New answers tagged

3 votes
Accepted

Why do my boards shut off when I connect an RJ45 cable to a switch but not a router?

The error is that there are no magnetics and your device passes 3.3V supply through the cable and other device. Plugging it to another device will short 3.3V to GND through the cable, depending on how ...
Justme's user avatar
  • 144k
2 votes

Why didn't 10GBASE-T Ethernet replace 1000BASE-T?

I'm guessing because it does not have a broad use (yet). 10GBASE-T might be useful for server rooms or other high-performance applications, but for those there are other, even better alternatives (...
PMF's user avatar
  • 627
1 vote
Accepted

Ethernet with incorrect pinout still makes link?

The connection is not obvious, but as the pair used for pins 3&6 share a path between two transfoŕmer center taps via two 75 ohm resistors, there must be good enough signal for the link to work.
Justme's user avatar
  • 144k
2 votes

Self clock synchronization in NRZ-I encoding

Take a byte, or kilobyte, full of zeroes, and send it using NRZ-I. That is 8192 bits of constant logic level. In order for your receiver to be able to determine that there was 8192 bits instead of ...
Justme's user avatar
  • 144k
1 vote

Clock synchronization in ethernet PHY

Depends on which Ethernet you are talking about. The 10 Mbps versions (10Base5, 10Base2, and 10BaseT) alredy did that, by using Manchester encoding. To send 10 Mbps of payload data, the Manchester ...
Justme's user avatar
  • 144k
1 vote

Clock synchronization in ethernet PHY

Yes, but you'd spend a lot of time on clock recovery. Using start and stop bits is a rather primitive method of embedding a clock inside the data stream -- because only the clock phase is transmitted, ...
Simon Richter's user avatar
0 votes

Shielded Ethernet cables in office buildings - ground loops?

For a cable shield to be effective (at high frequencies) and not act as an antenna, it should be grounded at least at both ends. It should be grounded at those high frequencies only. Vendors who just ...
Kuba hasn't forgotten Monica's user avatar
1 vote

Harmonics of Ethernet (100MBps) MLT-3 signals

Is it possible the two diff frequency emissions, can get modulated in far field and show as diff freq levels? No. "Far field" usually describes "waves in air", and air is for all ...
Marcus Müller's user avatar
0 votes
Accepted

Vivado Ethernet IP core licensing issue

I have had this issue a while ago. Generating the output product also did not worked for me. I have multiple licenses from Xilinx/AMD and all licenses were valid and equivalent (same privilege). When ...
Im Groot's user avatar
  • 309

Top 50 recent answers are included