Abstract: A switched telecommunications network includes different types of traffic, such as audio data, including voice data, fax and modem originated data, digital computer originated data and video data. A communications link connects a user's site to the network, and a bandwidth manager is provided to multiplex traffic of different types for transmission over the link. After transmission over the link, a complementary bandwidth manager is arranged to de-multiplex the traffic for application to the respective switch. The bandwidth manager is arranged to dynamically allocate bandwidth to the different types of traffic, thereby optimizing the available bandwidth provided by the communications link.

Abstract: A switched telecommunications network includes a plurality of switches for switching different types of traffic, such as audio data, including voice data, fax and modem originated data, digital computer originated data and video data. A communications link connects a user's site to the network, and bandwidth manager are provided to multiplex traffic of different types for transmission over the link. After transmission over the link, a complementary bandwidth manager is arranged to de-multiplex the traffic for application to the respective switches. The bandwidth manager is arranged to dynamically allocate bandwidth to the different types of traffic, thereby optimizing the available bandwidth provided by the communications link.

Abstract: A switched telecommunications network includes a plurality of interconnected switching devices and a plurality of access bandwidth managing devices. A transmitting access bandwidth managing device is arranged to compress user originated data for transmission over the network to a receiving access bandwidth managing device. The receiving access bandwidth managing device is arranged to de-compress the received data for transmission to a receiving user. However, while the data is being transmitted through the network, it remains in compressed form, thereby minimizing the introduction of distortion and loss. Compressed data is transmitted through standard switching equipment by adding blank data to switched words, without decompressing the actual compressed data itself.

Abstract: In a noise cancellation system an adaptive filter produces a noise cancellation signal. The cancellation signal is compensated in response to indications of timing variations. For a linear traversal filter compensating coefficients (25) are provided which combine with, or relace, their respective primary coefficients when a timing variation occurs. Higher order compensating coefficients may be provided for selected taps and a modular structure is adopted thus facilitating implementation in integtrated form.