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beaglebone-gps-clock | magma | |
---|---|---|
3 | 8 | |
27 | 1,653 | |
- | 1.1% | |
0.0 | 7.8 | |
about 1 year ago | 5 days ago | |
Go | C++ | |
- | GNU General Public License v3.0 or later |
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
beaglebone-gps-clock
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Raspberry Pi Nixie Atomic Clock
This is a great project! I was expecting a run-of-the-mill GPSDO, but this is way better.
I've been looking for more time sources to add to my own GPS clock: https://github.com/jrockway/beaglebone-gps-clock (which is one of those boring ones that everyone has).
I have been thinking about buying a rubidium oscillator from eBay for fun, but basically anticipated the problem the author had -- they have been mistreated for years before finally landing on eBay, and aren't any good. GPS is my only frequency reference, so I wouldn't really be able to fix it; I'm at the mercy of my very obstructed view of the sky.
I'd like to be able to measure how badly out of sync I get when I fall down from 16 satellites to 4 satellite throughout the day. I can sort of intuit that from the data I get right now (I send "chronyc sourcestats" to influxdb every 30 seconds, and you can see that when the GPS signal gets bad, the frequency error in my system clock also gets bad.), but I'd like to measure it conclusively. Will probably spend a bunch of money on the problem and become even more unsure which way is up ;)
The link to the "time to digital converter": https://www.ti.com/lit/ds/symlink/tdc7200.pdf is very interesting, and I totally forgot that I should be measuring AC powerline cycles to see how they're doing relative to GPS.
(In the past, I also incorporated a WWVB receiver, but get such a terrible signal in New York that I didn't get any usable data out of it. I then dropped the ceramic antenna and that was the end of that project. I have since realized that I can buy a phase-modulation receiver inside of a clock, throw away the clock, and try that, however. Ordering one right now, actually! Thanks HN!)
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The Raspberry Pi as a Stratum-1 NTP Server
I made one as well (with a Beaglebone) and also have notes:
https://github.com/jrockway/beaglebone-gps-clock
My guide is also quite out of date, but I did rebuild it from scratch a couple years ago by following my own instructions and they worked ;)
Some discussion on HN this morning: https://news.ycombinator.com/item?id=28141493
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Facebook open-sourcing a more precise time server
What's interesting to me is how the form factor of timing GPS modules has stayed constant over the years. I started my GNSS timing journey with a used Trimble GPS from the 2000s, and it has the same form factor and pinout as the modern multi-constellation timing GPSes from uBlox.
I've had a GPS clock going for several years at this point, and without an atomic clock or really any fanciness (just LinuxPPS and Chrony), I see about +/- 380ns, which is pretty good. NTP to the Internet gives me jitter in the range of about 20ms-70ms, about 5 orders of magnitude worse.
(The version a few iterations ago looked like this: https://github.com/jrockway/beaglebone-gps-clock. But I now have a uBlox multi-constellation GPS, which is much more accurate with my limited view of the sky from my Brooklyn apartment. And I 3D printed the case, so it actually looks presentable instead of like some crazed madman that attacked a plastic case with a hacksaw -- which is exactly how I made the first case. As for the DS3231 RTC that I added... that seems to be stable within about 1.5us, which is pretty impressive. I tuned it a little bit with the trim register, though.)
magma
- Scaling Rust Builds with Bazel
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Building Flexible, Low-Cost Wireless Access Networks with Magma
I recommend to have a quick look at https://github.com/magma/magma#readme first to get a quick overview of what Magma is, before going into the details.
- Is there any technical limitation preventing existing miners upgrading to 5G?
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Cisco virtualised packet core
There are also open source software stacks, such as Magma https://www.magmacore.org/
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AWS Private 5G- 5G As a Service
Are they using Magma[1]? I couldn't tell from their sparse FAQ[2]. The Magma community is strong and they're making great progress on the open standard.
1 Magma - Facebook built 5G hotspot platform: https://www.magmacore.org/
2 AWS FAQ - https://aws.amazon.com/private5g/faqs/
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CEO Mark Zuckerberg responds to the massive Facebook document dump
uhhhh I realize hating Facebook is cool, but Facebook is just a contributor to Magma which is open source platform with many partners: https://github.com/magma/magma
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Facebook open-sourcing a more precise time server
PTP is required in a number of 5G implementations. Facebook's 5G core (Magma - https://github.com/magma/magma) utilizes it quite a bit.
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Gopher Gold #20 - Wed Nov 18 2020
magma/magma (Go): Platform for building access networks and modular network services
What are some alternatives?
txtempus - A DCF77, WWVB, JJY and MSF clock LF-band signal transmitter using the Raspberry Pi
free5gc - Open source 5G core network base on 3GPP R15
Time-Appliance-Project - Develop an end-to-end hypothetical reference model, network architectures, performance objectives and the methods to distribute, operate, monitor time synchronization within data center and much more...
Purpur - Purpur is a drop-in replacement for Paper servers designed for configurability, and new fun and exciting gameplay features.
moonfire-nvr - Moonfire NVR, a security camera network video recorder
Paper - The most widely used, high performance Minecraft server that aims to fix gameplay and mechanics inconsistencies
Flicks - A unit of time defined in C++.
CatServer - 高性能和高兼容性的1.12.2/1.16.5/1.18.2版本Forge+Bukkit+Spigot服务端 (A high performance and high compatibility 1.12.2/1.16.5/1.18.2 version Forge+Bukkit+Spigot server)
onload - OpenOnload high performance user-level network stack
open5gs - Open5GS is a C-language Open Source implementation for 5G Core and EPC, i.e. the core network of LTE/NR network (Release-17)
GNSSTimeServer - WiFi-enabled GNSS (GPS, BeiDou, GLONASS, Galileo) fed NTP/RDATE server based on ESP8266/ESP32 and Arduino
AdGuardHome - Network-wide ads & trackers blocking DNS server