Paul Webster wrote: > IATA messages ... although most of our systems were in places that used > similar format but were not airlines. They were modified telex system which were circuit switched devices - so when ,message were sent there was a "copper loop" between device,IIRC signalling was done via current not volts and so guaranteed messages. The company I worked, one of their products was a compatible terminal- final testing at airline meant checking failure tolerance - throw as much volts and current until the device literally was burnt out.
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