Time Synchronization
Requriements
- 1x GPS receiver module with PPS output
- 1x GPS antenna and cabeling (optional)
Setup
For accurate network latency measurements the Raspberry Pi clock can be sychronized via GPS. For this purpose a dedicated GPS receiver module with a dedicated pulse-per-second (PPS) output is required.
Connect the GPS receiver according to the following table:
| Pin GPS Module | Raspberry Pi P1 Header | BCM | Direction |
|---|---|---|---|
| GND | 6 (GND) | ||
| 3.3V | 1 (+3V3) | ||
| RX | 8 | GPIO 14 / TXD0 | RPi -> GPS |
| TX | 10 | GPIO 15 / RXD0 | GPS -> RPi |
| PPS | 12 | GPIO 18 | GPS -> RPi |
Configuration
info
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Configuring Linux PPS device on Raspberry Pi
The configuration of the PPS inputs on a Raspberry Pi is done by the RIasC Ansible playbook. It will be applied to all Raspberry Pi based nodes.