| As Telephone No. 756 but with provision for four press buttons. TELECOMMUNICATIONS INSTRUCTION
B MARKETING COMMERCIAL
4 Facilities and Apparatus
B0144
Issue 1, Nov 1979 PUSH BUTTON TELEPHONES SELF CONTAINED (SC) BATTERYLESS
Four Button Table Model (Telephone 758)
DESCRIPTION
This batteryless Push Button Telephone is a four button table instrument which has a 10 button
keypad; it supersedes the battery operated Telephone 768. The instrument is available only in ivory. Each key has a black engraved numeral on a white ground. The layout of the numbers conforms to the recommendations of the International Consultative Committee on Telephones and Telegraphs (CCITT).
A number label is located below the keypad.
The instrument will be issued with a 3 metre cord but a longer cord can be fitted if required.
FIELD OF USE
This instrument is suitable for those Plan extension arrangements which could be provided by the use of the
4 button dial telephone (740) on either exclusive or shared service lines or as PBX extensions (with or without recall facilities). It can also be used as the operators instrument on PBXs
- except when a Dial 25 is required.
NOTE: Some of the newer types of PABX are designed to have special 12 button PABX Push Button Telephones as described in B14
B0101.
If a Push Button Telephone is provided in association with subscribers automatic group transfer service, a separate dialling unit must be supplied (normally a Plan
1A for which a charge is raised).
For policy and/or technical reasons it cannot be provided:-
- to work on Plan arrangements with obsolescent (ie pre 700 type)
telephones
- as the carrier subscriber on the WB900 '1 + 1' subscribers carrier
system
Push button telephones can be provided with the following subsidiary equipment:-
- Amplifying Handsets (Handset 14A)
- Answering Sets 1 & 2
- Bells, Buzzers and Hooters
- Callmakers
- Clock type Meters
- Faint Speech Amplifiers
- Key & Lamp Units
- Lamp Signalling Handsets (Handset 7)
- Renters POA Coinbox (CC 700 only)
- Speakers sets 1 & 2
- Subscribers Controlled Transfer Equipment
- Transmitter Cut-out (Handset 6)
- Trimphones
- Watch Receivers
NOTE: In cases where a Push Button Telephone is provided for use in association with a Speakerset 2 with handset control, the Speakerset cannot be switched in until the call has been connected.
ADDITIONAL TECHNICAL DETAILS - FOR INFORMATION ONLY
The Push Button Telephone contains miniaturised electronic components (integrated circuits) which store the digits as they are keyed and then transmit them to the public exchange in the form of normal dial pulses.
Additional information
| Model | Mark | Ivory | Grey | PBU No. | Introduced | Remarks | | Tele 758 | Mk 1 | y | y | 53A/1 | 7/82 | STC AS TELE 1/758 | | | Mk 2 | y | y | 53B/1 | 7/82 | STC cost reduced known as Tele 1/758 Mk 2 | | | Mk 3 | y | y | 53A/2 | 7/82 | GEC as Tele 2/758 | | | Mk 4 | y | y | 53A/3 | 7/82 | PYE-TMC | | | Mk 5 | y | y | 53C/1 | 7/82 | STC | | | Mk 6 | y | y | 53B/2 | 7/82 | GEC | | | Mk 7 | y | y | 53B/3 | 7/82 | PYE/TMC | | | Mk 8 | y | y | 53B/4 | 7/82 | Plessey | | | Mk 9 | y | y | 53A/5 | 3/82 | BTF repair | | Tele 1/758 | Mk 1 | y | y | 53A/1 | 8/76 | STC | | Tele 1/758 | Mk 2 | y | y | 53B/1 | 11/76 | STC cost reduced | | Tele 2/758 | | y | y | 53A/2 | 4/79 | GEC cancelled in 1/80
(GEC TEL89P) |
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