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This appendix gives cable requirements for each of the EMC39-12 ports.
A.1
10BASE-T TWISTED PAIR REQUIREMENTS
When a 10BASE-T twisted pair segment is connected to the EMC39-12,
the device at the other end of the twisted pair segment must meet IEEE
802.3 10BASE-T specifications.
The 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
The IEEE 802.3 10BASE-T standard 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. 50/125 to 62.5/125 m multimode cable may
also be used, however, multimode cable has greater optical loss, and
limits the possible distance to 2 km.
EMC39-12 User's Guide
APPENDIX A
CABLE REQUIREMENTS
A-1
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