ATM-TRK (Circuit Emulation Service Circuit Pack)
Issue 1 May 2002
8-277555-233-143
3. Determine what type of fiber is installed between the ATM-TRK
circuit pack and the ATM switch.
4. Perform ATM loopback tests on the near-end ATM-TRK circuit pack
and on the far-end circuit pack or ATM switch.
5. Check capacity and peak bandwidth consumption for the ATM span.
h. Error Type 771: the ATM switch is sending cells with unknown Virtual
Path-Identifier (VPI) and Virtual Channel-Identifier (VCI) addresses.
1. Make sure that the ATM-TRK circuit-pack address is administered
identically on the ATM switch and the S8700 Multi-Connect system.
i. Error Type 1281: Board major signals error (loss of high-level signal). The
far end has detected a major problem in transmissions originating from the
ATM-TRK circuit pack. The possible Aux Data values for this software
counter are listed in Table 8-120.
If Then
There is multimode fiber Check the length of the fiber. If the cable is
longer than 2 km, it is probably causing the
errors.
There is single-mode fiber or
the length of the multimode fiber
is less than 2 km
The source of the errors can lie in the ATM
facility, the ATM-TRK circuit pack, or the
far-end circuit pack.
If Then
The ATM-TRK circuit pack
fails the loopback test.
The problem is in the ATM-TRK circuit
pack. Replace the circuit pack.
The far-end circuit pack or
ATM switch fails the
loopback test.
The problem is in the far-end circuit pack
or ATM switch. Consult the circuit-pack
or ATM switch documentation for advice.
The equipment at each end
of the ATM span passes
the loopback test
The problem is somewhere in the ATM
span. Lack of bandwidth can be forcing
an intermediate ATM switch to drop cells.
If Then
The capacity of the span is
inadequate, or bandwidth
consumption is too high.
Reduce traffic on the system to ensure
that it is using no more that its subscribed
bandwidth.
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