Key Service Units
This page is for information only. We don't have any KSUs for sale.
- doing business
with us - ask a question
- what is 1A2?
- why call it a "key" system?
- ancient telecom terminology
- 1A2 on TV
- presidential phones
- phone bottom markings
- 1A2 technology
- What killed 1A2?
- 1A2 advantages
- old ads
- phones
- accessories
- parts
- Key Service Units
- assorted stuff
- tools & testers
- installation supplies
- trading post
(buy & sell) - Com Key
(sort of 1A2) - "mechanical hold"
(not quite 1A2) - ITT Terryphone
fancy 1A2 - info center
- 1A2 hacks
and tricks - 1A2 system maintenance
- weird phones
- the 1A2 manufacturers
- what happened
to AT&T? - phone system evolution
- What about 1A3?
- books
- our websites
- our customers
- same model number, different phone
