Cisco Systems CISCO7201 Manual De Usuario

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.

We strongly recommend cleaning optical fiber connections before attaching cables to equipment. See the 

 for information.

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

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 

 for information.

Attach a mode-conditioning patch cord to the SFP module. (See 

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.

See 

 the 

, for information on configuring and troubleshooting the Gigabit 

Ethernet interfaces.

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

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 

 for Gigabit Ethernet RJ-45 port specifications.

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.