3-23
Cisco 7200 VXR Installation and Configuration Guide
OL-5013-09
Chapter 3 Installing a Cisco 7200 VXR Router
Connecting I/O Controller, NPE-G1, or NPE-G2 Cables
Table 3-4 provides NPE-G2 CWDM SFP module configuration information.
Mode-Conditioning Patch Cord Description
A mode-conditioning patch cord can be used with the SFP-GE-L= (SFP module) to allow reliable laser
transmission between the single-mode laser source on the SFP 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 3-17) to a graded-index
multimode optical fiber. Figure 3-17 shows a diagram of the mode-conditioning patch cord assembly.
Ta b l e 3-4 NPE-G2 CWDM SFP Module Configurations
CWDM Product Number Color
CWDM-SFP-1470 Gray
CWDM-SFP-1490 Violet
CWDM-SFP-1510 Blue
CWDM-SFP-1530 Green
CWDM-SFP-1550 Yel low
CWDM-SFP-1570 Orange
CWDM-SFP-1590 Red
CWDM-SFP-1610 Brown
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