Infotron made intellegent multiplexers, this might
be a test set for that.
They also made erzatz DH-11's a LONG time ago.
I forgot to mention on the back of the Infotron there are five DB25
connectors labeled as follows: TO MODEM, MALE; TO TERM, FEMALE AND THREE
FEMALES LABELED: T NETWORK.
Bill
whdawson(a)mlynk.com