Cisco Catalyst 3560 Hardware Installation Manual page 69

Chapter 3 Switch Installation
Table 3-1 Fiber-Optic SFP Module Port Cabling Specifications (continued)
SFP Module
CWDM
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).
2. 1000BASE-ZX SFP modules can send data up to 62 miles (100 km) by using dispersion-shifted SMF or low-attenuation
SMF; the distance depends on the fiber quality, the number of splices, and the connectors.
Note
78-16057-01
Wavelength
(nanometers) Fiber Type
1470, 1490, SMF
1510, 1530,
1550, 1570,
1590, 1610
When using shorter distances of single-mode fiber cable, you might need to insert
an inline optical attenuator in the link to avoid overloading the receiver.
When the fiber-optic cable span is less than15.43 miles (25 km), you should insert
a 5-decibel (dB) or 10-dB inline optical attenuator between the fiber-optic cable
plant and the receiving port on the 1000BASE-ZX SFP module at each end of the
link.
• Operating environment is within the ranges listed in
Specifications."
Clearance to front and rear panels is such that
•
Front-panel indicators can be easily read.
–
Access to ports is sufficient for unrestricted cabling.
–
Rear-panel power connector is within reach of an AC power receptacle.
–
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.
Modal
Core Size Bandwidth
(micron) (MHz/km)
9/125 —
Catalyst 3560 Switch Hardware Installation Guide
Preparing for Installation
Cable Distance
62 miles (100 km)
Appendix A, "Technical
3-9