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Cisco ONS 15454 Troubleshooting Guide, R8.5
November 2009
Chapter 1 General Troubleshooting
1.12.2 Faulty Fiber-Optic Connections
c. Retest the fiber power level.
d. If the replacement fiber still shows no power, replace the OC-N card.
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 procedures in the
“2.9.2 Protection Switching, Lock Initiation, and Clearing” section on page 2-262. For more
information, refer to the “Maintain the Node” chapter in the Cisco ONS 15454 Procedure Guide.
Step 6 If the power level on the fiber is above the range specified for the card, ensure that an ONS LR card is
not being used when an ONS 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 too powerful for the receiver on the receiving OC-N 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 OC-N card
transmitter and the receiver. Place the attenuator on the receive transmitter of the ONS OC-N 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.
1.12.2.1 Crimp Replacement LAN Cables
You can crimp your own LAN cables for use with the ONS 15454. Use a cross-over cable when
connecting an ONS 15454 to a hub, LAN modem, or switch, and use a LAN cable when connecting an
ONS 15454 to a router or workstation. Use Category-5 cable RJ-45 T-568B, Color Code (100 Mbps),
and a crimping tool. Figure 1-52 shows the wiring of an RJ-45 connector. Figure 1-53 shows a LAN
cable layout, and Table 1-4 shows the cable pinouts. Figure 1-54 shows a cross-over cable layout, and
Table 1-5 shows the cross-over pinouts.
Figure 1-52 RJ-45 Pin Numbers
55048
87654321 12345678
End view of RJ-45 plug Looking into an RJ-45 jack
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