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Cisco ONS 15310-CL and Cisco ONS 15310-MA Troubleshooting Guide, R7.0
Chapter 1 General Troubleshooting
1.11.2 Faulty Fiber-Optic Connections
Step 5 If no power level shows on the fiber, the fiber is bad or the transmitter on the optical port failed. Complete
the following steps:
a. Check that the Tx and Rx fibers are not reversed. LOS and EOC alarms normally accompany
reversed Tx and Rx fibers. Switching reversed Tx and Rx fibers clears the alarms and restores the
signal.
b. Clean or replace the fiber patchcords. Clean the fiber according to site practice or, if none exists,
follow the procedure in the Cisco ONS 15310-CL and Cisco ONS 15310-MA Procedure Guide. If
possible, do this for the card you are working on and the far-end card.
c. Retest the fiber power level.
Tip Most fiber has text printed on only one of the two fiber strands. Use this to identify which fiber is
connected to Tx and which fiber is connected to Rx.
1.11.2.1 Crimp Replacement LAN Cables
You can crimp your own LAN cables for use with the system. Use #22 or #24 AWG shielded wire with
RJ-45 connectors and a crimping tool.
Use a cross-over cable when connecting an ONS 15310-CL or ONS 15310-MA to a hub, LAN modem,
or switch, and use a LAN cable when connecting a node to a router or workstation.
Figure 1-5 shows the layout of an RJ-45 connector.
Figure 1-5 RJ-45 Pin Numbers
Figure 1-6 shows the layout of a LAN cable.
55048
87654321 12345678
End view of RJ-45 plug Looking into an RJ-45 jack