Pulse or digital communications – Synchronizers – Network synchronizing more than two stations
Patent
1994-01-31
1995-10-31
Chin, Stephen
Pulse or digital communications
Synchronizers
Network synchronizing more than two stations
3408252, H04L 700
Patent
active
054636639
ABSTRACT:
An apparatus for controlling synchronization in a system having at least first and second units each having internal circuits includes signal paths through which a control signal output from a second unit is sent to a first unit and a control signal output from the first unit is sent to the second unit. A first preparatory process part carries out a process to place the internal circuits of the second unit in an operating state when the second unit is connected to the system and for outputting a control signal to the signal paths. A first function mask control part is provided for stopping the operation of the internal circuits of the second unit when a control signal from the first unit is not received by the second unit, and for restarting the operation of the internal circuits when the control signal is received. A second preparatory process part carries out a process to place the internal circuits of the first unit in an operating state when the control signal from the second unit is received by the first unit, and for outputting a control signal to the signal paths. A second function mask control part is provided for stopping the operation of the internal circuits of the first unit when the control signal is not received, and for re-starting the operation of the internal circuits when the control signal is received.
REFERENCES:
patent: 3876983 (1975-04-01), Zafiropulo et al.
patent: 4417242 (1983-11-01), Bapst et al.
Hatakenaka Nobuko
Maruyama Takumi
Onodera Takashi
Uno Hiroaki
Yokoshi Noriyuki
Chin Stephen
Fujitsu Limited
Phan Hai H.
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