Which is the POS port?

I read the juniper-interface pos, there seems have no introduce of it.

I have a Juniper-EX4200 interfaces picture:

The front: The front

The back: enter image description here

There I do not find a interface named POS port, so, who can explain for me?

  • I really doubt an ethernet switch can do SONET.
    – Teun Vink
    Jul 31, 2018 at 14:39
  • the manual has the POS port configuration. Aug 1, 2018 at 4:45
  • which manual would that be? I can understand if the JunOS manual has it (since some of the other platforms do support SONET), I really doubt the EX series (which is positioned as a datacenter switch) supports this, I don't see SONET, SDH or POS mentioned in the datasheet: juniper.net/assets/us/en/local/pdf/datasheets/1000215-en.pdf
    – Teun Vink
    Aug 1, 2018 at 4:55
  • I think should have a optical fiber convertor. Aug 1, 2018 at 6:13
  • That has nothing to do with POS. The 'network ports' on the front can have fiber ports (SFP), depending on the exact model of EX4200 you have, as you can see on juniper.net/documentation/en_US/release-independent/junos/…
    – Teun Vink
    Aug 1, 2018 at 6:18

1 Answer 1


posis a packet over SONET interface.

In the picture that you are attaching there is not a SONET interface, they look like this:

enter image description here

It's a fiber optics interface able to use SONET as signaling and pos is a definition that permits to transport packets over SONET.

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