Siemens Information & Communication Networks, Inc.

Abid Farooq

Marcel Manzardo

Steven R Cole

Marcel Manzado

A telecommunications system ( ) is provided that includes a first controller ( ) and a second controller ( ) coupled using a packet-switched network ( ). The controllers provide a low cost means of coupling isochronous telecommunication devices. The first controller ( ) receives one or more isochronous input channels from a common control shelf ( ), such as a private branch exchange (PBX), over a circuit-switched network ( ). The first controller ( ) encapsulates an isochronous frames from the common control shelf ( ) into a data frame that is transferrable over the packet-switched network ( ). The second controller ( ) is configured to receive the data frame and extract the isochronous frame, which is then transmitted to a peripheral shelf ( ), such as a line trunk unit (LTU), using an isochronous circuit-switched network ( ). The controllers contain identical functionality, permitting bi-directional transmission of data between the common control and peripheral shelves. Each controller includes multiplex/de-multiplex functions normally associated with isochronous telephony, as well as a packetize/de-packetize functions for transferring data over the packet-switched network ( ). The arrival rate of the data packets is used for synchronizing the two controllers.

Apparatus and method for interconnecting isochronous systems over packet-switched networks

A telecommunications system ( ) includes a fail-safe subsystem ( ) capable of maintaining call services to remote users in the event of a communication failure. The fail-safe subsystem ( ) is coupled to a communication link ( ) between a main switch ( ) and a remote shelf ( ). The subsystem ( ) passively monitors the status of the communication link ( ). Upon detecting a failure, the subsystem ( ) provides a limited set of call services to remote users by providing local switching services. Upon re-establishing communications with the main switch ( ), the fail-safe subsystem ( ) re-synchronizes the main switch ( ) and remote shelf ( ) by emulating a conventional call setup procedure for each call placed through the remote shelf ( ) during the failure.

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Danville, CA, United States of America

Abid Farooq