Motorola Corporation

Richard B Kline

Krishnan Ramakrishnan

Levent Gun

Craig Sheppard Holt

Dennis Ng

A communication system transmits packetized voice data from a voice source to a voice destination. At the voice destination, the packets are accumulated in a buffer, sequentially played out and the time the packet waits in the buffer is monitored. The time future voice packets are played out is accordingly adjusted.

Method and apparatus for adaptive smoothing delay for packet voice

A cell based network (100) for transmitting ATM user cells (118), including ABR data cells (118.sub.D) and forward control, or RM, cells (118.sub.FRM) at predetermined cell rates from at least one user source (102) in a virtual connection (VC, 110) through at least one ATM switch (120) and at least one transmission link (130) in the network to at least one user destination (104), employs a method and apparatus for controlling a user source (102) transmission cell rate in the presence of congestion in the VC (110). The calculation of a Fair Share cell transmission rate is written into a backward control, or RM, cell (118.sub.BRM) optionally takes place only in the presence of congestion at an ATM Switch (120). The calculation of the Fair.sub.-- Share value is simplified and calculation time is shortened by changing the number of active ABR VCs (N.sub.ABR) to a factor of two (E.sub.NABR) and dividing the maximum cell transmission rate by E.sub.NABR.

Simplified calculation of cell transmission rates in a cell based netwook

The event scheduler (100; 200) and method (300) of the present invention solve the problem of mixing multiple service categories on the same physical link or media by utilizing a calendar queue scheduling method (i.e., based on prior actual transmission times of previous packets). The event-driven cell scheduler is, for example used in an asynchronous transfer mode ATM network and may, for example, be embodied in software, hardware and firmware.

Event-driven cell scheduler and method for supporting multiple service

A method (1200, 1500, 1600, 1700, 1800) and packet switch (500, 600, 700, 1400,1900, 2000) for efficient switching of a plurality of received packets from a plurality of ingress ports to a plurality of egress ports, using the steps of: A) storing the packets in memory; B) sending arrival information for each packet to a destination egress port for the packet; C) storing, in memory at each destination egress port, the arrival information; D) requesting, by each destination egress port, the packets from the packet memory in accordance with a predetermined scheme; and E) sending, by the packet memory, to the destination egress ports, the packets requested.

Efficient output-request packet switch and method

A cell based network (100) for transmitting cells (118), including data cells and control cells at predetermined cell rates from at least one user source (102) in a virtual connection, VC (110), through at least one switch (120) and at least one transmission link (130) in the network to at least one user destination (104) employs a method for controlling a user source (102) transmission cell rate in the presence of congestion in the VC (110). The calculation of a Fair.sub.-- Share value of the Explicit Rate (ER) that is written into a backward control cell takes place only in the presence of congestion at either an Ingress Switch Port (141) or on an Egress Physical Port (162) connected to the Switch (120).

Method and apparatus for controlling cell transmission rate in a cell

A method and device are provided for efficient switching of multipoint packets in an output request packet switch, the multipoint packets being switched from a plurality of input ports to a plurality of egress ports where at least one packet is to be delivered to at least two destination egress ports.

Method and device for multipoint switching and arbitration in

A method for distributed voice conferencing in a fast packet network packetizes the speech into speech fast packets. The speech fast packets are transmitted to a central conference handier. The conference handier then provides the speech fast packets to the appropriate users. Another method of voice conferencing in a fast packet network is to send the speech fast packets directly to every other user in the voice conference.

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E. Walpole, MA, United States of America

Richard B Kline