Hi again,

I have a question about the 634DA Call Director (18 button).

I was enjoying reading the BSP section 502-610-417 (March 1974), and it made referrence to the 236 type KTU that must be used with the 30 button Call Director. There was a vague mention of a "station concentrator", and I am wondering if this 236 KTU was this device. I am completely ignorant of the "station concentrator", but I am guessing (there I go again) that it allows more stations to be accessed via the Call Director than there are physical three pairs copper wires for.

If anyone has any info on this, please let me know. A wonderful soul over on the TCI mail reflector is sending me a green call director, and I am trying to learn as much about this as possible.

Thank you in advance!

Best,

Joe Herdler

Real comms took 200lb teletypes, hand keys, sounders, operators and cranked phones!