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Modular expandable telecommunication system

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

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