Bell BSX User Manual
Bell System (Telephones) Ltd.
BSX
DOOR ENTRY TELEPHONE EXCHANGE
Installation
and
Operation
Issue 3.00
PLEASE READ THIS MANUAL PRIOR TO INSTALLATION. IF YOU ARE NOT SURE ON
ANY INSTRUCTION PLEASE CONTACT YOUR DISTRIBUTOR FOR FURTHER
GUIDANCE
CONTENTS
1. Introduction ...................... 1
Control Unit BSX ...................... 1
The Entrance Panel ...................... 2
Model 51 Speech unit ...................... 2
Telephones ...................... 2
2. Installation Procedure ...................... 3
Cable Requirements ...................... 3
Connections to panel ...................... 5
Electric Lock Release ...................... 5
Tone Output ...................... 5
Fire Service Switch ...................... 5
Door Monitoring ...................... 6
Dual Entrance model ...................... 6
3. Testing & Troubleshooting ...................... 7
Installing the battery ...................... 8
Technical Help ...................... 9
Time Clock operation ......................10
Diagrams
1. Connections to Entrance Area CTX816 ...................... 14
2. Connections to Panel Push-buttons CTX816 ...................... 15
3. Connections to Telephones RLX816 ...................... 16
4. Connections to Entrance Area CTX864 ...................... 17
5. Connections to Panel Push-buttons CTX864 ...................... 18
6. Connections to Telephones RLX864 ...................... 19
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.
CC 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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The Entrance Panel
This is commonly a model VRP or LCP series panel, being a flush mounting stainless steel
(BS316) vandal-resistant panel. The panel is fixed by tamper-proof bolts and is to be located
on the wall adjacent to the main entrance of the dwellings. The panel can be supplied in a
variety of sizes and with custom engraving details. A single flush type vandal resistant
button is provided for each flat and one for the timed entry of Services. A grill is also engraved
into the panel which conceals the Speech unit.
Model 51 Speech Unit
The Model 51 Speech unit is recommended for use with the BSX system. It provides fullduplex speech between the front door and the telephone. It has a weather-resistant
plastic-cone loudspeaker for speech-out, and a dynamic, low frequency microphone for
speech-in. Both amplifier circuits (in and out) use a custom designed Hybrid circuit for high
reliability. The volume of each amplifier can be individually adjusted with two continuously
variable controls.
Telephones
The following telephone models are compatible with the BSX control ; 500D, 500X, 500XT,
500LX, and 500LXT.
Although the control unit will work with a variety of telephones the model 500X has been
designed specifically to take advantages of its facilities. The model 500LX telephone is
available for door monitoring having a second led to indicate when the door is open ( this
telephone requires 7 wires and must be installed with the CTX864 control ).
The model 500X telephone is completely manufactured in the UK for use in Public Housing
and specifically for the BSX system. The body is made of high impact ABS plastic, with a total
plastic moulding weight per handset being approximately 275 g. The handset cord is coiled and
has a sleeve at point of entry to the handset for longevity of life .
When called the resident needs only to pick up the handset to speak with the caller. The
speech circuitry is of high quality and includes the facility for the installation of an inductive
device to operate a hearing aid (switched to 'T') .
The telephone has a DC buzzer which is operated by an associated push button at the entrance
panel.The facility for extension bells, tones, and relays for switching lights etc. has been
included .
Residents may mute the buzzer by operating a button on the telephone; a red LED light
illuminates to remind them that the telephone is muted . Depressing the same button will
reconnect the buzzer and the red LED light will no longer be illuminated. Clear instructions
are provided on the cover. A second button on the telephone may be used to operate an
electric door release only after being called.
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Installation Procedure
Fitting the Control Unit
All of the equipment within the control unit box is mounted on a removable plate. It is important
that while the box is being drilled for cable-entry conduits and being secured to the wall that the
equipment is removed to prevent metal swarf from falling onto PCBs.
Cable Requirements
Use 0.5mm solid-core twisted-pair telephone cable (BT specification CW1308, or equivalent)
for all telephone and door panel connections; this is essential for correct operation of the
system and for compliance with European EMC Directive 89/336/EEC. Avoid running any cables
alongside mains or other data transmission wiring.
Connections to each Door Controller
(CTX PCB)
Speech Unit (Door panel) 5 0.5mm 50m
Lock release
(0.5A rating)
Exit / Fireman’s Switch or Door Open Switch 2 0.5mm 100m
Tone Output/Sounder 2 0.5mm 100m
Engage Lamp 2 0.5mm 100m
Connections to Push-buttons - as per diagrams
Connections to Telephones (full isolation)
500D Telephone 5 0.5mm 100m*
500X Telephone 6 0.5mm 100m*
500LX/500LXT Telephone 7 0.5mm 100m*
Cores Diameter Max.Length
2 0.5mm
1.0mm
25m
100m
These restrictions are unlikely to be exceeded in most circumstances; if they present a problem
please contact the Manufacturer for further advice.
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Model PSU138 Power Supply
Important Safety Information
The Model PSU138 Power Supply must be mounted in a ventilated cabinet/enclosure designed
to house 240V AC mains electrical equipment.
The cabinet must be in a protected indoor environment, close to a 240V electrical supply, e.g.
an electrical cupboard. Connections to the 240V AC mains supply must be carried out by a
qualified electrician or similar competent person, and made in accordance with accepted safety
practices. A good mains safety earth must be connected to cabinet and Power Supply. A twopole switch (as provided by a Consumer Unit or Switch-Fuse) must be included to isolate both
Live and Neutral during Installation or Maintenance. The circuit must be protected by a current
limiting fuse or other device with a maximum rating of 5A.
The transformer is protected by a fuse; always replace this with the correct type and rating:
T315mA 250V (20mm glass fuse, 315mA, 250V, Time delay, approved to
BS EN 60127 or equivalent.)
Mains Cables
Use only mains cable to BS6004, BS6500, or equivalent, within the following specified limits:
Minimum Maximum
Conductor Diameter 1.0mm (0.75mm
Cable Diameter 4.0mm 8.0mm
When fitting the cables (both primary and secondary) only feed them through the blind
grommets provided, first cutting a slit in each. Do not remove the grommets or make any other
holes.
2)
2.25mm (4mm
2)
Battery
The enclosing cabinet must be vented to avoid the build-up of gases. Do not block any vents
which maybe apparent. Care must be taken to ensure the battery terminals are not shorted
together by metal objects as this may constitute a Fire Hazard. Observe the correct polarity
when connecting:
Red wire - Positive
Black wire - Negative
The Battery is protected by a fuse, always replace this with the correct type and rating:
F3.15A 250V (20mm glass fuse, 3.15A, Fast Blow, approved to BS EN
60127 or equivalent.)
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