Bell System bellview Specifikace stáhnout pdf (Strana 23)

Bell View Video System

Page 2 of 5

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

‘Twin & Earth’

Co-ax 75 Ohm Low loss, e.g. CT100, RG6

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.

Note

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

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

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Bell System bellview Specifikace Strana 23