This document is a pot pourri of information. It does not replace official documentation for a product or service but intends to give an overview. Some of the information is raw, whilst some is complete. If you find something inaccurate or wish to have an input into the document then contact the author.

The author of this document is R. Freshwater
The information contained within this document is for educational use and in all cases is the property of the contributors/owners and can only be copied for personal/private use. Permission must be obtained, from the owner if you intend to use any of the information for profit.

1998 - 2022 R. Freshwater.

The author or contributors accept no liability for errors or omissions within this document, but will update latter versions with any corrections or additional information that is sent to the address below.

The author can be contacted on telephone number 01594 562014 (International +44 1594 562014)
or preferably by snail mail to:-
Bemerton, Crown Lane, Yorkley, Glos, UK. GL15 4TP

Or E-mail me on:-

Contributors and acknowledgements

British Telecom, Rob Grant, David Clyde, GPO, Dave Bell, Mike Winter, Paul Ebling, Tony Rogers, Post Office Telecommunications, Telecoms Heritage group, Jack Edwards.

All manufacturers names and trade marks are acknowledged.

Submissions may be inserted at the discretion of the author and are only accepted on condition that the owner or submitter will make no claim on the author for their use. This document has been compiled on a non profit making basis.

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Last revised: April 06, 2022