Bell System bellview Specifications download pdf (Page 46)

Bell View Video System

Page 2 of 6

1 - 10 Way 2 Door Systems

Cable Requirement (Refer to diagrams 5a, 5b and 5c.)

Cable types (solid core)

0.5 mm Twisted pair, e.g. BT spec CW1308

1.0 mm 1.0 mm

‘Twin & Earth’

1.4 mm 1.5 mm

‘Twin & Earth’

Co-ax 75 Ohm, RG59 or equivalent

Video phones

Total Cable Length Video Power (+,-) Other connections

(N = no. of video phones)

Video Signal

Basic Functions

25 m 9+N @ 0.5 mm [double +, -] 75 Ohm Co-ax

50 m 2 @ 1.0 mm 5+N @ 0.5 mm 75 Ohm Co-ax

100 m 2 @ 1.4 mm 7+N @ 0.5 mm [double V, O] 75 Ohm Co-ax

Basic Functions + Door Monitor Facility (L)

25 m 10+N @ 0.5 mm [double +, -] 75 Ohm Co-ax

50 m 2 @ 1.0 mm 6+N @ 0.5 mm 75 Ohm Co-ax

100 m 2 @ 1.4 mm 8+N @ 0.5 mm [double V, O] 75 Ohm Co-ax

Basic Functions + Camera Select Facility (CAM)

25 m 10+N @ 0.5 mm [double +, -] 75 Ohm Co-ax

50 m 2 @ 1.0 mm 6+N @ 0.5 mm 75 Ohm Co-ax

100 m 2 @ 1.4 mm 8+N @ 0.5 mm [double V, O] 75 Ohm Co-ax

Basic Functions + Door Monitor Facility (L) + Camera Select Facility (CAM)

25 m 11+N @ 0.5 mm [double +, -] 75 Ohm Co-ax

50 m 2 @ 1.0 mm 6+N @ 0.5 mm 75 Ohm Co-ax

100 m 2 @ 1.4 mm 9+N @ 0.5 mm [double V, O] 75 Ohm Co-ax

E.g. 10 Video phones with basic functions over a 50 m length requires; 2 common conductors @

1.0 mm, 5 common conductors @ 0.5 mm and 10 individual call lines @ 0.5 mm.

Notes

Assumes only 1 video phone is active at a time and the phones are distributed evenly along the cable run.

Loop the coaxial cable from phone to phone (daisy-chain wiring). Do not run a separate cable from each video phone back to

a common junction (star wiring).

Where possible (for optimum speech clarity), a twisted-pair should be used for ‘R’ and ‘O’ connections.

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Bell System bellview Specifications Page 46