Original file (2,972 × 2,000 pixels, file size: 2.23 MB, MIME type: image/jpeg)
 | This is a file from the Wikimedia Commons. Information from its description page there is shown below. Commons is a freely licensed media file repository. You can help. |
Summary
| Description |
The Panel District Sender Selector Frame was used during call setup to connect an idle Sender to the District selector requesting. At call start the rotary switch would step around until an idle Sender was found. When this connection was established the caller would hear dialtone. As the caller dialed a number the sender would call in a Decoder to obtain routing information and start setting up the connection while the caller was still dialing. At the completion of call setup the Sender would 'advance' the District selector into 'talk' position. At this point the Sender is out of the call and the caller could hear the distant end. A CGO District Sender Selector could handle 22 Senders. Where as a BCO Sender Link Frame Selector could handle 100 Senders. During very high traffic it was possible for all senders in a given group to be busy. This caused the DSS switch to keep stepping round and round. If this continued too long other DSS switches did the same thing sometimes causing the cat to chase its tail and eventually over heating the DSS switch usually resulting in a DSS switch stopping on a busy Sender. This caused more problems. Stuck Senders. Less Senders available and so on... Not a pretty sight. |
| Date | 9 January 2009 (original upload date) |
| Source | No machine-readable source provided. Own work assumed (based on copyright claims). |
| Author | No machine-readable author provided. Panel Switchman assumed (based on copyright claims). |
Licensing
|
I, the copyright holder of this work, release this work into the public domain. This applies worldwide. In some countries this may not be legally possible; if so: I grant anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law. |
File history
Click on a date/time to view the file as it appeared at that time.
| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 22:05, 9 January 2009 | | 2,972 × 2,000 (2.23 MB) | Panel Switchman | The Panel District Sender Selector Frame was used during call setup to connect an idle Sender to the District selector requesting. At call start the rotary switch would step around until an idle Sender was found. When this connection was established the c |
File usage
Global file usage
The following other wikis use this file:
- Usage on es.wikipedia.org
