Apparatus for transfer of voice traffic in VoDSL gateway
AssigneeLG-Nortel Co., Ltd.
InventorsSang-Hyun Kim, Moon-Kyu Choi
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Abstract
An apparatus and method for the transfer of voice traffic in a Voice over Digital Subscriber Line (VoDSL) gateway are disclosed, which are capable of transferring the voice traffic without use of a central processing unit (CPU). The gateway provides an interface between an asynchronous transfer mode (ATM) network and a public switched telephone network (PSTN). The gateway includes a first ATM interface that communicates an ATM cell signal with the ATM network, a vocoder that communicates a voice signal with the PSTN by a channel, and a time division multiplex (TDM) bus that communicates a voice traffic signal between the first ATM interface and the vocoder.
Claims16
An interface between an asynchronous transfer mode (ATM) network and a public switched telephone network (PSTN), comprising:
- an ATM interface that communicates an ATM cell signal from and to the ATM network;
- a vocoder that communicates a voice signal from and to the PSTN by a channel;
- and
- a time division multiplex (TDM) bus that communicates a voice traffic signal between the ATM interface and the vocoder,
- wherein the ATM interface comprises a TDM interface that communicates the voice traffic signal with the vocoder over the TDM bus, synchronously with TDM timing, the TDM interface comprising:
- an aligner that phase-aligns the voice traffic signal from a multiplex/demultiplex unit in synchronization with the TDM timing, phase-aligns the voice traffic signal from the vocoder in synchronization with the TDM timing, and outputs the phase-aligned voice traffic signal from the vocoder to the multiplex/demultiplex unit;
- and
- a parallel/serial converter that converts first parallel voice traffic signals from the aligner into a first serial voice traffic signal, outputs the converted first serial voice traffic signal to the TDM bus, converts a second serial voice traffic signal sent over the TDM bus into second parallel voice traffic signals and outputs the second converted parallel voice traffic signals to the aligner.
A method of communicating data between an asynchronous transfer mode (ATM) network and a public switched telephone network (PSTN), comprising:
- communicating first data from the ATM network to the PSTN, the communicating first data comprising:
- demultiplexing the first data comprising a multiplexed stream of first parallel data units from the ATM network into multiple streams of second parallel data units;
- synchronizing the multiple streams of second parallel data units in synchronization with TDM timing;
- converting each of the multiple synchronized streams of second parallel data units into a stream of first serial data;
- communicating each of the streams of first serial data through a time division multiplex (TDM) bus in an assigned time slot;
- generating a voice signal from each of the streams of first serial data received through the TDM bus;
- and
- transmitting each of the generated voice signals to a destination through the PSTN;
- and
- communicating second data from the PSTN to the ATM network, the communicating second data comprising:
- converting the second data comprising a stream of serial data received from the PSTN over the TDM bus into a stream of third parallel data units;
- phase-aligning the third parallel data units in synchronization with the TDM timing;
- multiplexing the phase-aligned third parallel data units into a multiplexed stream of fourth parallel data units;
- generating ATM packets from the multiplexed stream of fourth parallel data units;
- and
- transmitting the generated ATM packets through the ATM network.
A communication gateway between an asynchronous transfer mode (ATM) network and a public switched telephone network (PSTN), comprising:
- a multiplexer/demultiplexer (demux) that demultiplexes a multiplexed stream of first parallel data units into multiple streams of second parallel data units;
- an aligner that phase aligns the multiple streams of second parallel data units in synchronization with TDM timing;
- a parallel-to-serial converter that converts each of the multiple aligned streams of second parallel data units from the aligner into a stream of first serial data;
- a time division multiplex (TDM) bus that communicates each of the streams of first serial data;
- a serial-to-parallel converter that receives each of the streams of first serial data from the TDM bus in an assigned time slot and converts the streams of first serial data into second parallel data units and outputs the second parallel data units to the aligner;
- multiple vocoders that each generate one of generated voice signals from a separate one of the streams of first serial data received by the serial-to-parallel converter, the aligner phase-aligning the generated voice signals from the vocoders in synchronization with the TDM timing and outputting the phase-aligned voice signals to the multiplexer/demultiplexer;
- a public switched telephone network interface that transmits each of the generated voice signals to a destination at the PSTN;
- and
- an asynchronous transfer mode (ATM) interface that generates ATM packets and transmits the generated ATM packets to the ATM network.
Dependencies are inferred from the claim text.