[ntp:questions] ntp server specs

David J Taylor david-taylor at blueyonder.co.uk.invalid
Wed Jun 15 05:19:29 UTC 2011

> The problem with both of those is that the Linux machines are all
> going to want the PPS to be conected to the DTR pin of a serial port
> and for that you need rs-232 levels with wides plus and minus volts.
> TTL level or wose is not going to work.
> Chris Albertson
> Redondo Beach, California

In practice, many RS-232 ports on computers will work perfectly with TTL 
levels.  It's the DCD (carrier detect) line to which the PPS is fed on my 


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