Cisco Systems 7200 VXR manual Gigabit Ethernet GBIC Connections, 3-24

Chapter 3 Installing a Cisco 7200 VXR Router

Connecting I/O Controller, NPE-G1, or NPE-G2 Cables

Figure 3-17 Mode-Conditioning Patch Cord Assembly for an SFP Module

4

1

/ /

2

RX TX

/ /

Offset

7

/ /

8

3 5 6 4 7

84159

1	Gray color identifier	5	Single-mode bar
2	To Gigabit Ethernet interface	6	Offset
3	Blue color identifier	7	Beige color identifier
4	Multimode bar	8	To cable plant

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 1000BASELX and 1000BASELH links.

Note The mode-conditioning patch cord is required to comply with IEEE standards. The IEEE found that link distances could not be met with certain types of fiber-optic cable cores. The solution is to launch light from the laser at a precise offset from the center, which is accomplished by using the mode-conditioning patch cord. At the output of the patch cord, the SFP-GE-L= is compliant with the IEEE 802.3z standard for 1000BASELX.

Note We strongly recommend cleaning optical fiber connections before attaching cables to equipment. See the “Fiber-Optic Cleaning Information” section on page 5-10for information.

Gigabit Ethernet GBIC Connections

The Gigabit Interface Converter (GBIC) port is a 1000-Mbps optical interface in the form of an SC-type duplex port that supports IEEE 802.3z interfaces compliant with the 1000BASEX standard. (See Figure 3-18.)

Note The GBIC is a separately orderable part and does not ship installed in your I/O controller. You must install the GBIC before you connect the cables to it.

Figure 3-18shows the simplex and duplex SC-type connectors on your multimode or single-mode fiber-optic cables. For simplex connectors, two cables are required, one cable for transmit (TX) and a second cable for receive (RX). For duplex connectors, one cable that has both TX and RX connectors is required. You can use either simplex or duplex connectors for the C7200-I/O-GE+E or the NPE-G1.

Cisco 7200 VXR Installation and Configuration Guide

3-24 OL-5013-09