I'm a new member to this community.

I've just started to learn and practice on working with LAN Ethernet PHYs, Switches and other ICs related to Ethernet.

However, I've a few questions where I couldn't understand some terms.

Can someone please explain me on what the terms mean:

"Managed Ethernet Switch" - What is being managed?

"Switch Fabric"

"Virtual PHY"

"Peer to Peer transparent clocks"

I was going through the datasheet of this - IC

Please do help. Thank you.

1 Answer 1

  • A managed Ethernet switch provides some kinds of management and configuration - e.g. bandwidth measurement, error counters, SNMP, VLAN and port configuration. See [1] for more.
  • A switch fabric is a concept for building hardware switches - it alludes to the basic property that each port can talk to any other (idle) port at the same time. You can visualize that as a fabric of connections inside the switch (although it's not usually implemented like that).
  • The virtual PHY is described in the text (an actually PHY-less connection to the host, using an MII).
  • Transparent clocks refers to PTP/IEEE 1588 synchronized clocks.
  • Could you please provide some more explanation on the 3 point of Virtual PHY? What is the advantage?
    – Newbie
    May 16, 2022 at 14:01
  • A direct MII-to-MII connection skips the two PHYs in between for backplane-type connections. It's just a bit less hardware for the same functionality.
    – Zac67
    May 16, 2022 at 14:08

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.