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A-5
Cisco ME 3400 Ethernet Access Switch Hardware Installation Guide
OL-7677-04
Appendix A Connector and Cable Specifications
Cable and Adapter Specifications
Note When using shorter distances of single-mode fiber-optic 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 than 15.43 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.
Two Twisted-Pair Cable Pinouts
Figure A-4 and Figure A-5 show the schematics of two twisted-pair cables for connecting to 10BASE-T-
and 100BASE-TX-compatible devices.
Figure A-4 Two Twisted-Pair Straight-Through Cable Schematic
Figure A-5 Two Twisted-Pair Crossover Cable Schematic
1000BASE-ZX
(GLC-ZX-SM
1550 SMF G.652
2
— 43.4 to 62 miles
(70 to 100 km)
4
CWDM 1470, 1490,
1510, 1530,
1550, 1570,
1590, 1610
SMF G.652
2
— 62 miles (100 km)
1. Modal bandwidth applies only to multimode fiber.
2. A mode-field diameter/cladding diameter = 9 micrometers/125 micrometers
3. 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).
4. 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.
Table A-1 Fiber-Optic SFP Module Port Cabling Specifications (continued)
SFP Module
Wavelength
(nanometers) Fiber Type
Core Size/Cladding
Size (micron)
Modal Bandwidth
(MHz/km)
1
Cable Distance
Switch
3 TD+
6 TD–
1 RD+
2 RD–
Router or PC
3 RD+
6 RD–
1 TD+
2 TD–
H5578
Switch
3 TD+
6 TD–
1 RD+
2 RD–
Switch
3 TD+
6 TD–
1 RD+
2 RD–
H5579