I'm not sure if this is the right place to ask.
I am trying to build a base station for a TACS (Total Access Communication System) phone, but I have not found any detailed document about it. The most I have found is a channel table and frequencies, but I would need all the details about channel negotiation, signalling and protocols.
It seems that any info about this old technology has been buried. I hope there is someone here that knows something more about it.
Update: 3GPP has told me they have no documentation since it was a pre-ETSI standard.