Carrier Sense System With Continuous Bit Synchronism
Original Publication Date: 1988-Jan-01
Included in the Prior Art Database: 2005-Feb-14
The carrier sense multiple access (CSMA) system described below provides efficient clock bit acquisition, permits ease of encryption and improved protocol-conversion interfaces and eliminates the need for store-and-forward bridges. In Fig. 1, N stations 1-1 to 1-N have transmit logic (TL) coupled to receive logic R1-Rn of a time division multiplex (TDM) central station 2 by lines 3-1 to 3-N. Channel select logic 4 in central station 2 is coupled to time division multiplex logic 5 by outgoing channel paths 6-1 to 6-M. Transmit logic T1-Tn associated with multiplex logic 5 couples the output of 5 to receive logic (RL) in all stations via lines 7-1 to 7-N. Each station monitors the output of 5 and can initiate the transmission of a frame of data to channel select logic 4 only when no useful frame data is being output by 5, e.g.