Digital telephony
Bellamy, John
Digital telephony - 2nd ed - New York : John Wiley, 1991 1991 - xix,572 p. 23 cm - .
0-471-62056-441
Digital telephone systems
621.395 Bel(3)
Digital telephony - 2nd ed - New York : John Wiley, 1991 1991 - xix,572 p. 23 cm - .
0-471-62056-441
Digital telephone systems
621.395 Bel(3)