Private branch exchange, telecommunication system and methods of

Details Private branch exchange, telecommunication system and methods of Private branch exchange, telecommunication system and methods of

1997-09-26

2000-03-28

Kizou, Hassan

Multiplex communications

Channel assignment techniques

Adaptive selection of channel assignment technique

370468, 370458, 370538, H04J 316, H04J 322, H04L 1243

Patent

active

060440821

ABSTRACT:
The present invention relates to a private branch exchange, a telecommunication system comprising such an exchange and methods of transmitting signals in subrate channels of a fullrate channel. The exchange comprises a switch control means, which allocates subrate traffic channels of the fullrate channel to voice and data, and a channel handling device (44), which comprises at least one voice channel means (66, 68, 70) connected to a respective channel input (22, 24, 26) and being arranged to compress signals appearing on this input (22, 24) or to pass at least part of each signal through unaffected. The compressed or passed signals are fed to a multiplexer (76), which multiplexes signals incoming from the voice channel means to outgoing signals for sending in a fullrate channel on a first telecommunication line (14). A demultiplexer (78) is also included for demultiplexing signals in a fullrate channel.

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ITU-T Recommendation 1.460, Integrated Services Digital Network (ISDN), ISDN User-Network Interfaces, "Multiplexing, Rate Adaption and Support of Existing Interfaces", 1993, pp. 1-3.
ITU-T Recommendation V.110, Series V: Data Communication Over the Telephone Network, Interworking With Other Networks, "Support by an ISDN of Data Terminal Equipments with V-Series Type Interfaces", 1996, pp. 1-55.
CCITT Recommendation G.728, General Aspects of Digital Transmission Systems; Terminal Equipments, "Coding of Speech at 16 kbit/s Using Low-Delay Code Excited Linear Prediction", 1992, pp. 1-25.

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