Recently, I had an opportunity to read the printed hand-outs of
"Introduction to Line Transmission", Course No E11200, provided by the British Telecom Technical College and dated July 1985.
Being an introduction to the subject, it started at a very elementary level and so I found the course modules as an easy read. That said, there were times when I found myself saying "Ah, so that is why . . ." or "Oh, I never realised . . ."
Here follows a list of the course modules --
- Signals
- System Compatibility
- Diagram Symbols
- dB Notation
- dB Meters
- The Measuring Set 44C
- Transmission Lines
- The Card A140
- The Public Switched Telephone Network
- The Termination Unit
- Audio Equalizers
- Audio Amplifiers
- 4-Wire Amplified Circuits
- Private Circuits
- Setting-Up and Lining-Up a 4-Wire Amplified Circuit
- Faulting a 4-Wire Amplified Audio Circuit
- Transmission Equipment Practice
- Power and Alarms
- Filters and Modulators
- Frequency Division Multiplex
- Digital Transmission
- Non-Speech Services
One thing that interested me was that for the practical work, using the Measuring Set 44C, a simulated 4-wire audio circuit (complete with amplifiers and attenuators) was provided, packaged as a "Suitcase"! The "Suitcase" was fitted with a number of switches which, when operated, provided a diverse range of faults so that practical experience of fault-finding on a 4-wire audio circuit could be gained.
I wonder if anyone has one of those "Suitcases" tucked away in their garage or roof-space? If yes, sight of a clear photograph thereof would be appreciated, please.
