La web impulsada des de la #PTP, i amb un manifest i amb adhesions per a entitats.

https://sensetrensnohihafutur.com/

#transportpúblic #manifestació7f

Introducing Pixie; yet another GNSS disciplined Raspberry Pi timeserver setup. There are a number of low-level tweaks including a realtime kernel build, per-CPU process isolation, PTP grandmaster time support, and NTP server support. Check out the wiki for more details!
https://github.com/josh-blake/pixie #gnss #raspberrypi #rpi5 #embedded #timeserver #ptp #ntp

TIL: Besides UTC, there also is TAI – Temps Atomics International aka International Atomic Time. And well … TAI currently is UTC +37s 🤯

For other interesting things about time, computer time and time protocols, I highly recommend the talk on PTP from last years #39C3: https://media.ccc.de/v/39c3-excuse-me-what-precise-time-is-it #ptp #ntp #timeprotocol

🚂🤖 Eurostar's #AI #chatbot decided to take a scenic route #off the track, proving once and for all that even machines can have "off #days." 😂 But fear not! #PTP is here to save the day with enough acronyms to make your head spin faster than a runaway #train. 🚀🔤
https://www.pentestpartners.com/security-blog/eurostar-ai-vulnerability-when-a-chatbot-goes-off-the-rails/ #Eurostar #humor #technology #machinelearning #HackerNews #ngated

Nur die Richtigkeit der Zeit bringt die Richtigkeit der Realität. Für eine Annäherung dessen bin ich immer zu haben.

Auf dem #39c3 wurde #PTP zur Synchronisation der Video Aufzeichnungen genutzt. #NTP mit mehreren ms Abweichung ist spürbar. Aber im Q&A Teil zweifel ich an, dass unser Gehör und Gehirn im ns Bereich arbeitet. µs Genauigkeit denke ich hier wäre richtig.

Und ab ins Rabbit Hole und zig Webseiten mit abweichender genauer Richtigkeit.

https://media.ccc.de/v/39c3-excuse-me-what-precise-time-is-it

Clock Synchronization: A rundown of different algorithms and systems for keeping computers in sync
https://arpitbhayani.me/blogs/clock-sync-nightmare/
#synchronization #via:hackernews #clocks #time #ntp #ptp #+

Clock Synchronization Is a Nightmare

#ntp #ptp #sync #time #unix

https://arpitbhayani.me/blogs/clock-sync-nightmare/

Shower rain on Pointe-à-Pitre Le Raizet airport (Guadeloupe) “TFFR 191430Z AUTO 07009KT 040V110 9999 FEW028 29/23 Q1016 TEMPO 3000 SHRA FEW015CB BKN020TCU” : See what it means on https://www.bigorre.org/aero/meteo/tffr/en #pointeapitreleraizetairport #airport #pointeapitre #guadeloupe #tffr #ptp #metar #aviation #aviationweather #avgeek vl

Seguim perdent patrimoni ferroviari històric!

https://transportpublic.org/sagrera-edifici-mercaderies-preservacio/

#transportpúblic #ptp #adif #renfe #sagrera

Nooooooo, #PTP is offline 😳

Shower rain on Pointe-à-Pitre Le Raizet airport (Guadeloupe) “TFFR 201200Z AUTO 10009KT 9999 FEW050/// ///CB 28/24 Q1015 TEMPO 12015G25KT 3000 SHRA” : See what it means on https://www.bigorre.org/aero/meteo/tffr/en #pointeapitre #guadeloupe #pointeapitreleraizetairport #tffr #ptp #metar #aviation #aviationweather #avgeek #airport vl

Pointe-à-Pitre Le Raizet International Airport - Pointe-à-Pitre, Guadeloupe

https://en.wikipedia.org/wiki/Pointe-%C3%A0-Pitre_International_Airport
https://www.openstreetmap.org/#map=13/16.265301/-61.531799

#TFFR #PTP #PointeàPitre #Guadeloupe #airport #aviation #avgeeks #GIS

Von kompliziert zu simpel: PTP-Synchronisation mit Timemaster statt ptp4l

Timemaster macht die PTP-Synchronisation unter Linux endlich einfach. Statt mühsam ptp4l und phc2sys zu konfigurieren, reicht eine zentrale Datei – und schon werden PTP- und NTP-Quellen automatisch eingebunden.

#chrony #HighPrecisionTime #linux #Netzwerkzeit #ntp #phc2sys #PrecisionTimeProtocol #ptp #ptp4l #systemd #Timemaster #zeitserver #Zeitsynchronisation

https://dirkwouters.de/von-kompliziert-zu-simpel-ptp-synchronisation-mit-timemaster-statt-ptp4l/

Jami

https://loma.ml/display/373ebf56-6468-d59f-121e-3c3139343840

🇺🇦 #NowPlaying on #BBC6Music's #LaurenLaverne

PTP:
🎵 Rubber Glove Seduction

#PTP

https://ministryband.bandcamp.com/track/rubber-glove-seduction-1989

https://open.spotify.com/track/521q7RBO7Lb9V54F7yPF6K

Pointe-à-Pitre Le Raizet International Airport - Pointe-à-Pitre, Guadeloupe

https://en.wikipedia.org/wiki/Pointe-%C3%A0-Pitre_International_Airport
https://www.openstreetmap.org/#map=13/16.265301/-61.531799

#TFFR #PTP #PointeàPitre #Guadeloupe #airport #aviation #avgeeks #GIS

Sub-millisecond time: Detailed experiments of trying to push the limits of time synchronization on Linux on commodity hardware. <1ms is easy, 20-60ns may be a practical limit
https://scottstuff.net/posts/2025/06/10/timing-conclusions/
#synchronization #linux #time #ntp #ptp #+

Perfect timing! ⏰ Asterfusion's latest blog is a game-changer for anyone in broadcast, media, or 5G.
We're talking nanosecond-perfect timing with SONiC-based PTP switches! ⏱️
This guide breaks down everything you need to know about deploying Precision Time Protocol (PTP) to achieve unparalleled clock synchronization. It's a massive leap from the millisecond precision of traditional NTP.

Our SONiC-based PTP switches are perfect for:
Seamless A/V alignment in broadcast 📺
Coordinating radio units in 5G & O-RAN networks 📶
Ready to achieve perfect timing? See how Asterfusion is making it happen!

🔗 https://cloudswit.ch/blogs/how-to-deploy-ptp-network-switches-with-sonic/

#PTP #SONiC #NetworkSwitch #Timing #Synchronization #5G #Broadcast #O-RAN #Asterfusion #PrecisionTimeProtocol
https://cloudswit.ch/blogs/how-to-deploy-ptp-network-switches-with-sonic/

Okay, it's time for the big #ntp and #ptp wrap-up post. My week-long timing project spiraled out of control and turned into a two month monster, complete with 7 (ish?) GPS timing devices, 14 different test NICs, and a dozen different test systems.

What'd I learn along the way? See https://scottstuff.net/posts/2025/06/10/timing-conclusions/ for the full list (and links to measurements and experimental results), but the top few are:

1. It's *absolutely* possible to get single-digit nanosecond time syncing with NTP between a pair of Linux systems with Chrony in a carefully-constructed test environment. Outside of a lab, 100-500 ns is probably more reasonable with NTP on a real network, and even that requires carefully selected NICs. But single-digit nanoseconds *are* possible. NTP isn't just for millisecond-scale time syncing.
2. Generally, PTP on the same hardware shows similar performance to NTP in a lab setting, with a bit less jitter. I'd expect it to scale *much* better in a real network, though. However, PTP mostly requires higher-end hardware (especially switches) and a bit more engineering work. Plus many older NICs just aren't very good at PTP (especially ConnectX-3s).
3. Intel's NICs, *especially* the E810 and to a lesser extent the i210 are very good at time accuracy. Unfortunately their X710 isn't as good, and the i226 is mixed. Mellanox is less accurate in my tests, with 200ns of skew, but still far better than Realtek and other consumer NICs.
4. GPS receivers aren't really *that* accurate. Even good receivers "wander" around 5-30 ns from second to second.
5. Antennas are critical. The cheap, flat window ones aren't a good choice for timing work. (Also, they're not actually supposed to be used in windows, they generally want a ground plane).
6. Your network probably has more paths with asymmetrical timing in it than you'd have expected. ECMP, LACP, and 2.5G/5G/10Gbase-T probably all negatively impact your ability to get extremely accurate time.

Anyway, it's been a fun journey. I had a good #time.