Multiplex communications – Wide area network – Packet switching
Patent
1982-09-09
1985-01-22
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
34082505, 370 89, H04J 300
Patent
active
044956177
ABSTRACT:
A circuit for signal generation and synchronization is disclosed for a ring network in which a number of stations communicate with each other. The circuit, which is provided at each station in the ring, includes a phase locked loop which loosely couples the transmit and receive clocks of each station during a repeater mode of operation. During a transmit mode the receive and transmit clocks are de-coupled so that phase delay around the ring does not degrade the transmit clock each time a transmission is initiated. The circuit includes logic gates for detecting the transmission of a token, means for generating a token and means for jam syncing the transmit and receive clocks to detect transistions in the incoming data during the repeater mode and after a token has been generated at the end of the transmit mode.
REFERENCES:
patent: 3456242 (1969-07-01), Lubkin et al.
patent: 4293948 (1981-10-01), Soderblom
patent: 4320515 (1982-03-01), Burton, Jr.
patent: 4320517 (1982-03-01), Godard et al.
patent: 4417242 (1983-11-01), Bapst et al.
"Synchronous Data Link Controller"; Western Digital Corporation; Apr. 1981, pp. 99-114.
"Clocking in the Ring"; Submitted to IEEE Project 802 on Apr. 27, 1981; M. R. Patel.
Ampulski Joseph W.
Bernal Ronald D.
Furukawa James N.
Kesner Donald R.
A.B. Dick Company
Olms Douglas W.
Scutch III Frank M.
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