Synchronization of terminal stations in a multirate half-duplex

Details Synchronization of terminal stations in a multirate half-duplex Synchronization of terminal stations in a multirate half-duplex

1992-03-20

1993-12-21

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

3701054, 375114, H04B 320

Patent

active

052726940

ABSTRACT:
The synchronization of a terminal station in a half-duplex tree-structured communication network consists in counting clock pulses in a central station. The pulses are counted between the emission of a forward frame including a synchronization word emission order that is intended for the terminal station, and the reception of the synchronization word emitted from the terminal station in response to the forward frame. As a function of the pulse count is computed a delay depending on the propagation time between the two stations so as to data sectors emitted by the terminal stations do not overlaps and form a backward frame whatever the different distances between the terminal stations and the central station. According to the invention, the counted pulses are pulses of a central clock signal phase-shifted to within a bit time fraction of the received words. The time intervals attributed to the sectors are thus determined more accurately. The central clock signal depends on the operating rate of the terminal station, and the network can then carry multirate frames. The invention also remedies to variations of propagation time between the stations caused by thermal drifts by modifying clock signals to regenerate sectors in the central station.

REFERENCES:
patent: 5014272 (1991-05-01), Yoshida
patent: 5046074 (1991-09-01), Abiven et al.
patent: 5177739 (1993-01-01), Basnuevo et al.

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