What do the numbers mean?

Quick answer

The Link card shows how healthy the connection is, with a one-line verdict. Tap any number (hover on the Mac) to see what it means.

Get help on any number

Verdict line: green Link healthy. or an orange warning.
Round-trip: time to the other end and back. Set latency to 3–4× this.
Receive rate / Send rate: data moving now.
Loss, last second: packets that did not arrive.
Dropped: packets that came too late. These cause glitches.
Buffer: video waiting in the latency buffer. Near zero means drops are coming.
Undecrypted: more than zero means the passphrases do not match.
Link bandwidth: what the network path can carry. Keep the bitrate well under it.
Orange numbers need a look.

Video: codec, Profile / level, Resolution, Frame rate, Scan, bitrate, Keyframe every.
Captions: CEA-608 and CEA-708 say Seen or None seen.
Audio: codec, Language, Channels, Sample rate, bitrate.
Transport: packet counts and errors such as Continuity errors and PCR jitter.