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Bell View Video System
Page 2 of 4
1 Way Single Door Systems
Cable Requirement (Refer to diagrams 2a and 2b.)
Cable types (solid core)
0.5 mm Twisted pair, e.g. BT spec CW1308
1.0 mm 1.0 mm
2
‘Twin & Earth’
Co-ax 75 Ohm, RG59 or equivalent
Video phones
Total Cable Length Power (+,-) Other connections
Video Signal
50 m 8 @ 0.5 mm [double +, -] 75 Ohm Co-ax
100 m 2 @ 1.0 mm 4 @ 0.5 mm 75 Ohm Co-ax
e.g. A Video phone with a 50 m length requires ; 8 conductors @ 0.5 mm.
Entrance
Connections No. of Cores Max
Length
Solid Core
Diameter
Camera + Speech unit + Call Button 5 + 75 Ohm Co-ax 50 m 0.5 mm
Lock Release (up to 0.5 A) 2 25 m
100 m
0.5 mm
1.0 mm