Modular expandable telecommunication system

• US 20020044571A1
• Filed: 10/03/2001
• Published: 04/18/2002
• Est. Priority Date: 10/13/2000
• Status: Active Grant

• Current Assignee: NVIDIA International Inc. (NVIDIA Corporation)
• Original Assignee: Alcatel SA (Nokia Corporation)
• Inventors: Penet, Xavier
• Granted Patent: US 7,843,971 B2
• Time in Patent Office: Days
• US Class Current: 370/506
• CPC Class Codes: H04M 7/006 Networks other than PSTN/ISDN providing telephone service, e.g. Voice over Internet Protocol (VoIP) , including next generation networks with a packet-switched transport layer H04L65/00 takes precedence; aspects not specific to the type of network H04M3/00; special services in those networks H04M3/42
• CPC Class Codes: H04Q 1/025 Cabinets
• CPC Class Codes: H04Q 1/10 Exchange station construction
• CPC Class Codes: H04Q 11/04 for time-division multiplexing H04Q11/0001 takes precedence
• CPC Class Codes: H04Q 2201/04 Modular construction
• CPC Class Codes: H04Q 2201/806 in PBX or KTS systems
• CPC Class Codes: H04Q 2213/13003 Constructional details of switching devices
• CPC Class Codes: H04Q 2213/13103 Memory
• CPC Class Codes: H04Q 2213/13106 Microprocessor, CPU
• CPC Class Codes: H04Q 2213/13107 Control equipment for a part of the connection, distributed control, co-processing
• CPC Class Codes: H04Q 2213/13178 Control signals
• CPC Class Codes: H04Q 2213/13214 Clock signals
• CPC Class Codes: H04Q 2213/1322 PBX
• CPC Class Codes: H04Q 2213/13292 Time division multiplexing, TDM
• CPC Class Codes: H04Q 2213/13299 Bus
• CPC Class Codes: H04Q 2213/13305 Transistors, semiconductors in general
• CPC Class Codes: H04Q 2213/1332 Logic circuits
• CPC Class Codes: H04Q 2213/13322 Integrated circuits
• CPC Class Codes: H04Q 2213/1336 Synchronisation
• CPC Class Codes: H04Q 2213/13396 Signaling in general, in-band signalling
• CPC Class Codes: H04Q 3/625 : Arrangements in the private branch exchange

Abstract

The present invention concerns a modular expandable telecommunication system, such as a private automatic branch exchange system (PABX), comprising a main cabinet and at least one expansion cabinet, which are interconnected with each other in order to obtain an extended telecommunication system with increased connection possibilities for extensions and trunks. System characterized in that the main cabinet and each of the expansion cabinet comprise a transmission interface unit allowing connection of the said expansion cabinet(s) with said main cabinet via a single transmission link conveying voice/data channels and low level or local signaling for performing at least mutual synchronization and clock recovery for all interconnected cabinets, the main cabinet comprising in particular a master clock device, a CPU for running the application and a DSP for routing the higher level messages issued by the CPU depending on the physical location of the destination cabinet.

Claims

1. Modular expandable telecommunication system, such as a private automatic branch exchange system (PABX), comprising a main or primary cabinet and at least one expansion or secondary cabinet, remote located or not, which are interconnected with each other in order to obtain an extended telecommunication system with increased connection possibilities for extensions and trunks, wherein the main cabinet and each of the expansion cabinet comprise a transmission interface unit (3′

) allowing connection of the said expansion cabinet(s) with said main cabinet via a single transmission link conveying voice/data channels and low level or local signaling for performing at least mutual synchronisation and clock recovery for all interconnected cabinets, the main cabinet comprising in particular a master clock device, a CPU for running the application and a DSP for routing the higher level messages issued by the CPU depending on the physical location of the destination cabinet.

2. Modular expandable telecommunication system according to claim 1, wherein each transmission interface unit consists of an ASIC associated with a corresponding DSP, the DSP of the main cabinet controlling the switching of all external connections of all cabinets.

3. Modular expandable telecommunication system according to claim 2, wherein that each interface unit is adapted for connection through a transmission link consisting of a high speed link implemented on 2 pairs and using PCM multiplex for voice/data transmission.

4. Modular expandable telecommunication system according to anyone of claims 1 to 3, wherein each transmission interface unit comprises means providing synchronisation with clock recovery and frame adjustment, control channel of the corresponding expansion cabinet, remote resetting and software downloading of the said expansion cabinet, support for external interfacing and connecting means for short or long haul transmission and line coding and/or scrambling.

5. Modular expandable telecommunication system according to claim 4, wherein in each expansion cabinet, the control channel performs all initialisation and maintenance functions for said cabinet and in that the synchronisation and the clock recovery are performed automatically, as soon as the corresponding expansion cabinet is connected with the main cabinet.

6. Modular expandable telecommunication system according to anyone of claims 4 and 5, wherein the cabinets are of different sizes depending on their number of connection sites.