Telephone Switchboard! My 5+20 PMBX
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- Опубліковано 15 бер 2022
- This is my battered old GPO 5+20 PMBX manual switchboard. This example was issued by Post Office Telephones in the UK in the mid 1960s, right in the middle of the Strowger era!
It's entirely manual, and requires an operator to put calls through. It's called a 5+20 because it can support up to 5 incoming exchange lines, and 20 telephones.
Here I just show you the basics of how to put through an incoming external call. You can also make internal only calls, internal to external calls, night service, hold, cord testing and other facilities. - Наука та технологія
I had the same telephone system for years ,I loved it !
I find this fascinating. I love your phone videos.
Nice simple technology
So how did the operator know the conversation was done? Was she listening the whole time?
When the call finishes, and the people on the call hang up, the indicators associated with the call re-operate and the buzzer sounds (like it did at the beginning of the call)
Because the cords are still plugged it, the operator knows it’s a finished call (not a new one) and can unplug the cords.
When the extension station hung up at the end of the call, the dolls eye indicator would raise, alerting the operator.
So. I'm familiar with common battery switchboards that have a light for each extension and a pair of lights for each cord pair. When the call is over the lamps come back on to indicate to the operator that it's time to pull the cords down.....how can you tell when a call is complete on a magneto board (other than eavesdropping)?
This is a common battery board, not a magneto board. The phones are ordinary phones, and don't need their own local magneto generators.
The equivalent of your supervisory lamps on this board are the dolls-eye indicators. They re-operate when the call clears to indicate to the operator that the cords can be restored.
On a true magneto board, the callers would "ring off" when they finish their call, by winding the magneto handle on their phone. That would alert the operator that the call was finished.
Hope that makes sense!
@@lpbkdotnet Makes perfect sense. I didn't notice the indicators at first....or rather, I didn't notice that they were not flap type indicators as on a magneto board.
Thanks!
How much did it cost for you to get this?
everything