How can I test the connection quality between MoCA nodes?

You can check the MoCA link rate through the ECB WEB GUI. 

You can also evaluate it as follows:  

1. Run a network speed test (e.g., speedtest.net) on a device connected to the MoCA unit to measure upload/download speeds.  
2. Check if the MoCA light blinks green steadily, indicating normal data transfer.
3. Use a ping command (e.g., ping [router IP] -t) on a computer to check latency and packet loss.