Stack Exchange Network

Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [ptp]

Precision Time Protocol is used to synchronize clocks with sub-microsecond accuracy.

1
vote
0answers
21 views

Network cards supporting PTP one-step-sync

We currently want to setup a PTP Grandmaster using ptp4linux on a Linux host. The slave devices rely on PTP one-step-sync but we haven't found any purchaseable network card on the marked which has ...
0
votes
0answers
27 views

PTP causes periodic time jumps

I have GigEVision cameras where I like to synchronize the cameras' internal clocks with a Ubuntu 16.04.5 host via PTP. Unfortunately, as soon as I enable the PTP synchronization, I get periodic jumps ...
0
votes
1answer
138 views

Packets difference between PTP and gPTP

I'm trying to understand few things about gPTP (IEEE 802.1AS). I am using the open source implementation by AVnu (https://github.com/AVnu/gptp). I looking on the packets using Wireshark, and they ...
0
votes
0answers
12 views

What is the difference between logical syntonization and physical syntonization in 802.1AS?

I think that. syntonization: align frequency. logical syntonization: I know about the neighbor frequency with timestamp message. so I can calculate accurate time relative to the neighbor. not directly ...
0
votes
0answers
32 views

ptp ptpd - How can I check if device is synchronized with master?

I have ptp daemon on linux machine, it works as a slave. Is there any ptp command/tool etc. which can tell me if my machine is already synchronized with the master (and preferably time offset)?
3
votes
1answer
249 views

Is PTP really more precise than NTP? If so, why?

I have read quite a bit about NTP and PTP time keeping protocols. While many sources claim that PTP is more precise than NTP for that type of granularity - the reason is not as clear. Why can't NTP be ...
0
votes
0answers
664 views

Use of PTPd on RedHat/CentOS

I need to create a reliable and accurate synchronization between two CentOS 6 machines connected through a direct Ethernet connection. I've seen that on Linux several implementation of the IEEE 1588 ...
1
vote
2answers
408 views

PTP (or NTP) and Domain Controller clock sync

We need a high precision (1ms) clock synchronization across multiple machines which are part of the domain. The idea is to use a PTP solution. Is it possible to setup a computer which is part of the ...
1
vote
0answers
320 views

How to configure a redundant PTP server

I have a Sonoma GPS time server and a server, which should synchronise itself to the GPS clock, and serve as a fallback option. The time should be synchronised using PTP (Precision-Time-Protocol). ...
1
vote
1answer
6k views

ptp time synchronization on centos6/rhel

I need to setup time synchronization using PTP (precision time protocol). I'll get server address. I found ptpd server (version 2.1). I created startup files in /etc/init.d. But wondering what options ...
3
votes
2answers
2k views

Why PTP uses Sync-followup pairs?

The PTP (Precision Time Protocol), uses Sync message then Follow-up message, as described in the article "Understanding the IEEE 1588 Precision Time Protocol". I don't understand why do we need ...