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Gigabit Interface Converter (GBIC) Module and Small Form-Factor Pluggable (SFP) GBIC Module Installation Information and Specifications
OL-5067-08
Mode-Conditioning Patch Cord Description
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 5 and Figure 6) to a
graded-index multimode optical fiber. Figure 5 and Figure 6 show a diagram of the mode-conditioning
patch cord assembly.
Figure 5 Mode Conditioning Patch Cord Assembly with GBIC Module-Type Connector
Figure 6 Mode Conditioning Patch Cord Assembly with SFP Module-Type Connector
The mode-conditioning patch cord assembly is composed of duplex optical fibers, including a
single-mode-to-multimode offset launch fiber connected to the transmitter, and a second conventional
graded-index multimode optical fiber connected to the receiver. The use of a plug-to-plug patch cord
maximizes the power budget of multimode 1000BASE-LX and 1000BASE-LH links.
1 Beige color identifier 6 Multimode fiber
2 To GE interface 7 Single-mode fiber
3 RX 8 Offset
4 TX 9 To cable plant
5 Blue color identifier
/ / / /
/ /
TX
Offset
RX
57011
1 1
1
2
3
4 5
6
9
87 6
1 Gray color identifier 5 Single-mode bar
2 To GE interface 6 Offset
3 Blue color identifier 7 Beige color identifier
4 Multimode bar 8 To cable plant
/ / / /
/ /
TX
Offset
RX
84159
1 7
2
3 7
4
8
65 4
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