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US 4,049,908 AGranted
Method and apparatus for digital data transmission
AssigneeSiemens Aktiengesellschaft
InventorsEberhard Knorpp, Silvian Schaffer
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AssigneeSiemens Aktiengesellschaft
InventorsEberhard Knorpp, Silvian Schaffer
Estimating the term…
A method and apparatus for transmitting digital data between subscriber stations and a subscriber concentrator and using time hybrids are described. The two-wire lines connecting the subscriber stations to a concentrator are utilized on a four-wire basis, and operate on a time interleaved manner of actuating the send and receive modes of operation of the time hybrids. The send mode of the time hybrid at the subscriber concentrator is actuated responsive to a synchronizing pulse from the concentrator. The send mode of the time hybrid associated with the subscriber stations occurs upon acceptance of data over the two-wire line and a specific time relationship is established between the received data and the initiation of the send mode. In both types of time hybrids a receive pause occurs between the send mode and the subsequent receive mode, and the pause is of a duration corresponding to the anticipated maximum transit time over the two-wire line. In the time hybrids allocated to the subscriber stations a send pause is placed between receive mode and subsequent send mode which in its leading portions corresponds in time with the receive pause of the time hybrid in the concentrator.
A method of transmitting digital data in a time division multiplex (TDM) telecommunication system between subscriber stations and a concentrator connected to said subscriber stations by means of two-wire lines operating on a four-wire basis, wherein said digital data is coupled through time hybrid circuits at said subscriber stations and through a time hybrid circuit at said concentrator, comprising the steps of:
In a time division multiplex (TDM) telecommunication system for transmitting digital data signals wherein subscriber stations are connected to a concentrator associated therewith by two-wire lines operating on a four-wire basis, the transmitted digital data signals being coupled through time hybrid circuits at said subscriber stations and at said concentrator, said time hybrid circuits operating to have time-interleaved send and receive modes, the improvement comprising:
Dependencies are inferred from the claim text.