Double-buffered time division switching system
AssigneeNEC Corporation
InventorTsuneo Kobayashi
Life of this patent
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Abstract
The invention relates to a time division switching system which may transmit both voice and data signals. The data signals may be transmitted at a much higher speed than the voice signals, such as twice the speed, for example. To do this, the data signals are split into two time slots which are separately transmitted. Since the two time frames are so closely related, they must be transmitted within the same frame as a unit. This is done by a combination of two memory switches and control means for transmitting multi-element information. The two memory switches are used in an alternating sequence.
Claims11
A double-buffered time division switching system comprising:
- first and second K-bit.times.N-multiplex memory switches, into whose N time slots per frame are sequentially inputted time division multiplexed data, either of said memory switches may be placed in a write state;
- a control memory for storing the read sequence of data in said first and secont memory switches;
- first and second multi-element information memories for storing multi-element information which indicates, corresponding to a plurality of input time slots constituting a series of data in said frame, that these time slots are multi-element data;
- first control means for checking said first multi-element information memory in synchronism with the writing of input time slots into said memory switches and, if said multi-element information is stored corresponding to the time slots into which to write in said information, alternately switching the data writing of the time slots between said first and second memory switches on a frame-by-frame basis;
- and
- second control means for checking said second multi-element information memory in synchronism with the reading into output time slots from said memory switches and, if said multi-element information is stored corresponding to the time slots to output said information, alternately outputting into the output time slots data which is read out of said first memory switch and data which is read out of said second memory switch on a frame-by-frame basis.
A time division switching system for transmitting both voice and data signals, said data signals having a transmission speed which is higher than the transmission speed of said voice signals, said switching system comprising first and second memory switches for transmitting data in a plurality to time frames, a pair of multi-element information memories for storing data signals, and control means responsive to information contained in said data signals for writing said data from said multi-element information into said memory switches, whereby said writing of said data does not have to be carried out in a cyclically periodic manner, said control means alternatingly writing parts of one of the data into the first and second memory switches whereby the parts of data stored in said first and second memory switches corresponds to said one data, said control means reading out said memory switches so that said corresponding data is sent in separate time slots in the same time frame.
Dependencies are inferred from the claim text.