Router time setting query

I have a Solwise SA110 router connected to my PC via a bog standard network
card. I use a GPS receiver to keep my PC clock accurate (Yeah I know it is
overkill but it was an interesting project to implement and the signal is
already available to me) as well as another timekeeping application. I am
aware that there are various utilities that will broadcast the time (SNTP?)
across the network. Is there some way I can get the router to recognise
these broadcasts and thus keep the time correct. I have had a fiddle with it
using Tardis but no success yet. Any helpful suggestions would be welcome.
TIA

(E-Mail Removed)

On Sun, 28 Sep 2003 19:00:27 +0100, "Peter Crosland"
<(E-Mail Removed)> wrote:

>I have a Solwise SA110 router connected to my PC via a bog standard network
>card. I use a GPS receiver to keep my PC clock accurate (Yeah I know it is
>overkill but it was an interesting project to implement and the signal is
>already available to me) as well as another timekeeping application. I am
>aware that there are various utilities that will broadcast the time (SNTP?)
>across the network. Is there some way I can get the router to recognise
>these broadcasts and thus keep the time correct. I have had a fiddle with it
>using Tardis but no success yet. Any helpful suggestions would be welcome.

Are you aware of the CLI commands for SNTP on the SA110 ? Have a
gander at the CLI documentation ( link to Solwise download section on
UK-Bug : http://snurl.com/2hwx ), but basically the commands are :

for configuration ...
create sntp servaddr
delete sntp servaddr
get sntp servaddr
modify sntp cfg
get sntp cfg

and for statistics ...
get sntp stats
reseet sntp stats

HTH

--
Andy Jenkins
UK Broadband Usergroup : http://www.uk-bug.net

Thanks Andy. Much appreciated.

--
(E-Mail Removed)

GPS isn't that accurate... not like an atomic clock at a uni or similar - it
is about 8 seconds out. Small point but I thought I'd mention it. There are
better ways of keeping your PC clock sync'ed

all down to the leap seconds.


"Peter Crosland" <(E-Mail Removed)> wrote in message
news:bl77jt$a10$(E-Mail Removed)...
> I have a Solwise SA110 router connected to my PC via a bog standard
network
> card. I use a GPS receiver to keep my PC clock accurate (Yeah I know it is
> overkill but it was an interesting project to implement and the signal is
> already available to me) as well as another timekeeping application. I am
> aware that there are various utilities that will broadcast the time
(SNTP?)
> across the network. Is there some way I can get the router to recognise
> these broadcasts and thus keep the time correct. I have had a fiddle with
it
> using Tardis but no success yet. Any helpful suggestions would be welcome.
> TIA
>
> (E-Mail Removed)
>
>

My misunderstanding. I want the router to recognise the NTP broadcast from
my machine rather than look to an SNTP server. Maybe this is not possible
but if it is I can't see how to do it!

(E-Mail Removed)

> GPS isn't that accurate... not like an atomic clock at a uni or similar -
it
> is about 8 seconds out. Small point but I thought I'd mention it. There
are
> better ways of keeping your PC clock sync'ed
>
> all down to the leap seconds.

Before making such sweeping statements about GPS it might have beeen worth
checking the specification of the equipment I use as well as researching the
subject a little more. Certainly the accuracy of the clock derived from the
NMEA strings output from consumer grade GPS units is subject to quite
significant errors. However, I am using a commercial grade GPS that outputs
a 1PPS signal to the computer. This is used by the software to set the
computer clock. The software is configured to compensate for timing losses
in the coax cable run from the GPS antenna to the receiver and the GPS and
computer internal signal paths. The accuracy is much higher than can be
achieved by using an internet SNTP server. Not as accurate as a full blown
atomic clock of course but very close in practical terms.

As they say in the Midlands please consider winding your neck in!

UncleWobbly wrote:
> GPS isn't that accurate... not like an atomic clock at a uni or similar - it
> is about 8 seconds out. Small point but I thought I'd mention it. There are
> better ways of keeping your PC clock sync'ed
>
> all down to the leap seconds.

Take a look at http://gpsinformation.net/main/gpstime.htm which
describes the time keeping of the GPS system. It can apparently be
accurate to about 40ns. The time is different to UTC but a correcting
value is broadcast.

PS. Selective Availability, SA, is off at the moment.

--
Dave Roberts

>
> Take a look at http://gpsinformation.net/main/gpstime.htm which
> describes the time keeping of the GPS system. It can apparently be
> accurate to about 40ns. The time is different to UTC but a correcting
> value is broadcast.
>
I would also add that most cellular networks have GPS derived time signals
keeping them in sync as do many computer networks.

> PS. Selective Availability, SA, is off at the moment.

And is likely to never return.

On Sun, 28 Sep 2003 19:59:32 +0100, "Peter Crosland"
<(E-Mail Removed)> wrote:

>My misunderstanding. I want the router to recognise the NTP broadcast from
>my machine rather than look to an SNTP server. Maybe this is not possible
>but if it is I can't see how to do it!

Given the command parameters I gave you in the other post, I cannot
see any reason why you could'nt just specify the LAN IP of the NTP
host, instead of a server on the internet.

Have you tried this ?

--
Andy Jenkins
UK Broadband Usergroup : http://www.uk-bug.net

Thanks Andy. No luck there but remember I am a complete novice at this so I
may well have something else wrong in my PC or router setup.
Guess I shall have to buy myself on TCP/IP and try to comprehend it.

(E-Mail Removed)