H - Electricity – 04 – J
Patent
H - Electricity
04
J
363/16
H04J 3/02 (2006.01) H04L 12/413 (2006.01) H04M 11/06 (2006.01)
Patent
CA 1196116
ABSTRACT The system allows packet synchronous speech communica- tions without requiring any centralized device synchron- izing all the network stations. Asynchronous, packet switched data traffic accesses the transmission line by means of a distributed contention algorithm, such as CSMA-CD. The access to the line for a speech communica- tion is obtained by the same contention technique used for data transmissions but, once a station has accessed the line for a speech communication, this communication is alloted a synchronous channel which is maintained for the whole communication duration. To obtain that, each station organizes its activity into frames, having a duration equal to the speech packetization time, and builds up independently, on a frame by frame basis, the busy period timing map, by monitoring the transmission line activity and recording the beginning instants of speech packets. Provided that at the occurrence of a particular busy period only the station that has booked it can transmit, each busy period in the map sets up a synchronous channel for a speech communication.
413143
Barberis Giulio
Bella Luigi
Brignolo Roberto
Sposini Maurizio
Ridout & Maybee Llp
Telecom Italia Lab Spa
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