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Bell System bellview Manual Online: model bv video telephone, Model 61 Speech Unit, Model Bv700 Camera. Size Fixing Supply Voltage Current Consumption Call Bell. Technical Support. System. Tel 0845 121 4008. (Telephones) Ltd 61 Speech unit – 12V AC or DC operation out the model is a 500PD.Bell System Wiring for DDA Extended Halo Systems (Telephones) Ltd DDA-EXT-1/VR(S) Flats Telephone Models: 801 801S 801PS 500D 500PD Z T Door Panel Phone O R CS106 Series combined coded access and door entry system. integral C106 keypad and are surface fitting only and include the model 61 speech unit. Bell System (Telephones) Ltd. bellissimo Installation and Operating Manual. Page 2 of 40 Check model 61 speech unit is the right way round and. 51/61. 500D. Telephone Models: 500D 500PD. Wiring Diagram for DC Door Entry Systems. 13:4456. -. +. CO. NO. NC. TS2000. Time Clock. System. M340.