Cabletron Systems EMC39-12 Appendix a Cable Requirements, 10BASE-T Twisted Pair Requirements

APPENDIX A

CABLE REQUIREMENTS

This appendix provides cable requirements for each of the EMC39-12 ports.

A.1 10BASE-T TWISTED PAIR REQUIREMENTS

When you connect a 10BASE-T twisted pair segment to the EMC39-12, the device at the other end of the twisted pair segment must meet IEEE

802.310BASE-T specifications. Your 10BASE-T twisted pair segment must meet the following requirements.

Segment Length

The IEEE 802.3 10BASE-T standard requires that 10BASE-T devices must be able to transmit from 0 to at least 100 meters (328 feet) per segment of 24-gauge unshielded twisted pair (UTP) cable.

Insertion Loss

The maximum insertion loss allowed for a 10BASE-T segment is 11.5 db at all frequencies between 5.0 and 10.0 MHz. This includes the attenuation of the cable, connectors, and patch panel.

Impedance

10BASE-T specifies cable impedance between 85 and 110 ohms.

A.2 SINGLE MODE FIBER OPTIC NETWORK

When connecting a single mode fiber optic link segment to a hub, ensure the network meets the following requirements:

Cable Type

Fiber optic link segments should consist of 8/125 to 12/125 ∝m single mode fiber optic cabling. You can also use 62.5/125 ∝m multimode cable however, multimode cable allows for greater optical loss, and limits the possible distance to 2 km.

EMC39-12 User’s Guide Page A-1