Image: ISDN box on wall June 21
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Description: ISDN box on the wall in a hospital. BT’s ISDN 2e. The light in the centre should be green if it has any kind of connection to the exchange. This is long disconnected.
Title: ISDN box on wall June 21
Credit: Own work
Author: Secretlondon
Usage Terms: Creative Commons Attribution-Share Alike 4.0
License: CC BY-SA 4.0
License Link: https://creativecommons.org/licenses/by-sa/4.0
Attribution Required?: Yes
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