System uses time pulse that simultaneously transmits with time of day message to synchronize network user stations
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United States of America Patent
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Feb 8, 2005
Issued Date -
N/A
app pub date -
May 14, 2001
filing date -
Nov 13, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A network user system and a method of using the same in which one network user station (2c) is connected with another network user station (2a) via a message line (9a) and to which, in a receive mode, the other network user station (2a) can transmit a time message (Un, 5) comprising a time of day. The network user station (2a) also simultaneously transmits along with the time message a plurality of time pulses to the other network user stations (2b, 2d , 2e. . . ) in the system. The network user stations (2a, 2b, 2c, . . . ) record the time difference between the instant when the time pulses Tp are received and the instant when the time message (5) is received, and thereupon adjust the time of day contained in the time message (5) based on the time difference. This ensures that the time of day that is further processed in the receiver (4a, 4b, 4c. . . ) is the correct time at the instant of processing and, further, that the clock (6) of the network user station (2a) and the clock (8) of the other network user station (2c) are substantially synchronized. To measure the time difference in a simple manner, a timer is provided, which is started by the time pulse (Tp) and stopped by the time message (5).
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