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Questions tagged [ethernet]

Questions about the electrical implementation of Ethernet; ask another Stack Exchange for software or protocol questions. Specify the speed as 10/100BASE-T is somewhat different from 1000BASE-T, apart form the speed. Those are copper standards; Ethernet over fiber optical cable is also defined.

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26 views

EMC testing of devices with Ethernet

I've made a board with two Ethernet ports on it and so far when testing it for EMC I've been connecting them together with a single cable. My assumption was that since there are constant keepalive ...
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Vivado HW manager connection via Ethernet for Ultrascale+ xczu2cg

I have MPSoC with FPGA Xilinx Ultrascale+. The MPSOC has ethernet connection, which I can ssh via my PC but does not have PROG USB Cable. After generating bitstream in VIVADO, I used to program my ...
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Voltage mode ethernet driver to current mode ethernet driver connection

We are trying to connect two ethernet PHYs - KSZ8999 and AR8035. Here is the schematics. The schematics comply with the following document (figure 4) - SimpliPHY Transformerless Ethernet Designs - ...
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Do i need to follow ethernet cable specs?

I have 2 pcbs one has the Ethernet Mag Jacks lets call this board 1,board 2 has the ethernet connectors.Do i still need to follow cable spec using a twisted pair for the ethernet signals in the ...
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39 views

Integrating an ethernet switch IC to custom pcb with mcu using RMII

I have a custom board with LPC1768. It has also PHY (LAN8720) in order to connect to LAN via RJ45. So far so good. Now, I have ...
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91 views

Interfacing Wiznet W5300 with a Spartan 3 FPGA?

I have to interface Wiznet W5300 chip with a Spartan 3 FPGA for sending packets over Ethernet using the Hardwired TCP/IP feature of Wiznet. I am planning to interface using the direct/indirect bus of ...
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1answer
40 views

Ethernet : mismatch between diff pairs

I am designing a 4- layer PCB with Ethernet (RMI) and integrated magnetics, which I want to make as good as possible with respect to signal integrity and EMC. RMI, so the frequency is 50 mHz. Because ...
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74 views

Ethernet RMII using ribbon cable

I am trying to interface the Ethenet using RMII at 100 Mbps speed. The main board is a RH850 F1 evaluation board. Ethernet RMII transciever is a DP83848 chip on a waveshare External Transciever Board ...
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90 views

Daughter board Ethernet connector

I need to connect 100Mbps Ethernet PHY signals from my main board to RJ45 connector on daughter board through an on board header like shown below. Ethernet will be used only in the board bring up ...
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1answer
29 views

Ethernet cable react with anti-theft RFID gate

Yesterday I was leaving a shop, I had an ethernet cable in my backpack, and it reacted with the anti-theft gate, causing a false alarm. I was just wondering why.. I had also other cables (hdmi, power ...
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Why is wired Ethernet losing its speed advantage over wireless?

This has been bugging me for a while now. I did a couple wireless transmission courses back in my university days and it's a know fact, wireless transmission is hard. Partly because it's a shared ...
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48 views

Determine end of USB Data OUT packet on device (STM32)

I'm busy with a USB to Ethernet implementation (ECM) on an STM32 using the ST USB library (not HAL) and LwIP. When I send a packet to the host (Data IN) that came from the ethernet interface, I know ...
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19 views

Unable to receive packets on ENC28J60

I am using a CC1352P1 launchpad from TI and trying to connect it to ENC28J60 for ethernet. I am able to transmit messages to my computer such as an ARP request, and the computer recognizes it and ...
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38 views

Is there a RJ45 with magnetics for PHY less network switch

I have a network switch indoor and camera outdoor. I plan on having a PCB with RJ45 with magnetics. Can any tell me how to choose an RJ45 with transformer for a PHY Less network switch.
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107 views

Ethernet with transformer

I have a schematic of Ethernet Transformer that supports POE, and 2.5GBT. I plan on using Ethernet with transformer on my PCB to connect to Network Switch. Are pin VC12 13, VC36 14, VC45 15, VC78 16 ...
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80 views

How do Ethernet controllers show activity with the LED indicator?

Ethernet controllers usually have an "activity" LED which blinks in some sort of correspondence with the packets traversing the port. I'm wondering how the controller decides when to turn the LED ...
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21 views

EasyE4 send data to database [closed]

I am trying to use an EasyE4 (from Eaton) to measure several sensors in my stable. It needs to send a value to the database when it measures something from a sensor. How can I do this? Can i send this ...
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71 views

The SERDES/transceiver design inside the Ethernet MAC controller

I'm a little confused about the "SERDES" interface between MAC and PHY chip, and I drew some figures to illustrate the connections which confuse me as shown below. The MAC controllers in 3 figures are ...
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1answer
80 views

+Tx +Rx -Tx -Rx Connectivity

I have a sensor that I am trying to connect to via an ethernet cable. The sensors pinout gives "Signal Name:" +TX +RX -TX -RX. My assumption would be to hook up: +TX to +RX (ethernet pin: ...
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29 views

using sig generator and scope as TDR for troubleshooting ethernet

I had some problems with a new run of cat5e. I have already established it's definitely a damaged cable using a cheap network continuity tester and double checking my wiring and crimps. I saw on ...
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31 views

Anyone hear of GMOV - Metal Oxide Varistor in series with Gas Discharge tube

I am currently working on protecting the Network switch. The network switch is powering a camera outdoor. I have read through multiple tvs components, and found advantages and disadvantages. Until ...
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2answers
57 views

Two Gas Discharge Tube in parallel; a fast acting gas acting tube and a gas discharge tube

I want to know what happens if we put two gas discharge tube (fast acting GDT and a GDT in parallel), and a tvs diode in parallel. Would there be an issue in putting GDT in parallel? Datasheet of ...
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1answer
25 views

Webcams and Nanos. Cabling and interference advice sought

4no. USB webcam, 2MP modules into a Jetson Nano. The cameras are to be positioned between 7 and 14 metres from the Nano. The cables will be fed through conduit together. Distance: Would you ...
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1answer
60 views

GDT in parallel with TVS diode. Should the clamping voltage of the TVS diode be equal to the DC breakover of GDT?

I am putting a GDT in parallel with TVS diode, and I want to know if I need to have clamping voltage of TVS diode slightly higher than DC breakover voltage of the gas discharge tube OR have clamping ...
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41 views

IO standard for RGMII interface of ethernet

I'm learning about the RGMII interface of ethernet. Can anybody please tell me What IO standard does the TX and RX line of RGMII interface support? Please help. I'm just a beginner
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54 views

Gas discharge tube datasheet impulse sparkover specification

What does the Impulse Sparkover at 100 V/us and 1000 V/us mean? Does it have anything to do with arcing? How does the impulse help us decide with which GDT to choose?
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42 views

Two MCU Connected To Same Ethernet Port

Hello iam a bit stumped with this i have 2 mcu's both MSP432E on the same pcb.I only have one ethernet port but need both MCU's to be connected to the one ethernet port.Can i simply have 2 ethernet ...
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1answer
54 views

Ways to decrease TVS diode capacitance

I am currently working on high speed ethernet data line, and I wanted to know if there is a way to decrease TVS capacitance. I thought of putting two TVS diodes in series to reduce capacitance. ...
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21 views

How do I calculation to see if Thyristor complies with DO-160G indirect lightning protection

I have been working with TVS diode and found that the capacitance of tvs diode is large; therefore, I will not be able to use tvs diode. Thyristor, on the other hand, has low capacitance for high ...
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65 views

Ethernet vs CAN bus physical signal

Reading about Controller Area Networks and Ethernet standard, I cannot understand why there is a difference in the way the signal is transmitted. Both protocols use twisted pair cables to communicate, ...
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34 views

How do you determine what amount of capacitance is bad for data lines?

I am currently deciding on putting a TVS diode from line to ground on POE ethernet. The issue is that I don't know how the capacitance of TVS diode will play role on the data signal. Is 1000pf bad or ...
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22 views

No ethernet connection with Atmel Start example with custom board

I want to use the Atmel Start ethernet example with my custom board what contains the Atmel chip ATSAME70Q21A-AN and Ethernet Phy KSZ8041TL. To test the ethernet connection on the board I used Atmel ...
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27 views

Receive packets and read routine ENC28J60

I am using an ENC28J60 Rev 7 (REVID = 0x06) with a TI CC1352P microcontroller. Trying to transmit and receive ethernet packets between the MCU and my computer. I was able to transmit packets from my ...
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33 views

Do I need to include another set of termination resistors? (design specific)

I am including an ethernet pass through in a design. I am wondering if I need to include more termination resistors on the second(left) RJ45.
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1answer
59 views

A few questions about the application of ethernet controller and PHY chip and SFP module

I have a question about the connection/application between the ethernet controller and PHY/SFP modules. Actually, there're so many scenarios for building up a NIC card, which makes me confused. For ...
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1answer
111 views

A TVS for lightning surge protection

A camera will be mounted outside and powered via POE to Aruba 2540 network switch. I don't want indirect lightning surge to travel into the network switch. I don't care if the camera gets destroyed. ...
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1answer
60 views

Ethernet PHY clock and sync

I have a general question about reference clocks for ethernet PHYs. The PHYs I have seen so far require an external clock source like a xtal or other singleended clock (in addition to the clk lines ...
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1answer
59 views

Does 10GBASE-R fully replace 10GBASE-X?

10GBASE-R using 64b/66b encoding scheme (3% overhead) 10GBASE-X using 8b/10b encoding scheme (20% overhead) 10GBASE-R is achieved with single xcvr lane 10GBASE-X is achieved with 4 XAUI xcvr lanes &...
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36 views

Gearbox in 10GBASE-R Ethernet protocol

In 10GBASE-R specification, Gearbox is defined to take care the data width adaptation between PCS & PMA. For example, after the 64b66b encoding, the PCS data width will become 66bits. The gearbox ...
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65 views

How to connect CPU with RGMII pins to an LTE module that takes only SGMII signals?

The Hi3519 Hisilicon CPU has RGMII pins. We are trying to connect it to the EC21 LTE Module from Quectel which contains SGMII pins. Would using two Realtek RTL8201F-VB-GG PHY chips with magnetics ...
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40 views

HR911105A or similar integrated magnetics for POE

Is it ok to use this RJ-45 socket for low power POE application (just to power the uC)? The only available datasheet : https://www.google.com/url?sa=t&source=web&rct=j&url=http://www....
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64 views

Bosch security camera pinout

I have a Bosch NDC-274-PT security camera that had the wiring cut off at the base. It's a POE security camera (though it also supports regular 12 or 24V power), so I was hoping to find typical ...
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43 views

ENC28j60 ethernet interfacing with efm8lb1 help needed

I am a newbie to ethernet controller. I went through ENC28j60 documentation But I couldn't find a proper example similar to my project. EFM8LB1 will read some sensor data (for example sensor data '...
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50 views

Download a file from web browser to Micro SD card [closed]

I am trying to do a web server to store a file (mostly MP3) on a Micro SD card. I have stm32f407-discovery and w5500 and a Micro SD card reader (unbranded manual pcb drawed). How can I open a web ...
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What to do with unused Ethernet magnetic center taps on POE?

I'm using a MAGJACK GIG PDJACK 1X1 CLASS 4 (Molex # 0857914020 - Link: https://www.digikey.com/products/en?keywords=WM9656-ND) to run POE on a 100MBit network connection. I thought this was a nice ...
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1answer
79 views

Practical considerations using Ethernet bus for a large number of sensors?

I understand that an Ethernet bus design with hubs has largely been superseded by star topologies with switches and that is largely due to the issues of collisions. However, I am interested in ...
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1answer
63 views

Adding ethernet jack and transformer to device designed without one

I'm attempting to add an RJ45 Ethernet jack to a commercial device without one by replacing an embedded WiFi module, which, according to its datasheet, is connected to the rest of the system as ...
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62 views

Ground loops with S/FTP Cat6 Ethernet cables

I have an issue with an Ethernet cable causing a ground loop between my router and a raspberry pi, causing noise on the ground of the DC power of the Raspberry. The router/power supply of the RPi are ...
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1answer
179 views

Can I swap TX+ and TX- (and RX+ and RX- ) using ethernet magnetics?

I am building ethernet connectors and a switch into a product. There is a requirement to include PoE which I haven't done before. This has required the use of a new magnetics chip to expose the two ...
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1answer
431 views

Connecting an STM32 at Ethernet

I am trying to connect the STM32F103 (blue pill) with the specific w5500 module via the SPI bus. The physical connection I made was ...