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

[Mark C. Stephens]

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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