Re: [ntp:questions] NTP emulation Question

2009-05-03 Thread Danny Mayer
Foden, Geoff wrote: > Hi there, > > > I am not an NTP expert at all, just investigating a test scenario that > has popped up. > > > We have a requirement stating that ...Each NTP client within [System > under Test] shall be capable of accessing at least six NTP sources. > > As we simply wil

Re: [ntp:questions] Gretchen - in regard to CertifiedTime it never died...

2009-05-03 Thread Danny Mayer
Todd Glassey CISM CIFI wrote: > Danny Mayer wrote: >> I have not documented any of your claims. Those are merely assertions on >> your part. > > No Danny they are NOT - what they are is clear documentation of the > gross failings of this group to meet Industry needs for the code.; > That's the r

Re: [ntp:questions] Gretchen - in regard to CertifiedTime it never died...

2009-05-03 Thread Gretchen Baxter
Correct me if I an wrong, but it seems like Todd has a problem with GPS and NTP and that is why his company exists. *GPS* - it can be spoofed, therefore it can NOT be trusted as a time source *NTP* - there is lack of security controls around it. In addition, it can be admitted as evidence in co

Re: [ntp:questions] PPS from an external OCXO source. Correcting drift is it possible?

2009-05-03 Thread John Ackermann N8UR
John Ackermann N8UR said the following on 05/03/2009 07:44 AM: > that can keep time to fractions of a microsecond. I have details of > that at http://www.febo.com/pages/soekris.* My clever use of a footnote probably hosed that link if you try clicking on it. Try: http://www.febo.com/pages/so

Re: [ntp:questions] PPS from an external OCXO source. Correcting drift is it possible?

2009-05-03 Thread John Ackermann N8UR
Kat said the following on 05/03/2009 12:05 AM: > Nero Imhard wrote: >> A much more reasonable approach would be to hook up the OCXO to > your >> computer's hardware clock for better stability. > Unfortunately not as easy as it seems high frequency clocks are > notoriously difficult to cons

Re: [ntp:questions] PPS from an external OCXO source. Correcting drift is it possible?

2009-05-03 Thread Hal Murray
In article , Kat writes: >To try and maintain better accuracy on the ntp server that feeds my >small network and increase the maxtime for server polling, I thought >that I would dig into my scrap box and build a PPS with a home built >OCXO as a spare time project. The NTP documentation stated t

Re: [ntp:questions] How bad is USB? (was: Re: Can the line audio out of HF radio be used to sync ntp. Trying to get a cheap ($) radio method.)

2009-05-03 Thread Hal Murray
>You've both commented that USB has drawbacks, but in reality what >performance might be obtained? Not everyone needs microsecond precision, >and USB might allow millisecond precision - i.e. possibly better than what >might be obtained by Internet access alone, or by using a radio source. > >Has a

Re: [ntp:questions] How bad is USB?

2009-05-03 Thread Hal Murray
>I'm in a third category (probably) - as long as my PCs "sound" to have the >same time, I'm happy. Actually, I want UTC as well, but as I have a >speaking clock working on two PCs it's "nice" when they both speak at the >same time. I wonder how close that needs to be - a few milliseconds, >pe