2-19
Cisco 7401ASR Installation and Configuration Guide
OL-5419-01 B0
Chapter2 Rack-Mounting, Tabl et op Installation, and Cabling Connecting I/O Cables
Figure2-13 GBIC Port Connections
Step1 Remove the plug from the GBIC so that you can insert the cables. Keep the plug for use should you ever
disconnect the optical fiber cables.
Warning
Because invisible laser radiation may be emitted from the aperture of the port when no fiber cable is
connected, avoid exposure to laser radiation and do not stare into open apertures.
Step2 Attach the appropriate optical fiber cable directly to the SC-type receptacle on the GBIC. You can use
either simplex or duplex connectors for most devices. (Figure 2-13 shows a GBIC installed in GE
port 0.)
•For simplex connectors, two cables are required, one cab le for transm it (TX) and a se cond cable for
receive (RX).
•For duplex connectors, only one cable that has both TX and RX connectors is required.
A mode-conditioning patch cord can be used with the GBIC-LX/LH or WS-G5486 to allow reliabl e laser
transmission between the single-mode laser source on the GBIC and a multimode optical fiber cab le. See
the “Attaching the Mode-Conditioning Patch Cord” section on page 2-21 for installation instructions.
Mode-Conditioning Patch Cord Description
A mode-conditioning patch cord can be used with the GBIC-LX/LH or WS-G5486 to allow reliabl e laser
transmission between the single-mode laser source on the GBIC and a multimode optical fiber cable.
When an unconditioned laser source designed for operation on single-mode optical fiber is directly
coupled to a multimode optical fiber cable, an effect known as differential mode delay (DMD) might
result in a degradation of the modal bandwidth of the optical fiber ca ble.
1To external 1000BASEX network 5TX (GE port 0)
21 duplex connector (TX and RX) 6RX (GE port 0)
3To external 1000BASEX network 7GE port 1
42 simplex connectors
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