User's Manual

PN 9000-10 InterReach Unison Accel Installation, Operation, and Reference Manual A-1
620021-0 Rev. A
APPENDIX A Cables and Connectors
A.1 Cat-5/6 Cable (ScTP)
• Connects the Accel Hub to the RAU(s)
• Transmits (downlink) and receives (uplink) IF signals
• Delivers DC electrical power to the RAUs. The Accel Hub’s DC voltage output is
36V DC nominal. A current limiting circuit is used to protect the Hub if it reaches
its current limit
• Carries configuration and status information
• Use shielded RJ-45 connectors
• Distances:
• Minimum: 10 meters (33 ft)
• Recommended Maximum: 100 meters (328 ft)
• Absolute Maximum: 150 meters (492 ft)
There are four separate twisted pairs in one Cat-5/6 screened twisted pair (ScTP)
cable. The ScTP cable loss described in this document is for Cat-5 Mohawk/CDT
55986 or Belden 1624P DataTwist Five cable, or equivalent. The following table lists
the functional assignment of the pairs:
Table A-1 Cat-5/6 Twisted Pair Assignment
Pair (wire number) Function
1 & 2 Clock and Input Voltage
3 & 6 RS-485
4 & 5 Uplink IF, UL Pilot and Ground
7 & 8 Downlink IF, DL Pilot and Ground