Digital telephony
Bellamy, John
Digital telephony - 2ed - New York John Wiley 1982 - xix, 572p
04471620564
Elctronic
Digital Communications
Telephone Switching Systems
621.385 / B43D
Digital telephony - 2ed - New York John Wiley 1982 - xix, 572p
04471620564
Elctronic
Digital Communications
Telephone Switching Systems
621.385 / B43D