Bellamy, John
Digital telephony - 2nd ed. - New York, N.Y. : Wiley-Interscience, 1991 - 572
DIGITAL TELEPHONE SYSTEMS
TK5103.7 / B444D 1991
Digital telephony - 2nd ed. - New York, N.Y. : Wiley-Interscience, 1991 - 572
DIGITAL TELEPHONE SYSTEMS
TK5103.7 / B444D 1991