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11-8
Cisco 10000 Series Router Line Card Hardware Installation Guide
OL-6773-04
Chapter 11 1-Port Gigabit Ethernet Line Card Overview
Cables and Connectors
Mode-Conditioning Gigabit Ethernet Patch Cord Description
A mode-conditioning patch cord can be used with the WS-G5486 (GBIC module) to allow reliable laser
transmission between the single-mode laser source on the GBIC module 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 cable.
This degradation results in a decrease in the link span (the distance between a transmitter and a receiver)
that can be supported reliably. The effect of DMD can be overcome by conditioning the launch
characteristics of a laser source. A practical means of performing this conditioning is to use a device
called a mode-conditioning patch cord.
A mode-conditioning patch cord is an optical fiber cable assembly that consists of a pair of optical fibers
terminated with connector hardware. Specifically, the mode-conditioning patch cord is composed of a
single-mode optical fiber permanently coupled off-center (see Offset in Figure 11-4) to a graded-index
multimode optical fiber. Figure 11-4 shows a diagram of the mode-conditioning patch cord assembly.
1000BASE-LX/LH
WS-G5486
(SMF) –9.5 dBm
3
(MMF) –11.5dBm
4
–3 dBm
5
–19 dBm –3 dBm (SMF) 9.5 dBm
4
(MMF) 7.5 dBm
3
1000BASE-ZX
WS-G5487
0 dBm 5 dBm –23 dBm –3 dBm –23 dBm
1. For fiber types 50/125 mm, NA = 0.20 fiber and 62.5/125 mm, NA = 0.275 fiber.
2. For fiber types 50/125 mm MMF and 62.5/125 mm MMF.
3. For fiber types 9/125 mm SMF.
4. For fiber types 62.5/125 mm MMF and 50/125 mm MMF.
5. For fiber types 9/125 mm SMF, 62.5/125 mm MMF, and 50/125 mm MMF.
Table 11-7 Gigabit Ethernet GBIC Transmit Power, Receive Power, and Power Budget (continued)
GBIC Transmit Power Receive Power Power Budget