Digital telephony
Bellamy,John
Digital telephony - 2nd ed. - New York John Wiley 1990 - xix,572p.
0471620564
ELECTRICAL ENGINEERING
621.395.721 / BEL
Digital telephony - 2nd ed. - New York John Wiley 1990 - xix,572p.
0471620564
ELECTRICAL ENGINEERING
621.395.721 / BEL