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This a press button unit that consists of a 10 button keypad marked 1 to 0.
The keypad is LD (Loop Disconnect) only.
Used on Telephone No. 766 and LST No. 8A (52C/1).
| Model |
Mark |
Blue |
Grey |
Green |
PBU |
Introduced |
Remarks |
| Telephone 766 |
Mk 1 |
y | y |
y | 52A/1 |
8/76 | STC - was 1/766 |
| |
Mk 2 |
y | y |
y | 52B/1 |
1/80 | STC - was 1/766 (cost reduced) |
| | Mk 3 |
y | y |
y | 52A/2 |
10/78 | GEC - was 2/766 |
| | Mk 4 |
y | y |
y | 52A/3 |
1/79 | PYE - was 3/766 |
| | Mk 5 |
y | y |
y | 52C/1 |
8/79 | STC - was 4/766 |
| | Mk 6 |
y | y |
y | 52B/2 |
7/80 | GEC | | |
Mk 7 |
y | y |
y | 52B/3 |
7/80 | PYE/TMC |
| |
Mk 8 |
y | y |
y | 52A/4 |
11/81 | PLESSEY |
| |
Mk 9 |
y | y |
y | 52A/5 |
1/82 | BTF |
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