Digital telephony
Bellamy, John
Digital telephony - 2nd ed. - New York: John Wiley & Sons, Inc., 1991 - xix, 572p.
Telephony
Communication
621.395 / N1
Digital telephony - 2nd ed. - New York: John Wiley & Sons, Inc., 1991 - xix, 572p.
Telephony
Communication
621.395 / N1