Cisco Systems 6500 manual Rx Tx

Chapter 3 Installing Ethernet Switching Modules

Attaching the Network Interface Cables

Figure 3-8 Mode Conditioning Patch Cord with LC (SFP Transceiver) Connector

	4
1	/ /	7
/ /		/ /
	Offset

2

RX TX

3 5 6 4 7

8

84159

1	Gray color identifier	2	To gigabit Ethernet interface
3	Blue color identifier	4	Multimode fiber
5	Single-mode fiber	6	Offset junction
7	Beige color identifier	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 1000BASE-LX/LH 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 end of the patch cord, the GBIC-LX/LH is compliant with the IEEE 802.3z standard for 1000BASE-LX.

Catalyst 6500 Series Ethernet Modules Installation Guide

3-14 OL-6265-04