Not sure on where to get one, check out the link below
Timecard Mini Ecosystem Guides
Key concepts of the Timecard Mini ecosystem
The Open Timecard mini ecosystem is a collection of Raspberry Pi CM4 / CM5 compatible modules that fit the same form factor and 200-pin connector integration.
This allows all our modules to work with compatible Raspberry Pi CM4 / CM5 (or clone) IO Board.
The Open Timecard mini can distribute PTP, NTP, SyncE, Frequency, and some positioning benefits.
The Modules:
Precision Timing (PT)
Precision Timing Lite
Precise Positioning
Essentials
The brains of the operation are the CM4 or CM5, typically in conjunction with a Timebeat mini PCie baseboard.
Below are some helpful defaults when using a Timebeat Raspberry Pi or Raspberry Pi image.
IP address is: 10.101.101.99
Username: admin
Password: 1234
Config location: /etc/timebeat/timebeat.yml
OS: Linux
External Interface ID: eth0