I think one of the first scans I ever did was of the Abilene switch.
Don't forget DLLSTXWHCG0. 214-946-9990 is a not in service recording from that switch. Could the guy making that be any more of a good 'ol boy?
That one sounds like a DMS-100 to me.
What does the CG0 as opposed to DS0 (Digital Signal 0) stand for? 0 is for 64k lines, at least DS0, That much I think I know, what about CG?
DS0 in the context of a CLLI code is actually a little different. A CLLI is read as WWWWXXYYZZZ:
W and X are the equipment's city and state as you've already noticed.
Y = Building code
Z = Equipment code. For a switch, the first two characters tell you what kind it is, while the last tells you which it is, usually starting with 0 and going up.
VS = Video switch (or so I've heard)
GT = Trunk gateway (usually for packet-based media gateways)
CM = Commercial Mobile switch
PS = Packet Switch
DS = Digital Switch
CG = Control Group (Digitally controlled electromechanical switch)
MG = Marker Group (Crossbar)
DG = Decoder Group (Panel)
SG = Selector Group (Step)