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DEFINITY ECS Release 8.2 ATM Installation,
Upgrades, and Administration
555-233-124
Issue 1
April 2000
Troubleshooting
6-33Troubleshooting ATM-PNC
6
Physical layer
Is there an optical signal between the TN2305/TN2306 and the ATM switch?
1. Identify the OC-3/STM-1 ports on the ATM switch that have DEFINITY port
networks attached.
■ Be aware that customers may use other ports on the ATM switch for
applications unrelated to DEFINITY (LAN traffic or multimedia
applications, for examples).
■ These other applications may manifest themselves in the output of
the troubleshooting commands you run on the ATM switch.
DEFINITY port networks must be identified by their ATM switch port
numbers.
NOTE:
The following examples show DEFINITY port networks
connected to ATM switch ports A1.1 and A1.2.
1. Does the TN2305/TN2306’s YELLOW LED flash 100 ms on and 100 ms off,
indicating a loss of signal on the fiber? Recall that the TN2305/TN2306
detects continuity problems with either the transmit (bottom) or the receive
(top) fibers.
If the fiber shows a loss of signal, refer to the “Fiber Fault Isolation
Procedure” in DEFINITY ECS Maintenance for R8r.
2. Is the ATM switch port’s LED indicating a loss of signal on the fiber? Note
that the ATM switch may detect continuity problems only with the receive
fiber; the state of the transmit fiber might not be detected.
3. Refer to your ATM switch’s quick reference guide for troubleshooting
commands.
Possible causes.
Check the following list for possible causes.
■ The fiber is disconnected from the ATM switch and/or the TN2305/TN2306
circuit pack.
■ The transmit and receive fibers are swapped at the ATM switch or the
TN2305/TN2306 circuit pack (but not both).
■ There is a break in the fiber.
■ The TN2305/TN2306 is not transmitting a carrier (not inserted, not
powered, or not administered). See the ATM-EI or ATM-TRK maintenance
objects in DEFINITY ECS Maintenance for R8r.
■ Hardware safety interlocks on optical transceivers may cut transmitter
power if no carrier is received, so lack of a receive carrier could indicate a
transmitter problem at the same end.