Twisted Pair Copper Cable; Utp - Cabletron Systems MicroMMAC-22T User Manual

This Appendix describes design and performance specifications for each
of the media types used with the MicroMMAC-T.
C.1 TWISTED PAIR COPPER CABLE
Twisted pair copper cable is used for baseband data transmission. It
consists of multiple pairs of entwined solid copper wire strands that are
each encased in an insulating material within an outer protective sheath.
In contrast to unshielded twisted pair (UTP), shielded twisted pair (STP)
cable pairs are also encased in a metallic, conducting material designed to
block out intrusive outside electrical signals that can interfere with signal
traffic on the cable.
C.1.1 UTP
The MicroMMAC-22T/24T lobe ports and the TPIM-T2 support 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.
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 an enhancement in their design (more
twists per foot). Because of their ability to filter crosstalk and noise at
16 Mbps, they are recommended for Token Ring installation.
Table C-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 C
MEDIA SPECIFICATIONS
C-1