Bellcall Digital Door Entry System
PD-083 Issue 3A
Installation and Operating Manual
Page 10 of 46
Cable Specification.
DO NOT USE Alarm cable.
All system wiring must be carried out using either
Cat5
signal or
CW1308
telephone cable
and where necessary 1mm² (or greater) power cable as tabulated below. Cat5 cable is
strongly recommended as it has a better performance and may allow future upgrades with
less re-cabling.
Bell System will be unable to offer any warranty or support for systems installed
using incorrect cables.
Cat5 Cable Specification
Cat5 is our short reference for EIA standard UTP Category 5 Unshielded Twisted Pair data
cable. This is a standard 0.5mm diameter 0.2mm² solid core twisted pair cable having 4
pairs (8–cores) and no shield. The cores are in pairs where Blue and ‘Blue with a White
stripe’ are twisted together as the first pair. The other three pairs are similar with main
colours Orange, Green and Brown.
Also available and acceptable are:
UTP Category 5e (Cat5e)
UTP Category 6 (CAT6)
UTP Category 6e (CAT6e)
The exact cable can be chosen from the above on cost and availability grounds.
STP (Shielded Twisted Pair) cables are
not
recommended.
NOTE: Cat5 cable is easily identifiable as the specification is printed on the sheath.
UTP Patch cable is normally more expensive, but is otherwise suitable for audio and data
use.
CW1308 Cable Specification
CW1308 is the international standard for telephone cable which is available in sizes from 1
pair to in excess of 25 pair. The standard CW1308 has 0.5mm diameter 0.2mm² cores.
Different grades are available including a cheaper 0.4mm diameter 0.12mm² core and a
1.38mm diameter 1.5mm² core for long distance, though these are not normally available
through common outlets. All our calculations are based on the 0.5mm diameter cores
which are the same as Cat5 cores.
Cable Dimensions
Cable Types
0.5mm dia. = 0.2mm
2
Solid core twisted pair, Cat5 or BT Spec. CW1308
1.12mm dia = 1.0mm
2
1.0mm
2
, e.g. ‘Twin & Earth’ or flexible cord
