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DES-7200 Configuration Guide Chapter 4 SNTP
Configuration
Receive Timestamp T2 time request received at server
Transmit Timestamp T3 time reply sent by server
Destination Timestamp T4 time reply received at client
T1: time request sent by client(refer to the client time) with the mark “Originate
at server(refer to the server time) with the mark
er time) with the mark “Transmit
to the client time) with the mark
”.
een the Server and the Client
ver and the Client
calculates the time:
∴
d = (T4 ∴ - T1) - (T3 - T2);
Then, a e of t and d, SNTP Client gets the current time: T4+t.
4.2 Conf
Timestamp”;
T2: time request received
“Receive Timestamp”;
T3: time reply by server(refer to the serv
Timestamp ”;
T4: time reply received at client(refer
“Destination Timestamp
T: time deviation betw
d: time between the Ser
The following formula
T2 = T1 + t + d / 2; ∵
T2 - T1 = t + d / 2;
T4 = T3 ∵ – t + d / 2;
T3 ∴ - T4 = t – d / 2;
t = ((T2 - T1) + (T3 - T4)) / 2;
ccording to the valu
iguring SNTP
Th chapter describes how to configuis re the SNTP.
a
z Configuring the IP address for the NTP server.
z uring the local time-zone.
z Default configuration.
z En bling SNTP.
z Configuring the SNTP sync interval.
Config
4-2