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C578M-A (4/05) 39
In either case, Pelco recommends using a cable similar to Belden 9843, that meets or exceeds the support requirements for TIA/EIA-422 ap-
plications. TableA4-A is taken directly from the FULL TECHNICAL SPECS page in Belden’s Cable Catalog located on their company web site.
Table A4-A. (TIA/EIA-422*) Cable Example
JACKET
SHIELD
INSULATION
3-PAIR
TWISTED
TINNED COPPER
STRANDED
24 AWG WIRE
EXAMPLE: BELDEN 9843
20096
9843
AWG STRANDED TYPE INSULATION
24 (7 X 32) TC – Tinned Copper PE – Polyethylene
SHIELD JACKET # PAIR # TRIADS
Aluminum Foil-Polyester PVC – Polyvinyl Choride 3 0
Tape/Braid Shield
NOMINAL INSULATION JACKET NOMINAL NOMINAL NOMINAL VELOCITY NOMINAL
OD (in.) THICKNESS (in.) THICKNESS CAPACITANCE (pF/ft) CONDUCTOR DCR (/M’) OF PROPAGATION (%) IMPEDANCE (ohms)
.3600 .00000 .0000 12.800 24.000 66.0 120.0
* TIA/EIA-422-B is the full name of the current standard for what is commonly referred to as RS-422. The prefix “RS”, which stands for
“recommended standard”, was used by the EIA (Electronic Industries Association) as the name for some of its standards. The “RS-” prefix
was dropped by the EIA in 1986 and standards were simply referred to with the EIA- prefix. In 1988 TIA (Telecommunication Industries
Association) was a working group of the EIA and the reference evolved to a combined EIA/TIA- prefix. When TIA became ANSI (American
National Standards Institute) accredited, the acronym order was reversed to TIA/EIA-. In 1992 TIA spun off from EIA and merged with US
Telecommunications Suppliers Association (USTSA). From about that time to the present, the full standard has been referenced as ANSI/
TIA/EIA-422-B, where “B” is the latest revision of the standard. Normally the standard is written simply as TIA/EIA-422. In all probability, that
will be shortened to just TIA-422, at some point in the future. However, everyone has used the “RS-” prefix reference for so long that it may
be some time before its use disappears, if at all.