Download Bell System 500D Specifications

Introduction
The BSX Door Entry Telephone System is designed for low rise blocks of flats. It provides the
means for visitors to call an individual resident within the building and to establish two-way
speech communication (full duplex) with them. The resident is allowed full control over the
callers' access to the main entrance by means of an electric lock release or an electric lock.
The BSX includes a sophisticated microprocessor-based Control Unit which operates on the
'Telephone Exchange' principle. This approach has two main advantages over common-wired
entry phone systems ;
C
Conversations are totally private.
C
Any damage sustained to an individual telephone or its associated cable will not affect
the operation of the rest of the system .
Various models of front door pane and telephones may be used with the BSX equipment.
The Control Unit
The BSX Control unit is available in multiples of 8 up to 56 stations, and then a 63 station
control. (The DAX digital system is available for systems up to 256 stations). Multi entrance
systems are available with an additional CTX Control board for each entrance.
C
A CTX816 control board is used for systems up to 16 stations ( except when door
monitoring telephones are used).
*
A CTX864 control board is used for any other system, or for any system using
telephones with door monitoring.
All the control equipment is installed in a lockable steel cabinet and mounted onto a subchassis which can easily be removed from the cabinet to allow the installer to cut holes for
cable/conduit entry. The Control unit includes the following;
Model PSU138A or PSU138B Power Supply
Model CTX Door Controller
Model RLX Relay boards
Model TS2000 quartz reserve time-clock
A 12v 6A/H battery when standby is required (Optional)
Connections to each telephone are protected with relays and fuses and have a diagnostic led
indication .
Provision has been made for either Fail-Secure or Fail-Safe electric lock releases or electric
locks to be used. The time duration of door release operation is programmable .
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