In accordance with the preferred embodiments of the present invention, a method (400) and an apparatus (e.g., base station (140)) for enabling a communication resource reset are described herein. In particular, a controller (e.g., a base station controller (120)) and a communication resource (e.g., a base station (140)) are in communication via a communication link (250). The method (400) provides a physical layer element (320) that is operatively coupled to the communication link (250). Further...

A method and apparatus are disclosed for assessing the available resources in a network and using the assessment for admission control. A VoIP call can be established with a device only if the network has sufficient resources to accommodate the call or it is possible to make such resources available by curtailing ongoing data connections. A network utilization characteristic (NUC) provides a measure of network capacity. The network utilization characteristic of a flow is the fraction of time the...

A method that utilizes virtual channels and a common pool of credits, controlled by a transmitter to maximize the throughput across an Inter-Switch Link in a Fibre Channel network. Each virtual channel is allocated a minimum number of credits and the remaining credits of the ISL are held in a common pool. When needs arise, the credits in the pool will be allocated or reallocated to make the best use dynamically by the transmitter.

Packet flow rate control techniques are enhanced by the interactive and early invocation of packet queuing to control short flows of packets and to eliminate undershoot and overshoot of a targeted flow rate. Packet queuing involves the scheduled release of packets in accordance with flow policies (priorities) to achieve a preselected outgoing target flow rate. The combination of controlled packet queuing and packet flow rate control with appropriate mechanisms for favoring one over the other imp...

An idle frame counter is not reset after retransmission of a data frame. Additionally, if a non-acknowledgment (NAK) is received for the last data frame sent, then no more idle frames are transmitted. Finally, an Idle Acknowledgment (ACK) is transmitted when an idle frame has been received with a sequence number equal to the sequence number of the next new data frame expected.

To determine the transmission efficiency of a data communication network in order to raise the data throughput, the transmission-time, that means the time actually used for user data transmission, is determined. By building the ratio of the transmission-time and the duration of the respective user data transfer session the network operator can measure the transmission efficiency. Depending on the transmission efficiency he then can improve the data throughput by either raising the transmission e...

A cable TV system, which is arranged to permit a transmission of signals in the return direction from local networks (10), included in the system, to a head end (11) of the system within a predetermined carrier frequency band, serving for the transmission of signals in said direction, comprises means (11', 23) for monitoring the system in respect of disturbances occurring within said carrier frequency band. Said monitoring means (11', 23) comprise detector means (32, 33, 34, 35) within each loca...

Disclosed is an Active Queue Management method and apparatus which uses traffic rate information for congestion control. Using a nonlinear fluid-flow model of Traffic Control Protocol, an integral controller in a closed loop configuration with gain settings characterized for stable operation allows a matching of the aggregate rate of the active TCP connections to the available capacity. Further disclosed is a method for calculation of the regime of gains for which stable operation of a given net...

A method for transmitting packets classified according to QoS requirement from a transmitting node to a receiving node is provided, the transmitting node being configured to select sequentially a QoS class, to divide a queued packet to be transmitted, which belongs to the selected class, into a plurality of predetermined data units, to transmit one of the predetermined data units, and to apply a transmitter-side retransmission control process to the data unit to be transmitted when the selected ...

An optical scanner includes a single deflector to optically scan a plurality of target surfaces to be scanned. The deflector has a common rotary axis for deflecting reflective surfaces and is shared by all the beams from a plurality of light sources. The optical scanner includes photodetectors arranged to receive the beams deflected at the deflector. The beams traveling toward the deflector have an open angle in a deflecting rotation plane. A scanning optical system for guiding the deflected bea...