Abstract: A system and method for providing an apparent echo return loss is provided. A communications network may include a gateway coupled to a local exchange network. The gateway may receive signals from a packet network and output signals to a circuit switched network, which may output return signals to the gateway. The local exchange network may provide an echo return loss on signals received from the gateway. The gateway may also provide an initial echo return loss to signals prior to sending the signals to the network. The echo return loss provided by both the gateway and the local exchange network may enable the gateway to determine when to trigger adaptation in order to provide estimates of echo signals generated by the network, and to subsequently eliminate these echo signals from the return signals.

Abstract: A system and method for receiving a transported stream of data packets at a network includes stripping the headers off the data packets at a de-packetizer, buffering the data packets at a jitter buffer and shifting the play-out of the data packets from the jitter buffer to a decoder by at least a fraction of a frame to provide a desired value of channel jitter compensation. The shift in the play-out of the data packets is computed either using a watermark optimization calculation, a frame phase offset adjustment which reduces the delay between packet arrival times and packet depletion times, or a combination of the two.

Abstract: A method and apparatus for distributing protocol processing among a plurality of computing platforms. Data communications equipment such as Remote Access Devices, Communication Servers, Terminal Servers, and Dial-up Routers provide single user or large-scale multiple user communication access to various computing environments. The equipment costs and performance of such access equipment is related to the amount of CPU processing capability and memory required to support the desired number of serial communication links. It is common to use protocols that terminate in their entirely in the same processing machine. This invention encompasses methods developed to increase the cost/performance capabilities of the communication equipment that supports these serial links, primarily by means of distributing the protocol processing for higher level protocols across multiple computing platforms, including devices such as modems. Examples of such higher level protocols include PPP, SLIP and RTP.