Bell Systems BT1, BT1-DDA User guide

BT1 / BT1-DDA Door Entry Telephone Interface

The BT1 Telephone interface offers the convenience of operating a door entry
system from an existing BT style telephone without interfering with its normal usage.
Most domestic tone-dial telephones are compatible with the BT1 including cordless
DECT telephones which are of great benefit to those people with limited mobility.

The interface may also be connected onto a telephone switchboard via a dedicated
trunk line input, NOT an extension connection. Please note, operation cannot be
guaranteed with every PABX available.

Operation

The BT1 interface appears transparent to the phone line, even if the BT1 is not
powered.

When a call is made from the Entrance panel the phone will ring for a maximum of 30
seconds, a ringing tone will be heard at the panel (not BT1-DDA). When the phone is
picked up the visitor can converse with the resident and operate a lock release by
pressing the 1 key to allow access. The door will be released for 3 seconds, during
which time beeps will be heard at the entrance and at the phone.

The operations below require a connection to an external phone line/network:

The resident can activate the panel without a visitor initiating the call by picking up
the handset and pressing *, then 8. The resident can then talk to anybody at the
entrance and release the door with the 1 key if necessary.

If a resident is conversing with a visitor and an external phone call is received a ring
tone will be heard in the entrance panel and phone. Pressing the * key switches
between visitor and external phone line. When the visitor is selected the phone at the
end of the other line will hear an ‘on hold’ melody. When the phone line is selected a
short warning beep is heard (or when calling from the door and on a phone call).
Pressing 1 when the visitor is selected will release the door.

Connection to the phone line

It is illegal to tamper with, or wire into, the primary master socket from the telephone
line coming into a house or office.

The BT1 must be connected between this primary master socket and any phones,
FAX, etc inside the office/house. Connection to the primary master socket must be
made using the plug provided. A new master socket (not supplied) can then be wired
to the BT1 using the diagram overleaf.

A maximum of 3 phones/devices (equivalent to a REN of 3) can be connected to the
new master socket.

Broadband / Help Systems

Any equipment/system requiring a permanent connection such as Broadband or
Help/Alarm systems must be connected to the original Master socket, NOT to the

new Master socket or BT1 output. Micro-filter(s) will be needed.

Typical Wiring

Systems with PAX1 Proximity Reader

* If a Maglock is used, a suitable transient suppressor must be fitted directly

across the Maglock.

BT1 Systems with:

200/CK200 Coded Access Control

In this case the Lock should be connected to the 200 Control unit and the Lock –
terminal on the BT1 should be connected to the EXIT + terminal on the 200
Controller to trigger lock operation. Connect the negative of any Power Supplies
together to provide a common reference. Follow the BellCode manual to wire the
Coded Keypad.

C106/CP106-n Coded Access Control

In this case the Lock should be connected to the C106 Keypad and the Lock –
terminal on the BT1 should be connected to the EXIT + terminal on the C106 to
trigger lock operation. Connect the negative of any Power Supplies together to
provide a common reference.

bell

system

(Telephones) Ltd

This product complies with European Directive 89/336/EEC on
ElectroMagnetic Compatibility and Low Voltage Directive

73/23/EEC.

Bell System (Telephones) Ltd.

Presley Way, Crownhill, Milton Keynes MK8 0ET
Tel: [phone] FAX: [phone]
email: [e-mail] or [e-mail]
website: www.bellsystem.co.uk

PD-081 Issue 4