2019-04-06 HP Transmission Test Set

from FB group Bell Telephone of… Apr 6

(I bought a transmission test set, TTS-4, photo at bottom.)

Glenn Peters
We had a HP 493something transmission test set for testing up to 56 kb/s lines. I remember seeing the symbols on the green screen, like a carriage return would look like a little ‘CR’. The reason why we had it was because our mainframe computer was polling multiple terminals on the same line, and there was finger pointing by the software guys that our terminals were not behaving properly. We had to record the data between the front end of the mainframe and the terminals to prove whose fault it was. I think the front end was the problem, not the terminals. But this HP set was all digital, not analog. It used a little tape cassette.

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