Abstract A method of transmitting voice signals from a source exchange telephone device (10) to a destination exchange telephone device (12) through a packet switching network (26) is disclosed, which comprises the steps of packetization of the digital samples received in a TDM frame from the source exchange telephone device into a data packet by putting into the first byte of the packet the first digital sample obtained by applying a frame slot/packet byte one-to-one mapping, putting into the second byte of the packet the second digital sample obtained by applying the one-to-one mapping to the remaining digital samples, and so on until all digital samples of said plurality of digital samples have been put into said data packet, and depacketization of the packet consisting in placing the first byte of the packet into a slot of a TDM frame to be transmitted to the destination exchange telephone device by applying the same one-to-one mapping to the first byte, placing the second byte of the packet into a slot of the TDM frame by appplying the one-to-one mapping to the second byte, and so on until all bytes of the packet have been placed into the TDM frame.
Method of transmitting voice signals from a source exchange telephone device (10) to a destination exchange telephone device (12) through a packet switching network (26) including an input access node (28) which is connected to said source exchange telephone device for receiving a plurality of digital voice signal samples from a plurality of voice signal terminals such as telephone sets with said plurality of digital samples being received in a same plurality of time slots of a time division multiplex (TDM) frame, and an output access node (30) connected to said destination exchange telephone device for transmitting thereto said plurality of digital voice signal samples with said plurality of digital samples being transmitted in a same plurality of time slots of a time division multiplex (TDM) frame ; said method being characterized by the following steps : packetization, by said input access node, of said plurality of digital samples received in a TDM frame from said source exchange telephone device into a data packet, said packetization consisting in putting into the first byte of said data packet the first digital sample obtained by applying a frame slot/packet byte one-to-one mapping to said plurality of digital samples, putting into the second byte of said data packet the second digital sample obtained by applying said one-to-one mapping to the remaining digital samples, and so on until all digital samples of said plurality of digital samples have been put into said data packet, and depacketization of said data packet by said output access node, consisting in placing the first byte of said data packet into a slot of a TDM frame to be transmitted to said destination exchange telephone device by applying said frame slot/packet byte one-to-one mapping to said first byte, placing the second byte of said data packet into a slot of said TDM frame by applying said one-to-one mapping to said second byte, and so on until all bytes of said data packet corresponding to said plurality of digital samples have been placed into said TDM frame.
Claim 2
Dependent Claim
106 words
Method according to claim 1, wherein said frame slot/packet byte one-to-one mapping consists in making the step of packetization by putting the circuit located into the frame slot having the lowest number into the first byte of the packet, then putting the circuit located into the frame slot having the next lowest number into the second byte of the packet, and so on, making the step of depacketization by placing the first byte of the packet into the usable frame slot having the lowest number, then placing the second byte of the packet into the usable frame slot having the next lowest number, and so on.
Claim 3
Dependent Claim
35 words
Method according to claim 1 or 2, wherein the time division frame exchanged between said source or destination exchange telephone device and its connected access node comprises 32 slots and has a duration of 125µs.