Coover, Edwin R.
Tutorial : digital private branch exchanges (PBXs) - Washington IEEE Computer Society Press 1989 - 384p.
0818648293
DIGITAL COMMUNICATION SYSTEMS
TELEPHONE-Private branch exchanges.
TELEPHONE SWITCHING SYSTEMS, ELECTRONIC
DIGITAL ELECTRONICS
621.395 / C6
Tutorial : digital private branch exchanges (PBXs) - Washington IEEE Computer Society Press 1989 - 384p.
0818648293
DIGITAL COMMUNICATION SYSTEMS
TELEPHONE-Private branch exchanges.
TELEPHONE SWITCHING SYSTEMS, ELECTRONIC
DIGITAL ELECTRONICS
621.395 / C6