Cisco 6513 - Catalyst Switch Installation Manual page 202

Attaching the Network Interface Cables
Figure 3-18
2
RX
1
Gray color identifier
3 Blue color identifier
5 Single-mode fiber
7 Beige color identifier
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
3-24
Mode Conditioning Patch Cord with LC (SFP Transceiver) Connector
1
TX
3
4
/ /
/ / / /
Offset
5 6 4
2
To gigabit Ethernet interface
4 Multimode fiber
6 Offset junction
8 To cable plant
Chapter 3 Installing Ethernet Switching Modules
7
7
8
OL-6265-03