Cisco 15310-MA Guide de dépannage télécharger pdf (Page 230)

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Cisco ONS 15310-CL and Cisco ONS 15310-MA Troubleshooting Guide, Release 9.0

78-18394-01

Chapter 2 Alarm Troubleshooting

Alarm Procedures

The Equipment Low Receive Power alarm is an indicator for OCN 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

Step 1 At the transmit end of the errored circuit, increase the transmit power level within safe limits.

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.

Step 3 Find out whether gain (the amplification power) of any amplifiers has been changed. Changing

amplification also causes channel power to need adjustment.

Step 4 If the alarm does not clear, remove any receive fiber attenuators or replace them with lower-resistance

attenuators.

Step 5 If the alarm does not clear, inspect and clean the receive and transmit node fiber connections according

to site practice. If no site practice exists, complete the procedure in the “Maintain the Node” chapter in

the Cisco ONS 15310-CL and Cisco ONS 15310-MA Procedure Guide.

Caution Always use the supplied electrostatic discharge wristband when working with a powered ONS 15310-CL

or ONS 15310-MA.

Step 6 If the alarm does not clear, ensure that the fiber is not broken or damaged by testing it with an optical

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.

Step 7 If the alarm does not clear, and no faults are present on the other port(s) of the transmit or receive card,

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 to test the loopback.

Step 8 If a port is bad and you need to use all the port bandwidth, complete the “Physically Replace a Card”

procedure on page 2-163. If the port is bad but you can move the traffic to another port, replace the card

at the next available maintenance window.

Caution Removing a card that currently carries traffic on one or more ports can cause a traffic hit. To avoid this,

perform an external switch if a switch has not already occurred. See the “2.10.1 Protection Switching,

Lock Initiation, and Clearing” section on page 2-156 for commonly used traffic-switching procedures.

Note When you replace a card with the identical type of card, you do not need to make any changes

to the database.

Step 9 If no ports are shown bad and the alarm does not clear, log into the Technical Support Website at

http://www.cisco.com/techsupport for more information or call Cisco TAC (1-800-553-2447).

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Cisco 15310-MA Guide de dépannage Page 230