
PSTN   Public Switched Telephone Network (the global phone network)
AT&T   American Telephone and Telegraph
ESS    Electronic Switching System
DMS    Digital Multiplexing System
CCITT  Committee Consultative International Telegraph and Telephone
POTS   Plain Old Telephone System
DTMF   Dual Tone Multi Frequency
PPM    Phone Punx Magazine
MF     Multi Frequency
CO     Central Office
COCOT  Customer Owned Coin Operated Telephone
BBS    Bulliten Board System
ISDN   Integrated Services Digital Network
ADSL   Asynchronous Digital Subscriber Line
DATU   Direct Access Test Unit
