[ntp:questions] Re: 1pps signal,20us width

Paul Croome Paul.Croome at softwareag.com
Fri Nov 5 07:27:23 UTC 2004


Fei,

The PPS signal is usually connected to the DCD pin of a computer's
serial port, where it triggers interrupts. As long as each pulse is
long enough to trigger, it doesn't matter how long it is. The
pulse length is not related to the port's baud rate, so changing
that won't help you.

You won't really improve performance by distributing the master clock
signal to several stratum-1 servers -- you still have a single point
of failure. Consider using one stratum-1 server and a couple of
stratum-2 servers. That's easier to wire up and just as reliable as
your suggested configuration.

Paul



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