Unshielded Twisted Pair (Utp - Cabletron Systems TRBMIM-T User Manual

This Appendix describes design and performance specifications for each
of the media types used with the TRBMIM-T.
B.1 UNSHIELDED TWISTED PAIR (UTP)
A UTP segment consists of four pairs of 24 AWG solid wire for data or
voice communication and is typically used to wire cable runs within
building walls. In some installations, existing UTP building wiring can be
used for Token Ring cabling.
DO NOT connect UTP cabling to any non-Token Ring network
conductors (i.e.,telephone) or ground. If in doubt, test wiring
before using. The voltages used in telephone circuits present a
shock hazard and can damage Token Ring equipment when
connected to Token Ring cabling.
The TPIM-T2 supports UTP cable categories 3, 4, and 5, which are
described as follows:
• Category 3 (or 10BaseT) UTP cable consists of four unshielded
twisted pairs of 24 AWG solid wire for data or voice communication.
It is typically used to wire cable runs within the walls of buildings.
Because it does not meet the minimum Near-End Crosstalk (NEXT)
tolerance for 16 Mbps Token Ring transmission, it is not
recommended for installation.
• Category 4 and 5 are enhanced versions of Category 3. Both are
composed of the same wire gauge as Category 3, but demonstrate
superior performance due to improvements in design (for example,
more twists per foot). Because of their ability to filter crosstalk and
noise at 16 Mbps, they are recommended for Token Ring installation.
Table B-1lists performance specifications for UTP cable categories 3, 4,
and 5 at Token Ring operating frequencies of 4 and 16 MHz. The values
listed include the maximum attenuation of the cables, connectors, patch
panels, and reflection losses due to impedance mismatches in the
segment.
APPENDIX B
MEDIA SPECIFICATIONS
B-1