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9-12 C
HAPTER
9: M
ONITORING
THE
ATM M
ODULE
The following statistics are available:
Errored Seconds (Near)
The number of errored
seconds
at the ATM Module end of the connection.
Errored Seconds (Far)
The number of
seconds
at the
ATM Switch end of the connection.
Severe Errored Sec (Near)
The number of severely
errored
seconds
at the ATM Module end of the
connection.
Severe Errored Sec (Far)
The number of severely
errored
seconds
at the ATM Switch end of the
connection.
Coding Violations (Near)
The number of c
oding
violations
that have occurred at the ATM Module end
of the connection.
Coding Violations (Far)
The number of
coding
violations
that have occurred at the ATM Switch end
of the physical connection.
Unavailable Seconds (Near)
The number of
seconds
that were unavailable at the ATM interface
on the ATM Module.
Unavailable Seconds (Far)
The number of
seconds
that were unavailable at the ATM interface on the
ATM Switch.
Using Physical Layer Statistics to Troubleshoot
This section describes how to use the physical layer
statistics to track and resolve problems.
If no values are shown on the screen, the problem
probably lies with the ATM Switch rather than the
ATM Module. Follow the troubleshooting information
in the user guide that accompanies your ATM Switch.
High values usually indicate that the SONET standards
are incompatible, or that there is a fault on the cable.
Use the following troubleshooting suggestions to try
and resolve the problem:
1
Check that the ports at both end of the link are
enabled
.
2
Check that the cable is securely connected to the port
at both ends of the link.
3
Check each end of the cable to ensure that each of
the fiber connectors is correctly connected. If you
have connectors that can be reversed, you may need
to reverse the TX and RX cable connectors at one end
of the link.
4
Make sure that the cable does not exceed the cable
length or other technical specifications. Check the
cable against the technical specification given in
Appendix C.
5
Remove any obstructions and straighten out any kinks
in the cable.
6
If you suspect that the fiber optic connector is dirty,
refer to “Cleaning Dirty Fiber Optic Connectors” on
page D-24.