Lot 4 Pulsecom 4TOLB-3L1 4-wire transmission only channel units
Lot of four Hubbell / Pulsecom transmission only channel units, model 4TOLB-3L1 These modules are marked "D105177-1" and also have bar code stickers marked "D4C0P885AA". Three of these boards have boxes and the original instructions. According to the instructions, these are "4-wire, 600 ohm transmission only channel units with loopback". The instructions are dated 1992.
There are four of these modules in this lot, byut one of them missed being photographed.
These are from the estate of an industrial telecommunications engineer and ham radio enthusiast. We don't know much about them. We have not tested them and the boxes are worn and dirty from storage.