Modem relay over packet based network
AssigneeSurf Communication Solutions Ltd.
InventorsOren Somekh, Abraham Fisher, Yona Sivan
Life of this patent
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Abstract
A method of transmitting signals between a source modem and a destination modem. The method includes transmitting the signals from the source modem, over a first switched network path, to a first interface, encapsulating the at least some of the signals received by the first interface into packets, transmitting the packets from the first interface over a packet-based network to a second interface, removing the encapsulation of the signals at the second interface; and transmitting the data signals from the second interface over a second switched network path to the destination modem.
Claims25
A method of transmitting, non-facsimile, data signals between a source modem and a destination modem, comprising:
- receiving data signals transmitted from the source modem, over a first switched network path, by a first gateway;
- demodulating the data signals at the first gateway;
- transmitting at least some of the demodulated data signals from the first gateway to a second gateway, remote from the first gateway, over an intermediate path;
- modulating the data signals at the second gateway;
- and
- transmitting the modulated data signals from the second gateway over a second switched network path to the destination modem,
- wherein transmitting at least some of the demodulated data signals comprises determining, by the first gateway, whether the data signals received from the first modem have an information content and not transmitting at least some of the signals determined not to have an information content.
A method according to any of the preceding claims, wherein transmitting at least some of the demodulated data signals from the first gateway to the second gateway comprises transmitting encrypted signals.
A gateway for transferring, full duplex, voice band modem signals between a switched network and a packet based network, comprising:
- a switched network interface adapted to concurrently transmit and receive modulated modem signals on a switched network path;
- a modem adapted to modulate signals transmitted by the switched network interface and demodulate signals received by the switched network interface;
- a packet interface adapted to transmit and receive signals on a packet based network connection;
- and
- a controller adapted to establish a logical connection between a switched network path and a packet based network connection, before data signals are transmitted on the switched network path, and to forward at least some of the data signals passing on the logical connection between the packet interface and the modem,
- wherein the controller is configured to determine whether the data signals received through the switched network interface have an information content and is configured not to forward at least some of the signals determined not to have an information content.
A system for transmission of, full duplex non-facsimile, modem signals over a packet based network, comprising:
- first and second gateways adapted to receive data signals from first and second modems, to demodulate the received data signals and to transmit the demodulated data signals over an intermediate network, to receive the data signals transmitted over the intermediate network, to modulate the signals and to transmit the data signals to the second and first modems, respectively,
- wherein the rates at which the first gateway transmits and receives data signals from the first modem and the rates at which the second gateway transmits and receives data signals from the second modem are different,
- wherein the gateways are configured to determine whether the data signals received from the modems have an information content and are configured not to forward to the other gateway at least some of the signals determined not to have an information content.
Dependencies are inferred from the claim text.