[time-nuts] nortel trible NTBW50AA boards SCPI command access

[Bob Camp]

Hi

Some of the similar boards have *lots* of 0.5 Hz coming out on differential pairs. I suspect that the easy approach for NTP would be to hack the driver.

Bob

On Sep 13, 2013, at 5:20 PM, Mark C. Stephens <marks at non-stop.com.au> wrote:

> Typo - 0.5Hz, coming out of a 74AC74 driven by PAL.
> Split off to front connector and "cellular interface" so there is 2 places to pick of 0.5Hz.
> 
> 
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On Behalf Of Iain Young
> Sent: Saturday, 14 September 2013 5:12 AM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] nortel trible NTBW50AA boards SCPI command access
> 
> Hi Mark
> 
> On 13/09/13 13:26, Mark C. Stephens wrote:
> 
>> One obvious use for the SCPI port could be for NTPD.
>> The NTBW50AA is lacking 1PPS but has a very accurate 2 Hz pulse ideal for NTPD.
> 
> 2Hz ? I thought it they were a pulse on the even second, thus actually
> 0.5 Hz ?
> 
> I wonder how the PPS Driver in NTP would react to that (either 2Hz, or 0.5Hz pulses). I guess if it really is 2Hz, then one of Tom's PICs could be used to drop it to 1 Hz
> 
> But if it's 0.5 Hz, I wonder if a modification to the ATOM driver or underlying PPS code would be needed
> 
> Or is the 2Hz signal coming off the SCPI port ?
> 
> 
> Iain (and yes, like others, I am interested)
> 
> 
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