Cisco Systems CISCO7201 manual Attaching the Mode-Conditioning Patch Cord

Chapter 2 Installing the Cisco 7201 Router

Connecting I/O Cables

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 mode-conditioning patch cord, the SFP-GE-L= is compliant with the IEEE 802.3z standard for 1000BASE-LX.

Note We strongly recommend cleaning optical fiber connections before attaching cables to equipment. See the “Cleaning the Fiber-Optic Connections” section on page 5-14for information.

Attaching the Mode-Conditioning Patch Cord

To use a mode-conditioning patch cord, follow these steps:

Step 1 If you have not already done so, and the mode-conditioning patch cord has been in use, we strongly recommend cleaning optical fiber connections before attaching cables to equipment. See the “Cleaning the Fiber-Optic Connections” section on page 5-14for information.

Step 2 Attach a mode-conditioning patch cord to the SFP module. (See Figure 2-17.)

Step 3 Attach the network ends of your mode-conditioning patch cord to the appropriate 1000BASEX equipment in your building cable plant.

Ensure that you connect the TX and RX ports on one end of the patch cord to the RX and TX ports (respectively) on the other end. Connect TX to RX and RX to TX.

Note See Chapter 3, “Starting and Configuring the Router,” the “Configuring the Native Gigabit Ethernet Interfaces” section on page 3-15, for information on configuring and troubleshooting the Gigabit Ethernet interfaces.

Attaching the Gigabit Ethernet RJ-45 Cables

The RJ-45 ports support IEEE 802.u (Fast Ethernet) and 802.3ab (Gigabit Ethernet) twisted-pair interfaces compliant with 1000BASETX and 1000BASET specifications.

Note RJ-45 ports GE/00 and GE/01 are always set to MDI mode.

The RJ-45 ports support standard straight-through and crossover Category 5 unshielded twisted-pair (UTP) cables with RJ-45 connectors. Cisco does not supply Category 5 UTP cables; these cables are available commercially.

See Appendix A, “Specifications,” for Gigabit Ethernet RJ-45 port specifications.

Intra-Building Lightning Protection

Shielded cables, which are grounded at both ends, are required to be used on the 10/100/1000 Gigabit Ethernet RJ-45 ports in order to be in compliance with requirement R4-11 in GR-1089-Core for a Central Office environment. This is not a requirement for customer premises installations.

	Cisco 7201 Installation and Configuration Guide
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