I found these devices that do what you want, but they look fancy and expensive, I'm guessing that you wish to get around the latter.
https://www.engageinc.com/products/tdm/prima-stratum-gps-stratum-1-clock.html https://www.endruntechnologies.com/gps-frequency-standard.htm On Thu, Feb 22, 2018 at 5:29 PM, <ch...@wbmfg.com> wrote: > The problem is there is a crap ton of stuff out there that needs network > sync. And it all has a T1 as an input. > But most T1 trunking circuits are getting replaced with SIP. > > So, I am building a cheap and dirty T1 signal generator that is GPS and > rhubidium referenced. The hard part is easy. The easy part should be easy > but all the T1 framing chips that used to exist no longer exist. > > The ones that are out there have massive CPU interfaces and tons of > registers that need to get set to get them fired up and running.... > > Where is Exar when you need them.... > > *From:* Adam Moffett > *Sent:* Thursday, February 22, 2018 4:21 PM > *To:* af@afmug.com > *Subject:* Re: [AFMUG] OT Raspberry PI > > Tell whoever's got the T1 that 1967 is way behind us and get a new > interface. > Problem eliminated LOL > > > ------ Original Message ------ > From: ch...@wbmfg.com > To: af@afmug.com > Sent: 2/22/2018 6:16:45 PM > Subject: Re: [AFMUG] OT Raspberry PI > > > I have to generate an alternate mark inversion signal on 1.544 MHz with > every 193rd bit following a t1 framing sequence. > Sure wish a 555 could do that. > > *From:* Dave > *Sent:* Thursday, February 22, 2018 4:10 PM > *To:* af@afmug.com > *Subject:* Re: [AFMUG] OT Raspberry PI > > Find a 555 timer ... I used many in the olden day when radioshacks were > king LOL! > > > On 02/22/2018 05:05 PM, ch...@wbmfg.com wrote: > > I am thinking of using some shift registers instead of using the PI output > directly as the timing signal. > > Use the PI to load them. > > I love me some hardware design anyhow.... > > > *From:* Colin Stanners > *Sent:* Thursday, February 22, 2018 3:59 PM > *To:* af@afmug.com > *Subject:* Re: [AFMUG] OT Raspberry PI > > Other than setting the process priority, you may need a custom kernel. See > https://medium.com/@metebalci/latency-of-raspberry-pi-3-on- > standard-and-real-time-linux-4-9-kernel-2d9c20704495 > > > On Feb 22, 2018 4:48 PM, <ch...@wbmfg.com> wrote: > >> Anyone know how to get my program to run on bare metal? >> >> Or at the very least tell Linux that my program is the most important >> thing in the world and service it above all other things. >> >> I am trying to create a timing signal with the Pi. It is doing it but >> the jitter is pretty bad. >> >> I have researched trying to use an interrupt but there is a pretty low >> limit on how many times per second you can fire a hardware interrupt. >> Too low for my application. >> > > -- > >
