Network Equipment Technologies, Inc.

Tony Hardie

Terry Marc Hardie

John Grass

Jeffrey Sean Connell

Jesper Kristensson

The present invention relates to methods, apparatuses, and systems for relaying data involving obtaining a data stream from a data source, forwarding the obtained data stream over a network, while forwarding the obtained data stream over the network, monitoring the obtained data stream to detect a data transfer mode associated with inclusion of synchronization characters in the obtained data stream, and if the data transfer mode is detected, removing a plurality of synchronization characters from the obtained data stream to produce a bandwidth-reduced data stream and forwarding the bandwidth-reduced data stream instead of the obtained data stream over the network. Synchronization characters may comprise start bits, stop bits, and idle bits. The data transfer mode may be an asynchronous data transfer mode based on a V.14 standard. Also, the asynchronous data transfer mode may be detected by decoding a predetermined number of valid V.14 frames from the obtained data stream.

Automatic detection and processing of asynchronous data for bandwidth reduction

A method for establishing a synchronous connection between two terminals over an asynchronous communication transport is provided. The method includes receiving, from a first secure terminal, an indication for establishing a connection with a second secure terminal. The indication is received at a first gateway, which then sends the indication to a second gateway. The first gateway negotiates with the first secure terminal to establish a connection with the first gateway. The negotiation is performed without the first gateway communicating with the second gateway or the second secure terminal. A second gateway also negotiates with the second secure terminal to establish a connection with the second gateway. When it is determined that the first secure terminal and first gateway have established a first connection and the second secure terminal and second gateway have established a second connection, a connection between the first secure terminal and the second secure terminal is established through the first gateway and the second gateway.

Non-relay initialization for modems

Techniques for compensating for synchronous data stream transported over an asynchronous system are provided. The techniques include compensating for network jitter for an asynchronous connection over an asynchronous transport, using frame slip control for compensating for a synchronous connection over an asynchronous transport, and dropping filler frames for compensating for a synchronous connection over an asynchronous transport.

Techniques for asynchronous compensation for secure communications

Methods, apparatuses, and systems are presented for compensating for independent clocks in relayed modem communications involving receiving data packets from a first network device, forwarded over a packet-based network, at a second network device, the data packets representing data in a first modulated signal from a first modem, the first modulated signal being associated with a first symbol rate, placing data derived from the data packets into a queue in the second network device, generating a second modulated signal at the second network device for transmission to a second modem, the second modulated signal being generated using data retrieved from the queue and being associated with a second symbol rate, obtaining at least one queue size measurement associated with data in the queue, and effectively adjusting the second symbol rate based on at least one queue size measurement associated with data placed in the queue in the second network device.

Compensation for independent clocks in relayed communication over packet-based networks

A system capable of supporting secure communication over a packet-based network is provided. The system includes a transmit terminal adapted to transmit information. A secure terminal relay is coupled to the transmit terminal and configured to receive the information. The information is then converted into baseband information. A communication gateway coupled to the secure terminal relay is configured to receive the baseband information from the secure terminal relay. The baseband information is then packetized for transmission over the packet-based network.

System and method for secure communication over packet network

A method is provided for forward error correction for packets of information transmitted in a network. In one example, the method includes adding redundant information to the packets to be transmitted; transmitting the packets, wherein many of the packets become arrived packets, and wherein one or more of the packets becomes one or more lost packets; and restoring the one or more lost packets using redundant information of the arrived packets.

Forward Error Correction (FEC) for packetized data networks

A system and method for using forward error correction (FEC) to improve transmission reliability for data packets transmitted over packetized data networks, such as voice packets transmitted over an Internet Protocol (IP) network is disclosed. Packets containing error data are transmitted separately from corresponding voice packets. The error packets are transmitted a predetermined number of frames before the voice packets, to increase the probability that either the voice packet or error packet will be received. The error packets are preferably created using a Reed-Solomon algorithmn. The amount of error correction transmitted may be adaptively adjusted based on the reliability of the network connection.

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Fremont, CA, United States of America

Tony Hardie