Cisco ONS 15454 SDH Specifications Page 114

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Cisco ONS 15454 SDH Troubleshooting and Maintenance Guide, R3.3
May 2002
Chapter 2 General Troubleshooting
Fiber and Cabling
Tip To prevent overloading the receiver, use an attenuator on the fiber between the ONS STM-N card
transmitter and the receiver. Place the attenuator on the receive transmitter of the ONS STM-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.
Procedure: Replace Faulty Gigabit Interface Converters
Gigabit interface converters (GBICs) are hot-swappable input/output devices that plug into a Gigabit
Ethernet port to link the port with the fiber-optic network. Cisco provides two GBIC models: one for
short-reach applications, 15454-GBIC-SX, and one for long-reach applications, 15454-GBIC-LX. The
short-reach, or “SX” model, connects to multimode fiber and has a maximum cabling distance of 1804
feet. The long-reach, or “LX” model, requires single-mode fiber and has a maximum cabling distance of
10000.5 metres (32,810 feet).
GBICs can be installed or removed while the card and shelf assembly are powered and running. GBIC
transmit failure is characterized by a steadily blinking Fail LED on the Gigabit Ethernet
(E1000-2/E1000-2-G) card. Figure 2-14 shows a GBIC.
Figure 2-14 A gigabit interface converter (GBIC)
Warning
Class 1 laser product
Warning
Invisible laser radiation may be emitted from the aperture ports of single-mode fiber optic modules
when a cable is not connected. Avoid exposure and do not stare into open apertures.
Step 1 Disconnect the network interface fiber-optic cable from the GBIC SC connector and replace the
protective plug.
Step 2 Release the GBIC from the card interface by simultaneously squeezing the two plastic tabs, one on each
side of the GBIC.
Step 3 Slide the GBIC out of the Gigabit Ethernet front-panel slot.
11825
Receiver Transmitter
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