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Cisco ONS 15454 SDH Troubleshooting Guide, R5.0
July 2005
Chapter 1 General Troubleshooting
1.12.2 Faulty Fiber-Optic Connections
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 15454 SDH Procedure Guide Chapter 15, “Maintain the
Node.” If possible, do this for the optical card you are working on and the far-end card.
c. Retest the fiber power level.
d. If the replacement fiber still shows no power, replace the optical card.
Step 6 If the power level on the fiber is above the range specified for the card, ensure that an ONS 15454 SDH
LR card is not being used when an ONS 15454 SDH IR card is appropriate.
LR cards transmit a higher output power than IR cards. When used with short runs of fiber, an LR
transmitter is be too powerful for the receiver on the receiving optical card.
Receiver overloads occur when maximum receiver power is exceeded.
Tip To prevent overloading the receiver, use an attenuator on the fiber between the ONS 15454 SDH optical
card transmitter and the receiver. Place the attenuator on the receive transmitter of the ONS 15454 SDH
optical cards. Refer to the attenuator documentation for specific instructions.
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.
Crimp Replacement LAN Cables
You can crimp your own LAN cables for use with the ONS 15454 SDH.
Use Category-5 cable RJ-45 T-568B, Color Code (100 Mbps) and a crimping tool. Use a cross-over cable
when connecting an ONS 15454 SDH to a hub, LAN modem, or switch, and use a LAN cable when
connecting an ONS 15454 SDH to a router or workstation.
Figure 1-52 shows the layout of an RJ-45 connector.
Figure 1-52 RJ-45 Pin Numbers
Figure 1-53 shows a LAN cable layout.
55048
87654321 12345678
End view of RJ-45 plug Looking into an RJ-45 jack
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