Electronics > Metrology

Cheap Chinese TZT-TS01 NTP Server

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bingo600:

--- Quote from: 5U4GB on October 04, 2024, 09:49:49 am ---Thanks for that!  The ones I've looked at are the cheaper model without the display, e.g. this one, which claims a WebUI interface and an accuracy of 0.5-2ms over a LAN.  Here's a screenshot of the web UI which is in English and shows DHCP capability (that is, it shows the current setting as static IP but it can be set to DHCP as well as per this review).  Has anyone played with one of these?

(Forestalling the inevitable comments, the linked review mentions that the settings are lost on power loss, but that's with much older firmware which has supposedly been fixed).

--- End quote ---

I ended up making a DIY STM32F407 based on ddrown's design here , and a LEA-M8T gps receiver
https://github.com/ddrown/ArchMax-NTPServer

Using this board
https://www.aliexpress.com/item/1005002760483449.html?

It required a few modifications to the sourcecode , as the above board is "stuffed" with "goodies" , taking up IO devices.
And ie. requiring you to move the GPS UART to another one than ddrown used, on his board.

It actually behaves very well, my Linux server often prefers the archmax over the DK National timeserver (expensive setup).
The reason the archmax sometimes "looses", is that currently my GPS antenna is on a 1'st floor south direction balcony. And heavy clouds + the lack of full view , can degrade the PPS a bit.


Btw: ddrown also have a Teensy 4.x based NTP Server , looking good too.

I have a Teensy 4.x but havent gotten around to that one yet, had to do the "EL Cheapo" first  ;D

Edit:
You have to keep the GPS serial speed at 115.200 , else the gps messages will fail an internal "integrity" arrival check
Don't ask me how i know ....


/Bingo

5U4GB:
I was lucky enough to get a Laureline NTP server when it was still available, that's been rock solid in operation for over a decade.  It's fully open-source for anyone else wanting to play with it.

Leo Bodnar:
What is the maximum load it supports?
Having had the experience of ntppool traffic I am always interested in maximum throughput of NTP servers.
If it's on the open Internet, sooner or later it will see a full wire speed wall of requests.
Leo

bingo600:

--- Quote from: Leo Bodnar on October 05, 2024, 12:56:29 pm ---What is the maximum load it supports?
Having had the experience of ntppool traffic I am always interested in maximum throughput of NTP servers.
If it's on the open Internet, sooner or later it will see a full wire speed wall of requests.
Leo

--- End quote ---

For the archmax (168MHz F407), I have absolutely no idea.
I just use it internally to sync my fwall & linux servers.
My use is 5..10 "home clients" ....
Most other stuff sync's to the fwall.

I would not put the archmax on the Inet though ...
The teensy 4.x NTP Server would be another ballpark, if one trusts the robustness of the "implementation".

I do have a Raspi4 Compute ... Waiting too.
That one is primarily for PTP, which the archmax supports too in HW.

At the moment I don't expect to serve/join any of them to a "pool" or public Inet.


I'm "warming up" to change the archmax MCU xtal with a 10MHz TCXO (reduced sinewave) ...
But i'm just a "hobbyist", so im not experienced w. "analog hw" ...

But now i might snag Laureline's implementation.

5U4GB:

--- Quote from: bingo600 on October 07, 2024, 02:46:34 pm ---But now i might snag Laureline's implementation.

--- End quote ---

Also check out the PCB layout, he's got the TCXO on a small "island" on the PCB to minimise thermal bridging from other components, it's quite well done.

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