Cisco Systems Cisco ME 3400 manual Two Twisted-Pair Cable Pinouts

Appendix A Connector and Cable Specifications

Cable and Adapter Specifications

Table A-1	Fiber-Optic SFP Module Port Cabling Specifications (continued)
		Wavelength		Core Size/Cladding	Modal Bandwidth
SFP Module		(nanometers)	Fiber Type	Size (micron)	(MHz/km)1	Cable Distance
1000BASE-ZX		1550	SMF	G.6522	—	43.4 to 62 miles
(GLC-ZX-SM						(70 to 100 km)4
CWDM		1470, 1490,	SMF	G.6522	—	62 miles (100 km)
		1510, 1530,
		1550, 1570,
		1590, 1610

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.

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-4and Figure A-5show the schematics of two twisted-pair cables for connecting to 10BASE-T- and 100BASE-TX-compatible devices.

Figure A-4

Switch

3 TD+

6 TD–

1 RD+

2 RD–

Figure A-5

Switch

3 TD+

6 TD–

1 RD+

2 RD–

OL-7677-04

Two Twisted-Pair Straight-Through Cable Schematic

Router or PC

3 RD+ 6 RD–

1 TD+	H5578
2 TD–

Two Twisted-Pair Crossover Cable Schematic

Switch

3TD+

6TD–

1 RD+	H5579
2 RD–

Cisco ME 3400 Ethernet Access Switch Hardware Installation Guide

A-5