Cisco ONS 15454 Troubleshooting Manual page 186

1.12.2 Faulty Fiber-Optic Connections
c.
d.
Removing a card that currently carries traffic on one or more ports can cause a traffic hit. To avoid this,
Caution
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
information, refer to the "Maintain the Node" chapter in the Cisco ONS 15454 Procedure Guide.
If the power level on the fiber is above the range specified for the card, ensure that an ONS LR card is
Step 6
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.
To prevent overloading the receiver, use an attenuator on the fiber between the ONS OC-N card
Tip
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.
Most fiber has text printed on only one of the two fiber strands. Use this to identify which fiber is
Tip
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.
cable layout, and
Table 1-5
Figure 1-52
End view of RJ-45 plug
Cisco ONS 15454 Troubleshooting Guide, R8.5
1-142
Retest the fiber power level.
If the replacement fiber still shows no power, replace the OC-N card.
Figure 1-52
Table 1-4 shows the cable pinouts.
shows the cross-over pinouts.
RJ-45 Pin Numbers
8 7 6 5 4 3 2 1
shows the wiring of an RJ-45 connector.
Figure 1-54
1 2 3 4 5 6 7 8
Looking into an RJ-45 jack
Chapter 1 General Troubleshooting
2-262. For more
Figure 1-53 shows a LAN
shows a cross-over cable layout, and
November 2009