Cisco Technology, Inc.

Siemens Business Communication Systems, Inc.

Kirk Dow Sanders

Wing Cheong Chau

Madhu Grandhi

Indrajit Rajeev Gajendran

Ramesh Sastry

Raffaello Pardini

Biju Raghaven Nair

Rangaraju Iyengar

Wing Cheong Chang

A system on a circuit board includes a plurality of devices designed to access an electronic system on the circuit board, and a programmable logic device (PLD) connected to the plurality of devices. Each of the plurality of devices complies with a test port architecture. The PLD interfaces the plurality of devices with a test port. The PLD is capable of configuring different connectivity among the plurality of devices based on the program implemented and the assertion of input control signals. A method and apparatus configures a plurality of devices on a circuit board into a desired configuration using the PLD. The configuration includes (a) receiving a control signal at the PLD, (b) configuring at least one of the plurality of devices into a chain based on the control signal, and (c) coupling the configured chain to the test port via the PLD.

Method and apparatus for configuring plurality of devices on printed circuit board into desired test port configuration

A method for testing a transmission system is disclosed. The method comprises receiving a time division multiplexed (TDM) stream on an input of the transmission system. The method also comprises inserting test data in one or more of the plurality unused fields of the TDM stream. Additionally, the method comprises transferring the TDM stream along a plurality of components of the transmission system and comparing the test data against the transferred test data.

Background test system for time division multiplexing switching systems

An apparatus and method for data processing in a flexible multiple-DSP architecture that can be readily adapted to changing customer demands and changes in DSP processing capability is described. The apparatus comprises of two or more processors, two or more dedicated serial data buses, and a shared data bus. Each processor processes data received via the dedicated data bus in a first type of processing task. Each processor processes data received via the shared data bus in a second type of processing task.

Apparatus and method for processing signals in a plurality of digital signal processors

A method and apparatus is described that provides for switching active data connections from one processor to another processor without significantly interfering with the transmission of the data. The data may be voice calls and the processors may be DSPs residing on a voice processing module. A DSP resource allocation algorithm may be used to load share the data by selectively moving an active voice call currently being processed on one DSP to another DSP having sufficiently available processing power, without interrupting the prevailing service. The liberated DSP may then be used to process a new active voice call. By using the DSPs to load share, the number of simultaneous active voice calls supported by a voice processing module may be increased.

Method and apparatus for hitless switchover of a voice connection in a voice processing module

An integrated circuit is provided for a trunk interface which can test a trunk interface card. Switching circuitry couples tip and ring leads to signal detection circuitry which detects the typical ring and lead signal information. During testing, a test signal is generated which causes the detection circuitry to be coupled to sets of simulated ring and tip test signals which can test the functionality of the integrated circuit and the signal detection circuitry.

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San Jose, CA, United States of America

Kirk Dow Sanders