Patent ID: 6275474
Filing Date: 2001-08-14
Classification: H04M,H04Q

Abstract:
Private digital communication apparatus comprising a plurality of interface modules for communicating through a common bus, means for managing access of said interface modules to said common bus, said means for managing access being partially distributed in each of said interface modules, wherein said interface modules each comprises: a line interface (1) connected to said bus, a PCM interface (3), a switching module (2) connected to said line interface (1) and said PCM interface (3), an access control module (5) for driving said line interface (1), a microprocessor (6) for driving said switching module (2), said PCM interface (3) and said access control module (5), wherein said switching module includes buffers for storing bidirectional data transmitted between said bus and a network outside said private digital communication apparatus and a switch for routing signals between said buffers or between said network outside said private digital communication apparatus and said buffers, wherein said switching module includes a switch and an adder for establishing a communication between two of said interface modules or between one of said modules and an external telephone line, and for establishing a conference between one or more external telephone lines and one of said modules or between one or more of said modules and an external telephone line.