In 1945 as the traffic increased it was decided to have a separate network for Telex traffic and the first manual exchange opened in London.
12.
Now consider an old fashioned manual exchange ( you know-nice lady sitting at a big plugboard with a headset on, plugging wires in and out ).
13.
The subscriber set interfaced a telephone set to the telephone network, while magneto generators were used in a manual exchange to generate a remote ring signal.
14.
Customer stations were assigned seven-digit numbers, with the first three digits spelling out the local exchange name; this expedited call handling particularly to and from manual exchanges.
15.
For example, when the last manual exchange in San Francisco was converted to dial in 1953, the numbers had for several years been in the format of JUniper 6-5833.
16.
Holborn was also a tandem exchange for calls to and from local manual exchanges, so that the tandem traffic from manual exchanges was combined with traffic from automatic exchanges.
17.
Holborn was also a tandem exchange for calls to and from local manual exchanges, so that the tandem traffic from manual exchanges was combined with traffic from automatic exchanges.
18.
Rural and regional areas typically relied on manual exchanges, or only one automatic exchange for the whole town, so rural and regional numbers did not feature these letter prefixes.
19.
This service was withdrawn at noon on 28 May 1987 when the last manual exchange in Ireland, at Mountshannon, County Clare, was switched over to an Alcatel E10 digital exchange.
20.
Phone patch should redirect to Telephone exchange ] where there is a nice pic in the top infobox of a telephone operator " patching in " on a manual exchange.
