David Lord wrote:
......
Next experiment is to try type 22 atom driver without type 20
nmea driver and have the three ntp servers for giving the
correct second. I'll try with parallel pps first since I was
unable to get this to work on desktop downstairs and it is
already wired up for that.
This just does not appear to work on NetBSD and a refclock
is needed otherwise I get exact same as when tried on desktop.
ie. I'd need both serial and parallel cables so might as well
just use the serial. First indications are that parallel
might be giving slightly lower offset and jitter but for my
needs the extra cable is probably not worthwhile.
I've now tried with atom driver with pps connected to both lpt
and serial dcd at same time, with /dev/pps0 via ppbus then
symlink /dev/pps0 -> /dev/tty00.
With atom driver alone, PPS(0) remains unreachable.
With addition of NMEA driver PPS(0) takes over a few minutes
after NMEA has been selected.
Below seems best option as it avoids use of fudge 127.127.20.0 time1
and PPS(0) is selected here after only 7 minutes albeit still with
a long way to converge.
Now NMEA(0) 92u/6u and PPS(0) 75u/2u, 60 minutes after ntpd restarted.
David
Config:
pps to lpt0
pps to serial dcd
lpt0 at ppbus
pps0 at ppbus
crw-r--r-- 1 root wheel 164, 0 Feb 7 01:47 pps0
server 127.127.20.0 mode 1 prefer minpoll 6 maxpoll 8
server 127.127.22.0 minpoll 4 maxpoll 6
7 Feb 01:46:18 ntpd exiting on signal 15
7 Feb 01:47:38 clock PPS(0) event 'clk_noreply' (0x01)
7 Feb 01:51:58 synchronized to 192.168.59.60, stratum 2
7 Feb 01:51:58 kernel time sync status change
0x2001<PLL,NANO,MODE=0x0=PLL,CLK=0x0=A>
7 Feb 01:51:59 synchronized to GPS_NMEA(0), stratum 0
7 Feb 01:53:09 synchronized to PPS(0), stratum 0
remote refid st t when poll reach delay offset jitter
======================================================================
+GPS_NMEA(0) .GPS. 0 l 19 64 377 0.000 -1.680 253.141
oPPS(0) .PPS. 0 l 10 16 377 0.000 -1.652 0.150
-k6x400 xxx.xxx.xxx.xxx 2 u 26 64 377 0.740 0.822 0.778
+me6000g .PPS. 1 u 21 64 377 1.767 -0.439 0.309
-p4x2400c xxx.xxx.xxx.xxx 2 u 22 64 377 1.893 0.611 0.520
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