Cisco ONS 15310-MA Troubleshooting Manual page 92

Alarm Procedures
Clear the TU-LOP Alarm
Complete the
Step 1
If the alarm does not clear, log into the Technical Support Website at
Step 2
http://www.cisco.com/cisco/web/support/index.html for more information or call Cisco TAC
(1-800-553-2447) in order to report a Service-Affecting (SA) problem.
2.7.132 LO-RXPOWER
The Equipment Low Receive Power alarm is an indicator for STM port received optical signal power.
LO-RXPOWER occurs when the measured optical power of the received signal falls below the threshold
value, which is user-provisionable.
Clear the LO-RXPOWER Alarm
At the transmit end of the errored circuit, increase the transmit power level within safe limits.
Step 1
Step 2 Find out whether new channels have been added to the fiber. The number of channels affects power. If
channels have been added, power levels of all channels need to be adjusted.
Find out whether gain (the amplification power) of any amplifiers has been changed. Changing
Step 3
amplification also causes channel power to need adjustment.
If the alarm does not clear, remove any receive fiber attenuators or replace them with lower-resistance
Step 4
attenuators.
If the alarm does not clear, inspect and clean the receive and transmit node fiber connections according
Step 5
to site practice. If no site practice exists, complete the procedure in the "Maintain the Node" chapter in
the Cisco ONS15310-MA SDH Procedure Guide.
Caution Always use the supplied electrostatic discharge wristband when working with a powered
ONS 15310-MA SDH.
If the alarm does not clear, ensure that the fiber is not broken or damaged by testing it with an optical
Step 6
test set. If no test set is available, use the fiber for a facility (line) loopback on a known-good port. The
error reading you get is not as precise, but you generally know whether the fiber is faulty. For specific
procedures to use the test set equipment, consult the manufacturer.
If the alarm does not clear, and no faults are present on the other port(s) of the transmit or receive card,
Step 7
do a facility loopback on the transmit and receive ports with known-good loopback cable. Complete the
"1.2.1 Perform a Facility Loopback on a Source-Node Port" procedure on page 1-4
Step 8 If a port is bad and you need to use all the port bandwidth, complete the
procedure on page
at the next available maintenance window.
Cisco ONS 15310-MA SDH Troubleshooting Guide, Release 9.0
2-92
"Clear the AU-LOP Alarm" procedure on page
Default Severity: Minor (MN), Non-Service-Affecting (NSA)
SDH Logical Object: STM
2-153. If the port is bad but you can move the traffic to another port, replace the card
Chapter 2 Alarm Troubleshooting
2-91.
to test the loopback.
"Physically Replace a Card"
78-18663-01