Information

The following applies to devices operating as PTP Leaders in a Q-SYS PTP domain.

A PTP Leader is responsible for sending Sync and Follow Up messages to provide timing to the domain, as well as responding to Delay Request messages from PTP Follower devices.

This also applies to a device acting as a Boundary Clock, such as a switch operating in PTP BC mode.

What is a PTP Profile?

The purpose of a PTP profile is to allow organizations to specify specific selections of attribute values and optional features of PTP that, when using the same transport protocol, inter-work and achieve a performance that meets the requirements of a particular application.

What PTP Profile attributes does Q-SYS require?

PTP compatibility with Q-SYS is not about the specific profile, but more importantly the attributes it applies.

Q-SYS devices require a Sync Interval of -3 (8pps, 125ms) to maintain stable audio and video synchronization.

If the switch includes an AES67 Media Profile, it will use this Sync Interval and will be a suitable choice.

If using the Default Profile of a the switch, the Sync Interval will likely need to be changed from the default (typically 0) to -3. If the device you are using does not allow direct customization of the Sync Interval, this will not be suitable as using a slower Sync Interval may result in a wildly fluctuating clock offset issues.