Faulty Fiber-Optic Connections; Verify Fiber-Optic Connections - Cisco ONS 15454 Troubleshooting Manual

Chapter 1 General Troubleshooting

1.10.2 Faulty Fiber-Optic Connections

Symptom
Table 1-39
Table 1-39 Faulty Fiber-Optic Connections
Possible Problem
Faulty fiber-optic
connections.
Faulty CAT-5 cables.
Faulty Gigabit Interface
Converters (GBIC).
Warning Follow all directions and warning labels when working with optical fibers. To prevent eye damage,
never look directly into a fiber or connector. Class IIIb laser. Danger, laser radiation when open. The
OC-192 laser is off when the safety key is off (labeled 0). The laser is on when the card is booted and
the safety key is in the on position (labeled 1). The port does not have to be in service for the laser to
be on. Avoid direct exposure to the beam. Invisible radiation is emitted from the aperture at the end
of the fiber optic cable when connected, but not terminated.

Verify Fiber-Optic Connections

Step 1 Ensure that a single-mode fiber connects to the ONS 15454 OC-N card.
Note
Step 2 Ensure that the connector keys on the SC fiber connector are properly aligned and locked.
Step 3 Check that the single-mode fiber power level is within the specified range:
a.
b.
c.
d.
e.
November 2004
A line card has multiple SONET/DWDM alarms and/or signal errors.
describes the possible problems and the solutions.
Solution
Faulty fiber-optic connections can be the source of SONET/DWDM alarms
and signal errors. Complete the
on page
Faulty CAT-5 cables can be the source of SONET/DWDM alarms and signal
errors. Complete the
page
Faulty GBICs can be the source of SONET/DWDM alarms and signal errors.
See the
page
SM or SM Fiber should be printed on the fiber span cable. ONS 15454 OC-N cards do not use
multimode fiber.
Remove the Rx end of the suspect fiber.
Connect the receive end of the suspect fiber to a fiber-optic power meter, such as a
GN Nettest LP-5000.
Determine the power level of fiber with the fiber-optic power meter.
Verify the power meter is set to the appropriate wavelength for the OC-N card being tested (either
1310 nm or 1550 nm depending on the specific card).
Verify that the power level falls within the range specified for the card if it is an OC-N card; see the
"1.10.3 OC-N Card Transmit and Receive Levels" section on page
"Verify Fiber-Optic Connections" procedure
1-95.
"1.10.2.1 Crimp Replacement LAN Cables" section on
1-97.
"1.10.2.2 Replace Faulty GBIC or SFP Connectors" section on
1-98.
Cisco ONS 15454 Troubleshooting Guide, R4.6
1.10.2 Faulty Fiber-Optic Connections
1-102.
1-95