A network switch is capable of supporting cut-through switching and interface channelization with enhanced system performance. The network switch includes a plurality of ingress tiles, each tile including a virtual output queue (VOQ) scheduler operable to submit schedule requests to a fabric scheduler. Data is requested in unit of quantum, which may aggregate multiple packets, and which reduces schedule latency. Each request is associated with a start-of-quantum (SoR) state or a middle-of-quantum (MoR) state to support cut-through. The fabric scheduler performs a multi-stage scheduling process to progressively narrow the selection of requests, including stages of arbitration in virtual output port level, virtual output port group level, tile level, egress port level, and port group level. Each tile receives the grants for its requests and accordingly sends request data to a switch fabric for transmission to the destination egress ports.

A system and method for measuring propagation delays and other delays in an optical switching system. A transmitter is connected, through a circuit switch, to a receiver. To measure the propagation delay between the transmitter and the receiver, the transmitter sends one or more time-tagged ranging messages and the receiver calculates a propagation delay from the difference between the time of receipt and the time of transmission. In another embodiment, a time delay between message transmission and transition of a CDR of the receiver to a fast acquisition mode is adjusted, by trial and error, to find a range of such time delays for which transmission is successful. A time delay between the transmitter and the switch is measured by establishing or breaking the connection and determining, for various tentative time delay values, whether transmission succeeds.

A system for transmitting concurrent data flows on a network, includes a memory containing data of data flows; a plurality of queues assigned respectively to the data flows, organized to receive the data as atomic transmission units; a flow regulator to poll the queues in sequence and, if the polled queue contains a full transmission unit, transmitting the unit on the network at a nominal flow-rate of the network; a sequencer to poll the queues in a round-robin manner and enable a data request signal when the filling level of the polled queue is below a threshold common to all queues, which threshold is greater than the size of the largest transmission unit; and a direct memory access configured to receive the data request signal and respond thereto by transferring data from the memory to the corresponding queue at a nominal speed of the system, up to the common threshold.

The present disclosure relates to a centralized scheduling method and apparatus that considers non-uniform traffic and, more particularly, to a centralized scheduling method and apparatus for performing effective scheduling based on a characteristic of non-uniform traffic in consideration of a traffic distribution in a data center network.

Provided is a procedure for receiving response information in response to a request message in an M2M system. Such a procedure may include transmitting a request message; determining a response type parameter corresponding to the request message; and receiving response information according to the response type parameter, wherein one of blocking, synchronous non-blocking (nonBlockingRequestSynch) and asynchronous non-blocking (nonBlockingRequestAsynch) is set as the response type parameter.

A bandwidth allocation device includes a buffer device, a main scheduler, an oversubscription scheduler, a multiplexer and a detecting device. The buffer device is arranged to receive first data units from first ports and second data units from second ports and accordingly output these data units. The main scheduler is configured to schedule the first data units and accordingly output the first data units in sequence. The oversubscription scheduler is configured to schedule the second data units and accordingly output the second data units in sequence. The multiplexer is controlled by the main scheduler to select the first data units outputted by the main scheduler and the second data units outputted by the oversubscription scheduler for outputting. The detecting device is arranged to generate power-related information which the main scheduler relies on to control the multiplexer.

A bandwidth allocation device includes a buffer device, a main scheduler, an oversubscription scheduler, a multiplexer and a detecting device. The buffer device is arranged to receive first data units from first ports and second data units from second ports and accordingly output these data units. The main scheduler is configured to schedule the first data units and accordingly output the first data units in sequence. The oversubscription scheduler is configured to schedule the second data units and accordingly output the second data units in sequence. The multiplexer is controlled by the main scheduler to select the first data units outputted by the main scheduler and the second data units outputted by the oversubscription scheduler for outputting. The detecting device is arranged to generate power-related information which the main scheduler relies on to control the multiplexer.

The present disclosure relates to a centralized scheduling method and apparatus that considers non-uniform traffic and, more particularly, to a centralized scheduling method and apparatus for performing effective scheduling based on a characteristic of non-uniform traffic in consideration of a traffic distribution in a data center network.

Certain aspects of the present disclosure relate to methods and apparatus for multiplexing scheduling requests (SRs), for example, using multiple SR resources to indicate different types of traffic (or traffic parameters).

Technologies for balancing throughput across input ports include a network switch. The network switch is to generate, for an arbiter unit in a first stage of a hierarchy of stages of arbiter units, turn data indicative of a set of turns in which to transfer packet data from devices connected to input ports of the arbiter unit. The network switch is also to transfer, with the arbiter unit, the packet data from the devices in the set of turns. Additionally, the network switch is to determine weight data indicative of the number of turns represented in the set and provide the weight data from the arbiter unit in the first stage to another arbiter unit in a subsequent stage to cause the arbiter unit in the subsequent stage to allocate a number of turns for the transfer of the packet data from the arbiter unit in the first stage.