1?for 10/100 and 10/100/1000 ports, cable lengths from the switch to connected devices are up to 328 feet (100 meters).
2?copper 1000base-t sfp modules use standard four twisted-pair, category 5 cable at lengths up to 328 feet (100 meters).
3?table 3-1 lists the cable specifications for 1000base-sx and 1000base-lx fiber-optic sfp connections. each port must match the wave-length specifications on the other end of the cable, and the cable must not exceed the stipulated cable length for reliable communications.
table 3-1 fiber-optic sfp module port cabling specifications
1. a mode-conditioning patch cord is required. using an ordinary patch cord with mmf, 1000base-lx/lh sfp modules, and a short link distance can cause transceiver saturation, resulting in an elevated bit error rate (ber). when using the lx/lh sfp module with 62.5-micron diameter mmf, you must also install a mode-conditioning patch cord between the sfp module and the mmf cable on both the sending and receiving ends of the link. the mode-conditioning patch cord is required for link distances greater than 984 feet (300 m).
1?operating environment is within the ranges listed in appendix a, "technical specifications."
2?clearance to front and rear panels is such that
(1) front-panel indicators can be easily read.
(2) access to ports is sufficient for unrestricted cabling.
make sure that there is access to the rear of the rack if you are planning to stack the switches. if you do not have access to the rear panel, make sure you cable the switches before you rack mount them.
(3)?rear-panel power connector is within reach of an ac power receptacle.
3?cabling is away from sources of electrical noise, such as radios, power lines, and fluorescent lighting fixtures. make sure the cabling is safely away from other devices that might damage the cables.
4?airflow around the switch and through the vents is unrestricted.
5?temperature around the unit does not exceed 113°f (45℃).
if the switch is installed in a closed or multirack assembly, the temperature around it might be greater than normal room temperature.