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1st Selectors: SLCs were connected directly to these First Selectors.
Photo © John
Lamble 1977.
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2nd Selectors: The first two racks are Second Selectors the
rest are Final Selectors.
Photo © John
Lamble 1977.
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Other VF test facilities - including separate send and
receive Telegraph Distortion Measuring Sets, TDMS.
Photo © John
Lamble 1977.
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Amplitude Modulated telegraph Voice Frequency equipment
racks - Type 4. Each VF system contained 24 channels
operating in the commercial speech range.
Photo © John
Lamble 1977.
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Frequency Shift VF rack - 24 channels per system.
Photo © John
Lamble 1977.
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This shows the combined fault reporting point for both JTS
and L/TCN VFT, originally they were separate. In the
background are the TASS ECBs (Engineering Control Boards)
used to access individual circuits, the map high up on the
right is of the Shell-Mex BP network.
Photo © John
Lamble 1977.
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This was the IDF (Intermediate Distribution Frame) for JTS
situated behind the ECBs.
Photo © John
Lamble 1977.
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MOTNE Phase 3: Control equipment for the collection and
distribution of weather data from UK airports and Europe
operating at 75 baud for the CAA.
An improved version -MOTNE Phase 4 - was installed at St.
Botolphs - I think in the mid 70s.
Photo © John
Lamble 1977.
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