Do Clear-Com IPT transceivers work with PTP Sync interval of -2 setting

 

I am using a PTP-aware Ethernet switch that has a fixed PTP sync internal setting of -2, will this work for the IPTs

 

Answer:

The IPT could lock with a sync interval of -2 (250 ms) but chances are PTP will be less stable than with the sync interval set to -3 (125ms). We have seen IPTs work when connected to a boundary clock switches and having them be the grand master on the PTP clock.

 

Why isn’t this a recommended setting?

Well, the PTP transceivers clock will have a lot more jitter and the possibility of the clocks exceeding the clock tolerance we have is a lot higher here (to enable smooth RF roaming and dect sync). Adjusting the clock 4 times per second instead of 8 times per second means the drift between adjustment will be higher which means the correction applied will be higher which leads to higher jitter.

 

So, depending on the network topology and network characteristics, this might just work. But, we generally do not recommend it.

 

The E-IPA card has two available PTP profiles, AES67 and SMPTE 2110 (ST 2059-2).

These default values, shown in the table below can be adjusted as appropriate. However, in most cases you will use the standard PTP values defined by the profiles.

When using a IPA card in PTP follower mode. Please ensure the E-IPA card settings MATCH the media profile and PTP settings of the PTP GM leader

Also ensure all Eth-switches in Boundary clock mode, MATCH the media profile and PTP settings being used on the GM PTP leader