[time-nuts] Cheap 1588 cards Was: Re: Net4501

Bob Camp lists at rtty.us
Sat Jun 8 20:11:00 EDT 2013


Hi

Yes time stamping is pretty much a requirement for a 1588 card. The BIG question is weather the card will accept / generate a pps signal.

Bob

Sent from my iPhone

On Jun 7, 2013, at 9:52 PM, lists at lazygranch.com wrote:

> Well you sent me on a search. I know virtually zip about ptp, but this page lists a few ethernet cards that allow time stamping. Is this the same as having a 1588 card?
> 
> https://github.com/richardcochran/linuxptp-as/blob/master/README.org
> 
> -----Original Message-----
> From: Doug Calvert <dfc-list at douglasfcalvert.net>
> Sender: time-nuts-bounces at febo.com
> Date: Fri, 7 Jun 2013 20:58:20 
> To: Discussion of precise time and frequency measurement<time-nuts at febo.com>
> Reply-To: Discussion of precise time and frequency measurement
>    <time-nuts at febo.com>
> Subject: [time-nuts] Cheap 1588 cards Was: Re:  Net4501
> 
> On Thu, Jun 6, 2013 at 8:48 PM, Bob Camp <lists at rtty.us> wrote:
> 
>> 1588 compatible network cards are capable of time stamping everything
>> that goes in and out. They are pretty common these days both as stand
>> alone cards and as peripherals on MCU's. There's no real need to do
>> hardware, just come up with drivers (and all the other software goop)
>> to make them work with NTP. More or less the same work you would have
>> had to do once the FPGA was done and debugged.
>> 
>> Bob
> 
> 
> Can anyone recommend a cheap 1588 compatible card? I just recently saw
> that the linux kernel PPS support for the cards.
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