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Chapter 5 - Installing the CAB 4n
Pin outs
The RS-485 connector has two sets of terminations that are wired in parallel. This allows you
to bus adjacent serial data connections at each network location. With this type of connection,
there is no input or output.
CAT 5 connections
Category 5 cable, or CAT 5 as it is commonly known, is a wiring standard that consists of 8
conductors, identified into 4 pairs, and although only two of these pairs are used, all four are
terminated.
It is a UTP (Unshielded Twisted Pair) configuration. The cable is coupled to in-line RJ-45
connectors, also a Bell/AT&T standard. Special crimping tools are required to make the
termination; these are widely available, as are the connectors.
Note: A ratcheting type crimping tool is highly recommended. The use of non-ratcheting
crimping tools, while occasionally adequate, typically results in considerably higher failure
rates for field terminated connections.
Just like telco wire, there are stranded and solid varieties of CAT 5 cable. This is important to
know, because the RJ-45 connector is different for each type of wire. The standard bent tine
connector is intended for use with solid core wire, and the aligned tine connector is for use
with standard wire. The bent tine connector will generally work on stranded wire, but not the
other way around.
The EIA standard requires no more than 1/2 inch be left untwisted. More than 1/2 inch of
untwisted cable will affect performance at high bit rates. Although only 2 of the 4 twisted pairs
are used for Ethernet, it is important that all pairs be terminated, and that the conductors be
twisted together in pairs. The illustrations should give you the basics for getting your cables,
and your audio system up and running. Although pre-made, molded style cables are preferred,
they can be impractical, since your cabling route, distance and locations are based on the
jobsite conditions and not your test bench.
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Version 1.6.4b.1
June 11, 2012
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