FWIW Sparkfun has a ZED-F9T board available but at $300 it's not cheap.
https://www.sparkfun.com/products/18774

Bob Darby

Date: Sat, 12 Mar 2022 11:50:53 -0500
From: Bob kb8tq kb8tq@n1k.org
Subject: [time-nuts] Re: Looking for a new GNSS-receiver for a
diciplined oscillator - Which one to buy?
To: Discussion of precise time and frequency measurement
time-nuts@lists.febo.com
Cc: Ulf Kylenfall ulf_r_k@yahoo.com
Message-ID: 1D406438-8517-43DA-AF8C-2984ECE2FCDD@n1k.org
Content-Type: text/plain;      charset=us-ascii

Hi

Finding anything in stock these days can be exciting.

There do seem to be uBlox M8T based boards in stock. An F9T board would be more fun, but does not seem to be very easy to find. They do have F9T modules in stock. That would mean doing up some sort of PCB to mount it on.

Bob

How about the OCP time card?
There should be a few suppliers today.

If you need a NIC and a GNSS receiver in one look at NVIDIA’s
https://www.opencompute.org/products/441/nvidia-connectx-6-dx-dual-port-100gbe-nic-and-time-card

Thanks,
Elad

From: Bob Darby bob@them-int.com
Sent: Monday, March 14, 2022 9:55 AM
To: time-nuts@lists.febo.com time-nuts@lists.febo.com
Subject: [time-nuts] Looking for a new GNSS-receiver for a disciplined oscillator - Which one to buy?

FWIW Sparkfun has a ZED-F9T board available but at $300 it's not cheap.
https://www.sparkfun.com/products/18774

Bob Darby

Date: Sat, 12 Mar 2022 11:50:53 -0500
From: Bob kb8tq kb8tq@n1k.org
Subject: [time-nuts] Re: Looking for a new GNSS-receiver for a
diciplined oscillator - Which one to buy?
To: Discussion of precise time and frequency measurement
time-nuts@lists.febo.com
Cc: Ulf Kylenfall ulf_r_k@yahoo.com
Message-ID: 1D406438-8517-43DA-AF8C-2984ECE2FCDD@n1k.org
Content-Type: text/plain;      charset=us-ascii

Hi

Finding anything in stock these days can be exciting.

There do seem to be uBlox M8T based boards in stock. An F9T board would be more fun, but does not seem to be very easy to find. They do have F9T modules in stock. That would mean doing up some sort of PCB to mount it on.

Bob

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Hello,

On Mon, Mar 14, 2022 at 05:59:58PM +0000, Elad Wind wrote:

I couldn't find any, as of now.

https://github.com/opencomputeproject/Time-Appliance-Project/tree/master/Time-Card

still reads:

'However, we are currently working with several suppliers and will have
their contact info soon available to allow you to purchase an
out-of-the-box ready Time Card.'

FWIW, the MCX623106GN-CDAT Nvida card is already marked as legacy and EOL:
https://docs.nvidia.com/networking/display/ConnectX6DxEN

The MCX623106GC-CDAT might be a similar successor (100 GBE with PPS
In/Out, Enhanced-SyncE & PTP GM support and GNSS, PCIe 4.0 x16), but I
don't even find a dedicated product page for it - let a lone a shop
listing.

Certainly, it doesn't look cheap.

Better availabilty should have the Cisco Nexus NIC GM (the GM formerly
known as Exablaze ExaNIC GM), which can be ordered with an OCXO or CSAC:

https://exablaze.com/docs/exanic/user-guide/exanic-gm/
https://www.cisco.com/c/en/us/products/collateral/interfaces-modules/nexus-smartnic/datasheet-c78-743824.pdf

Also not cheap, especially after the Cisco acquisition.

Intel also lists a NIC with GPS onboard option, but it's pretty new,
i.e. probably still at the sample/pre-order stage.

Best regards,
Georg

--
'[..] they shall speak with new tongues; They shall take up
serpents; and if they drink any deadly thing, it shall not hurt
them; [..]' Mark 16:17-18  ;)

Hello,

for the record, some additional information:

On Sat, Apr 16, 2022 at 12:10:19PM +0200, Georg Sauthoff wrote:
[..]

Not a dedicated product page, but Nvidia has a manual on configuring
ts2phc, ptp4l etc. for these NICs:

https://docs.nvidia.com/networking/display/NVIDIA5TTechnologyUserManualv10/PHC%20Synchronization%20with%20Onboard%20GNSS

The manual also specifies the specific GNSS receiver that is used on
these NICs: UBLOX UBX-m8030

cf. https://docs.nvidia.com/networking/display/NVIDIA5TTechnologyUserManualv10/On+Board+GNSS+Receiver

[..]

It's a variant of the Intel E810-XXVDA4T NIC:
https://www.intel.com/content/www/us/en/products/sku/211608/intel-ethernet-network-adapter-e810xxvda4t/specifications.html

To be precise, the variant with onboard GNSS receiver is the
E810XXVDA4TGG1 (cf. the Product Brief,
https://cdrdv2.intel.com/v1/dl/getContent/641626).

Some details regarding time syncronisation features (also from the
product brief):

'Onboard high-precision oscillator maintains high
accuracy during holdover (when the synchronization
source is not available), providing up to four hours with
less than +/- 1.5 microsecond of phase error.

Optional GNSS mezzanine enables integrated
support for frequency, phase, and time-of-day
synchronization with Global Navigation Satellite
Systems, including GPS, Galileo, GLONASS, BeiDou,
and QZSS. Available on E810XXVDA4TGG1 only.
Subminiature version B (SMB) coaxial connector allows
connection to an external active GNSS antenna.

Dual external SubMiniature version A (SMA) coaxial
connectors allow connection to external 1PPS timing
sources, such as GNSS signaling, devices and to
timing recipients, enabling the network adapter to act as
a grandmaster and as a timing source for other
equipment. The output capability provides a way to
audit the phase accuracy of each node.

U.FL connectors, embedded coaxial connectors,
allow 1PPS signal connectivity between the adapter and
motherboard or another adapter. Dedicated send and
receive U.FL ports are embedded on the adapter.'

The product brief doesn't name the used GNSS receiver, perhaps Intel
wants to stay flexible and doesn't want to commit to a certain
vendor/module.

FWIW, both the Nvidia and Intel NICs also support SyncE for frequency
synchronisation.

Best regards,
Georg

--
'The medium is the message'
(Marshall McLuhan. Understanding Media: The Extensions of Man. 1964)