Digital telephony
Bellamy, John C.
Digital telephony - 3rd ed - New York John Wiley, 2000 - xxv,643 p. 24 cm - .
0-471-34571-716
Digital telephone systems
621.395 Bel(4)
Digital telephony - 3rd ed - New York John Wiley, 2000 - xxv,643 p. 24 cm - .
0-471-34571-716
Digital telephone systems
621.395 Bel(4)