Cisco Technology, Inc.

Kenneth M Buckland

Riccardo G Dorbolo

Barry W Field

Earl B Manchester

Jan C Hobbel

Soren Pedersen

Thomas A Potter

Danny Thom

Robert D Howson, Jr

Charles R Dyer

Richard F Sustek

A method and system for processing traffic in an access network includes receiving a plurality of ingress traffic streams from customer premise equipment (CPE). Each ingress traffic stream includes a plurality of Internet Protocol (IP) packets having an IP address. The ingress traffic streams are aggregated into a combined traffic stream without regard to the IP addresses. The combined traffic stream is transmitted to a backbone network for routing based on the IP addresses. An egress traffic stream is received from the backbone network and includes a plurality of IP packets each having an IP address. A CPE port is determined for each IP packet based on its IP address. The IP packets are routed to their respective CPE ports and transmitted to their destination CPEs.

Method and system for processing traffic in an access network

An asynchronous transfer mode (ATM) switch includes a switch memory having a plurality of discrete queues. A queue is dedicated to a connection in which a traffic stream is transmitted in cells and an inverse multiplex ATM (IMA) format. A switch controller is operable to receive a plurality of cells, to identify cells for the connection, to queue cells for the connection in the queue based on order information received with the cells, to reconstitute from the queue the traffic stream, and to switch the traffic stream and the ATM cells.

Asynchronous transfer mode (ATM) switch and method for switching ATM traffic

A method and system for transmitting traffic having disparate rate components includes receiving a plurality of traffic streams. Each traffic stream includes a first component and a reduced rate second component associated with the first component. The first components of the traffic streams are segmented into successive cells. The second components of the traffic streams are distributed between a defined set of the cells for in-band transmission of the second components.

Method and system for transmitting traffic having disparate rate components

An ATM switch is configured to route ATM traffic from two receive circuits to a destination. One copy of this traffic is discarded in one of the receive circuits so that only a single copy is passed to the ATM switch. Receive circuits contemplate both virtual path (VP) level and card or circuit level metrics for qualification of signals.

Method for using a pre-configured ATM switch and traffic discard to facilitate UPSR selection

A TDM switch is configured to route TDM traffic from two receive circuits to a destination. One copy of the traffic is discarded, and a memory selectively stores the other copy for routing to the TDM switch. Receive circuits contemplate both virtual tributary (VT) level and card or circuit level metrics for qualification of signals.

Method for using a pre-configured TDM switch and traffic discard to facilitate UPSR selection

A time slot interchanger (TSI) for a telecommunications node includes an exchange memory and a controller. The exchange memory includes a plurality of exchange memory slots. Each exchange memory slot is sized to store a traffic channel and includes a plurality of discretely addressable fields sized to store a sub-channel. The controller is operable in response to predefined switching instructions to write a sub-channel received in a first traffic channel to a first field in a memory slot and to write a sub-channel received in a second traffic channel to a second field in the memory slot.

Time slot interchanger (TSI) and method for a telecommunications node

A synchronous bus for a telecommunications node includes a frame repeating at a defined interval. Each frame includes a plurality of service channels. In at least one frame, a service channel individually transports traffic for a DS-0 connection. A set of service channels in the frame together transport an asynchronous transfer mode (ATM) cell.

Method and system for transporting synchronous and asynchronous traffic on a synchronous bus of a telecommunications node

Asynchronous transfer mode (ATM) switch and method

A synchronous switch for a telecommunications node includes a switch interface, a switch controller, and a switch memory. The switch interface is operable to terminate a bus and to receive from the bus a frame having a plurality of time slots. The time slots are each operable to transport a traffic cell. The switch controller is operable to determine a type for each traffic cell received at the switch interface and to determine based on the type for a traffic cell an address for storing the traffic cell in the switch memory. The switch memory is operable to receive the traffic cell from the switch interface and the address for storing the traffic cell from the switch controller and to store the traffic cell at the address.

Synchronous switch and method for a telecommunications node

A rate adjustable backplane includes a set of switch slots configured to receive one or more switch cards forming a switch core and a plurality of line slots each configured to receive a line card. A low speed bus couples the line slots to the set of switch slots. A high speed bus also couples the line slots to the set of switch slots. Each line slot includes a low speed connector coupled to the low speed bus and a high speed connector coupled to the high speed bus. The low speed connector is adapted to receive a mating connector of a line card to establish a low speed communication connection between the line card and the switch core. The high speed connector is adapted to receive a mating connector of the line card to establish a high speed link between the line card and the switch core.

Rate adjustable backplane and method for a telecommunications node

A bus for a telecommunications node includes a frame repeating at a defined interval and including a defined number of slots. Each slot includes an overhead portion identifying a type of traffic in the slot and a service traffic portion transporting traffic of the type. A first slot in at least one frame transports in the service traffic portion asynchronous traffic and routing information for the asynchronous traffic in the telecommunications node. A second slot in the frame transports synchronous traffic in the service traffic portion and has a location in the frame associated with routing information for the synchronous traffic in the telecommunications node.

Method and system for transporting synchronous and asynchronous traffic on a bus of a telecommunications node

A switch card for telecommunications node includes a shared memory operable to store traffic channels. A time slot interchanger (TSI) is coupled to a first bus and to the shared memory. The TSI is operable based on predefined switching instructions to access the shared memory to stored traffic channels received from the first bus and to retrieve traffic channels for transmission on the first bus. An asynchronous transfer mode (ATM) switch is operable to switch a traffic cell based on header information in the traffic cell. A traffic converter is operable to convert traffic channels retrieved from the shared memory to traffic cells for processing by a bus fuser and to convert traffic cells to traffic channels for storage in the shared memory. The bus fuser is coupled to the shared memory through the traffic converter, the ATM switch, and a second bus. The bus fuser is operable to receive a traffic cell from each one of the traffic converter, the ATM switch, and the second bus and to route the traffic cell to another one of the traffic converter, the ATM switch, and the second bus.

Fused switch core and method for a telecommunications node

A single ATM traffic stream is carried over a plurality of lower bandwidth media, such as T- or E- interfaces, using inverse multiplexing assisted by a prepended byte at the beginning of each ATM cell, the byte containing a key to permit recovery of the proper order of ATM cells.

Method for inverse multiplexing of ATM using sample prepends

A system and method for transporting telephony signals across an ATM network using AAL1 while eliminating the jitter associated with the AAL1 cells. The present invention uses starve/inspect techniques to dynamically buffer the ATM frames such that jitter associated with the cells can be reduced while avoiding unneeded buffering that would cause excessive delay.

System and method for eliminating jitter by using a starve/inspect approach to AAL1

A universal DS- channelized format is provided wherein selected states of CAS bits are used to indicate to the transport mechanism when DS- channels are not being used for voice and are available for use for data transport. In addition, the T frame format carries CAS bits only in the first DS- channel, so that robbed bits are disabled and not used to carry ABCD signaling bits, thereby avoiding any risk of data corruption. Still further, a special CAS signaling value not defined as a CAS state, is employed in a frame nibble instead of a frame counter to indicate that the state is in the first DS- slot.

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Santa Rosa, CA, United States of America

Kenneth M Buckland