BT Pentara + Plus System

Originally launched by BT in 1981 as the Herald 100E and later updated to the Pentara + Plus. It's a mid-range PABX / Keyphone hybrid much favoured by medium sized organisations. The Pentara + Plus was a favoured system for sites where single line telephones where the norm together with Keyphones for the main operators.

 

 
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Cable, sockets and installation parts

Wiring Diagram for BT Pentara + Plus Systemphones using Line Jack Unit 2/3C

Line Jack (2/3C)
Colour
Pin
A
WHITE/Blue
5
B
Blue/White
2
C
White/Orange
4
D
Orange/White
3

 

Wiring Diagram for BT Pentara + Plus single line telephone

Line Jack Unit 2/1A
Colour
Pin
A
White/Blue
5
B
Blue/White
2
Earth
White/Orange
4

 

 

Company Registration Number: 4080113 (England)

VAT Number: 471 1806 58

Registered Office: Progress House, 206 White Lane, Sheffield S12 3GL

Director: Dennis Hanna

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