bell
issimo
1 Way Video Entry System
PD-097 Issue 4
Installation and Operating Manual
Page 11 of 40
Junc tion
box
To more
phones
To
BSC4
3m
Max
Cable Specification.
All system wiring must be carried out using
Cat5
signal cable and where necessary 1mm²
(or greater) power cable as tabulated below. Cat5 cable has a known performance for the
transmission of video signals, whilst telephone or alarm cables are not suitable.
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 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.
UTP “patch cables” are
not
recommended.
NOTE: Cat5 cable is easily identifiable as the specification is printed on the sheath
Patch cable is used for the desk phone to wall connection as this requires a flexible cable.
The reason for not using it for general wiring is that attenuation is higher and video
distances would be reduced by at least ½, it also costs 2 to 3 times as much as standard
Cat5.
Spurs. A daisy chain run with one or more spurs of up to 3 metres is allowed. For
example a desk phone connection.
