Palimpsest
Technical User
I have a PEI key telephone model 5933L1 manf. Nov 1987 with 50 line keys and 40 speed dial numbers. I've figured out the basic T/R A/A1 LG/L connections, but not the other power, control, and signaling that must be on additional pairs, likely on the first of the five 25-pr Amphenol cables. I also have no idea whether any external logic was needed beyond 400 KTU cards. I've found no literature specifically for this phone or its series, and only one incomplete document for a later 1993 "ElectroKey" descendant. PEI couldn't help. I'd appreciate any literature or references, recollections, or (at this point) informed guesses. Thanks.
