure that it is<br />

using no more that its subscribed bandwidth.<br />

h. Error Type 771: the ATM switch is sending cells with unknown Virtual Path-Identifier (VPI)<br />

and Virtual Channel-Identifier (VCI) addresses.<br />

1. Make sure that the ATM-TRK circuit-pack address is administered identically on the ATM<br />

switch and the S8700-series system.<br />

i. Error Type 1281: Board major signals error (loss of high-level signal). The far end has<br />

detected a major problem in transmissions originating from the ATM-TRK circuit pack. The<br />

possible Aux Data values for this software counter are listed in Table 151: Error type 1281<br />

Aux Data and repair procedures on page 566.<br />

Communication Manager Release 5.0 Issue 4 January 2008 565

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