title: Are the 4 Rx channels, organized by two B210s, synchronous?
body: <p>I would like to develop my question posted here:
  <a href="https://stackoverflow.com/questions/67901328/how-to-setup-two-usrps-b210-in-gnu-radio">How to setup two USRPs B210 in GNU Radio</a>.
  Based on comment, now I have following flowgraph:
  <a href="https://i.stack.imgur.com/uLR4p.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/uLR4p.png" alt="enter image description here" /></a>
  I have two B210s, that share common clock and PPS via external Octoclock.
  The two channels of each B210 are synchronous.
  What is relationship of channels of different B210s?
  Could I assume synchronism between them too?</p>