Cisco Technology, Inc.

William Keith Brewer

William Patrick Hann

Richard L House

Matthew Irvin

Robert H Locklear, Jr

John Francis McHale

James R Sisk

Craig S Cantrell

Clifford L Hall, Iii

Kip R McClanahan

Anthony J P Carew

A system for managing data communication between physical layer devices and ATM layer devices in a cell based ATM network is disclosed. A plurality of low speed physical layer devices a high speed physical layer device are connected to a bus. A bus interface device is coupled to the bus, the low speed physical layer devices, and the high speed physical layer device. The bus interface device is operable to provide equal opportunities to access the bus to any connected physical layer device. An arbiter is coupled to the low speed physical layer devices, the high speed physical layer devices, and the bus interface device. The arbiter is operable to provide the high speed physical layer device with disproportionately frequent access to the bus.

System and method of operation for managing data communication between physical layer devices and ATM layer devices

A system for managing data communication between physical layer devices and ATM layer devices in a cell based ATM network includes a plurality of low speed physical layer devices, a high speed physical layer device, and a bus connected to the physical layer devices. A bus interface device is coupled to the bus, the low speed physical layer devices, and the high speed physical layer device. The bus interface device permits equal opportunities to access the bus to any connected physical layer device. An arbiter is coupled to the low speed physical layer devices, the high speed physical layer device, and the bus interface device. The arbiter provides the high speed physical layer device with disproportionately frequent access to the bus.

A method and apparatus are provided for generating parity for communication between a physical layer device and an ATM layer device is provided. A data bus is monitored for data comprising an ATM cell transmitted from a physical layer device to an ATM layer device. The header error check of the ATM cell is verified and parity for the ATM cell is generated. Parity is provided to the ATM layer device if the header error check is correct.

Method and apparatus for generating parity for communication between a physical layer device and an ATM layer device

A communication system includes an access server that communicates information between a wide area network (WAN) and a local area network (LAN). The access server includes a WAN interface, a switch fabric, a number of route processors, and a LAN interface. The switch fabric directs information from the WAN interface to a selected route processor based on its loading characteristics.

Switched architecture access server

A communication server (700) is disclosed and includes a plurality of XDSL transceiver units (710) and a plurality of line interface modules (702). Each line interface module (702) has a plurality of inputs each coupled to a twisted pair data line. Each line interface module (702) also has a plurality of outputs each associated with one of the XDSL transceiver units (710). Each line interface (702) is operable to couple a requesting twisted pair data line to an output associated with a selected XDSL transceiver unit (710). The communication server (700) also includes a network interface (714) that has a plurality of inputs coupled to associated XDSL transceiver units (710). The communication server (700) further includes a system controller (712) coupled to the XDSL transceiver units (710), to the plurality of line interface modules (702) and to the network interface (714). The system controller (712) is operable to select an available XDSL transceiver unit (710) in response to a detected request for data service and to direct the line interface module (702), to which the twisted pair data line requesting data service is coupled, to connect the requesting twisted pair data line to the selected XDSL transceiver unit (710).

Growing community of inventors

Austin, TX, United States of America

William Keith Brewer