Hello.
Cellular One, McCaw Communications, upgraded and moved the Mobile Telephone Switching Office when they split from SATELCO, the San Antonio Telephone Company.
Anyhow, they left behind an entire number 5 Electronic Switching System!
The other location, on Broadway, has upgraded and now supports Grande Communications VoIP by Cable.
http://grandecom.com/index.php?kw=gr...FQtdswod9xcc2A
Just think, a bunch of hackers who now have unlimited access to a central office switch!
Originally built by AT&T and Paradyne/Pan American cellular group, depending on what cabinet you look at.
this is clearly a TelCo switch with MTSO duties added.
There are a lot of notes that explain the transition from AMPS to TDMA but was not upgraded past that.