User guide

Appendix C: UTP Cabling
This appendix discusses various aspects of connection media. The performance of a MergePoint Unity switching
system depends on high quality connections. Poor quality or poorly installed or maintained cabling can diminish
MergePoint Unity switching system performance. MergePoint Unity switching systems utilize UTP cabling.
NOTE: This appendix is for information purposes only. Please consult with your local code officials and/or cabling consultants prior to
any installation.
UTP copper cabling
The following are basic definitions for the three types of UTP cabling that the MergePoint Unity switch
supports:
• CAT 5 UTP (4-pair) high performance cable consists of twisted pair conductors, used primarily for data
transmission. The twisting of the pairs gives this cable some immunity from the infiltration of unwanted
interference. CAT 5 cable is generally used for networks running at 10 or 100 Mbps.
• CAT 5E (enhanced) cable has the same characteristics as CAT 5, but is manufactured to somewhat more
stringent standards.
• CAT 6 cable is manufactured to tighter requirements than CAT 5E cable. CAT 6 has higher measured
frequency ranges and significantly better performance requirements than CAT 5E cable at the same
frequencies.
Wiring standards
There are two supported wiring standards for 8-conductor (4-pair) RJ-45 terminated UTP cable: EIA/TIA 568A
and B. These standards apply to installations utilizing CAT 5, 5E and 6 cable specifications. The MergePoint
Unity switching system supports either of these wiring standards. Table C.1 describes the standards for each pin.
Pin EIA/TIA 568A EIA/TIA 568B
1 white/green white/orange
2 green orange
3 white/orange white/green
4 blue blue
5 white/blue white/blue
6 orange green
7 white/brown white/brown
8 brown brown
Table C.1: UTP Wiring Standards
Cabling installation, maintenance and safety tips
The following is a list of important safety considerations that should be reviewed prior to installing or
maintaining your cables:
• Keep all UTP runs to a maximum of 30 feet each.
• Maintain the twists of the pairs all the way to the point of termination, or no more than one-half inch
untwisted. Do not skin off more than one inch of the jacket while terminating.
Appendices 59