[ntp:questions] ntp server specs

C BlacK rblak at non.net
Tue Jun 14 22:27:43 UTC 2011


For our discussion, lets say there are many machine but the distance is not going to me more that 100ft.



On 06/13/2011 02:08 AM, Chris Albertson wrote:
> On Sun, Jun 12, 2011 at 3:55 PM, chipper <black at intre.nt> wrote:
>> If I wanted to feed a group of linux machine from a common PPS source, what
>> hardware and which Linux would I need?
> 
> 
> So now you are saying yu are NOT gong to use NET over Ethernet but
> send a PPS to each computer.
> That can work but yu will need to build a PPS distribution network.
> The first quuestion Ihave is what is the distance.  Are al the
> computers in one room, in the same rack? or is this a large campus and
> some are 1,000 feet away.   It can be done.   You can use cat-5 wire
> for a PPS and it will go abut as far as Ethernet but of course hubs
> and switches will not work.
> 
> ANy recent Linux kernel will work.  It needs to have PPS built-in.
> 
> A reasonable design would be to have NTP serve the time to the
> computers using some pool servers as a reference and then also
> distribute PPS
> 
> At home I push PPS throough cat-5 wire for abut 80 feet and I use an
> RS-232 driver chip and send the signal over cat-5 at rs232 voltage
> levels.   I would not try to send TTL level that far.  For very long
> runs use RS442.  442 is good or for at least 1,000 feet.
> Chris Albertson
> Redondo Beach, California




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