EP 1111880 A9 20011212 - Method and apparatus for detecting dual tone alerting signal in telephone systems
Title (en)
Method and apparatus for detecting dual tone alerting signal in telephone systems
Title (de)
Verfahren und Vorrichtung zur detektierung von zweiton-Anrufsignalen (DT-AS) in Fernsprechsystemen
Title (fr)
Procédé et dispositif pour la détection de signaux d'appel à deux tonalités (DT-AS) dans des systèmes téléphoniques
Publication
Application
Priority
GB 9929277 A 19991211
Abstract (en)
[origin: EP1111880A2] The invention relates to packet switched networks, and more particularly to a circuit and a method for clock recovery in cell-relay networks, particularly ATM (Asynchronous Transfer Mode) networks offering constant bit rate services. The multimode clock recovery circuit has an embedded digital phase locked loop including an input circuit capable of generating a phase signal from at least two types of input signal. The phase signal controlling the output of the phase locked loop generates clock signals for the constant bit rate services.
IPC 1-7
IPC 8 full level
H03L 7/085 (2006.01); H03L 7/099 (2006.01); H03L 7/14 (2006.01); H03L 7/18 (2006.01); H04J 3/06 (2006.01); H04L 27/26 (2006.01); H04M 1/00 (2006.01); H04M 1/02 (2006.01); H03L 7/095 (2006.01); H04L 12/56 (2006.01); H04L 12/70 (2013.01)
CPC (source: EP US)
H03L 7/085 (2013.01 - EP US); H03L 7/0994 (2013.01 - EP US); H03L 7/146 (2013.01 - EP US); H03L 7/18 (2013.01 - EP US); H04J 3/0632 (2013.01 - EP US); H03L 7/095 (2013.01 - EP US); H04J 3/0688 (2013.01 - EP US); H04J 3/0697 (2013.01 - EP US); H04L 2012/5616 (2013.01 - EP US); H04L 2012/5652 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR
DOCDB simple family (publication)
EP 1111880 A2 20010627; EP 1111880 A3 20040421; EP 1111880 A9 20011212; EP 1111880 B1 20060322; CA 2327907 A1 20010611; CN 1171432 C 20041013; CN 1300154 A 20010620; GB 2357216 A 20010613; GB 2357216 B 20040512; GB 9929277 D0 20000202; JP 2002016667 A 20020118; JP 3779874 B2 20060531; US 2001033648 A1 20011025; US 6813350 B2 20041102
DOCDB simple family (application)
EP 00311023 A 20001211; CA 2327907 A 20001208; CN 00137366 A 20001211; GB 9929277 A 19991211; JP 2000376279 A 20001211; US 72917300 A 20001205