Title :
ISDN telephone sets with advanced voice functions
Author :
Nishino, Y. ; Naganawa, T. ; Sawada, R. ; Kasai, M. ; Koga, K.
Author_Institution :
NTT Corp., Kanagawa, Japan
fDate :
8/1/1991 12:00:00 AM
Abstract :
Three types of ISDN (integrated services digital network) telephones and LSIs for ISDN telephones have been developed. These telephones feature improved functions using network information and ciphered voice communication using an end-to-end digital link. A low-cost network interface sector that uses LSI with layer 1 to 3 control functions and related software is incorporated. Also, an analog I/O sector was incorporated together with a codec onto a single chip. Low-power-consumption designs for all circuits enable operation with line-fed power for a telephone set, thereby securing communication in times of emergency
Keywords :
ISDN; application specific integrated circuits; cordless telephone systems; large scale integration; telephone sets; ISDN basic feature telephone; ISDN ciphered-voice communication telephone; ISDN cordless telephone; ISDN telephone sets; LSI; analog I/O sector; codec; line-fed power; low-cost network interface sector; low-power-consumption designs; single chip; Circuits; Codecs; Communication system control; Cost function; ISDN; Large scale integration; Stress; Telegraphy; Telephone sets; Telephony;
Journal_Title :
Consumer Electronics, IEEE Transactions on
