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This model is designed and approved for connection to the following circuits.
British Telecom Public Switched Telephone Network
Hull Public Switched Telephone Network
PABX Extensions
Mercury Communications Limited Public Switched Telephone Network.
CONNECTION TO THE PSTN OR A PABX EXTENSION
If there is a line jack socket already installed, you may connect this model using the line lead
supplied. If you require a socket to be fitted, complete the attached from and send it to your local
telephone manager's office.
1. The connection to the BT network must be unplugged before the earth is disconnected.
2. The connection to the BT network must not be hard wired.
3. Please ensure that connection to the mains supply (240Vac) is correctly made and that the
power is switched on before use.
4. The apparatus is suitable for direct connection to exclusive lines of a Public Switched Tele-
phone Network, and for connection to compatible PABX's (consult your authorised dealer for
the list of compatible PABX's and for installation thereon), or via an RBS.
The definition of an RBS (Relevant Branch System) for PSTN lines, is given in BS6789 section
6.1, clause 2.4.
5. When idle, this model allows normal use of an associated approved main telephone, which
must be plugged into the BS6312 compatible series connector, provided for connection to the
telephone line. Only one such connection may be made.
6. The apparatus must be connected to PSTN line which use the loop disconnect or DTMF sig-
naling.
7. The machine is not suitable as an extension to payphone, for use on shared service lines, or on
1-1 carrier systems.
8. The Terminal operates in mode 1 (autodialing).
9. The user is advised to check all numbers stored in the register before making a call.
10. The approval of this terminal for connection to the British telecom public switched telephone
network is INVALIDATED if the apparatus is subject to any modification in any material way not
authorised by BABT or it is used with, or connected to:
a) Internal software that has not been formally accepted BABT.
b) External control software or external control apparatus which causes the operation of the
terminal or associated call set-up equipment to contravene the requirements of the ap-
proval.
All apparatus connected to this terminal and thereby connected directly to the British Telecom
public switched telephone network must be approved apparatus as defined in Section 22 of the
British Telecommunication ACT 1984.
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