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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Correct Ethernet Jack + Magnetics for 100Base-TX

I've been shopping around for Ethernet jacks for use in a personal project. The part specifically states that it's internal PHYs are 100BASE-TX/10BASE-T/Te IEEE 802.3 I understand the basic ...
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111 views

Adding fiber optic ethernet to a circuit

I'm working on a project that involves transmitting data over very long distances (10-25km) where radio communication is unavailable, and I have been looking into the possibility of adding a fiber ...
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1answer
317 views

Embedded Ethernet Solution w/ PoE+; SPI or MII?

I am currently undertaking my first hardware design attempt of an embedded Ethernet project w/ PoE+. I have experience working with embedded systems with Ethernet (mostly ARM M3/M4 processors with ...
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198 views

can i interface profinet protocol to ethernet interface?

i have a profinet device and an Ethernet port which is dedicated for KNX protocol. can i connect my profinet device to this Ethernet port?
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5k views

How to get an ENC28J60 to work?

For starters: Yes I know I'm about to reinvent the wheel with the following task ahead. I want to create my own library for the ENC28J60 for an AVR (ATMEGA1284P). So I've been browsing the net for ...
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55 views

PHY Link only establishing 10 Mbps speed when both devices 100 Mbps capable

I've designed a circuit board with a Microchip switch (KSZ9897) going to a Ethernet-to-VDSL module (LX200V20). The PHY ports between the two devices are connected using a transformerless connection ...
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1answer
180 views

mbed OS 5 TCP Socket

I have a few question regarding mbed OS 5's new TCP API: Some background: I will have multiple mbeds linked via Ethernet to a PC. The PC, whose IP address is fixed and known by each mbed, initiates ...
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32 views

ENC28J60 rejects unicast packets - unicast filter is on, MAC is set, and addresses match

I'm programming an ENC28J60 driver at the moment, and have encountered something odd when attempting to receive packets. More specifically, unicast packets. According to the datasheet, when the ...
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114 views

Servo sometimes freezes when used with another servo and MFRC522 RFID reader

I have looked, Googled and researched all over by now and I have not been able to find anyone experiencing a similar issue to mine, so I thought now would be the time to ask my own question on SE. ...
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72 views

LAN9512 keeps disconnecting from RPi Compute Module

Main problem I'm using a RPi CM and I connected a LAN9512 to it. However it keeps disconnecting: ...
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38 views

Importance of ethernet connector and using a different connector with it

I'm working on designing a modular system where a custom camera has a mounting plate that screws on to a mounting plate on a robot. The camera gets power from the robot over springloaded pins built ...
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513 views

Is this a suitable common mode choke?

I've got a system here where I get 12V DC from a laptop charger which is connected to the wall. That 12V gets stepped down to 5V using the TPS56221 buck converter (running this at 500 kHz, with an ...
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351 views

Problem when debugging ethernet KSZ8081RNB chip on IMX6UL board

I've been working on debugging KSZ8081RNB Ethernet chip for three weeks now and still, I can't find where the problem is. First of all, the board I am working on is including an IMX6UL processor and ...
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500 views

Broadcast traffic issue in PLC Ethernet network

The setting: network with about 10 PCs and 8 AB RSLogix 5000 PLCs. The issue: Everything is communicating OK, but I'm seeing what appears to be a lot of broadcast traffic within the network. It is ...
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1k views

PHY device not responding to MDIO

Update: I have read more about this and what I can conclude is that the phy IC is not initialized correctly. Still no able to figure out how to initialize phy device. Please go through the code and ...
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What shall be changed about stm32f4x7_eth_bsp.c

I am using STM32f407ZGT6. FreeRTOS is running perfectly on Board! I have included Ethernet files. According compilation of Windows Commander stating that it was compiled lacked free. But if one ...
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75 views

Arduino nano + microSD module + ethernet module does not assign IP address

I would like to create a small web server to enable or disable devices via ethernet connection, except that the network module and the SD reader did not seem to work if connected simultaneously. That ...
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61 views

10/100Base-TX Ethernet differential pair routing on a 2 layer PCB

My project involves the ESP32 and Ethernet. To get basic functinallity I intend to use the LAN8720 PHY because it is supported by ESP-IDF out of the box. But I also want to try out the KSZ8863RLL 3-...
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48 views

GBE (Gigabit Ethernet) Magnetic Coils Connection Order

I am designing a MEZ PCB and I need to connect the GBE coils to the assigned pins of single board computer's MEZ connector. My trouble is I do not want to use any more via for this connections. Hence, ...
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42 views

What is the maximum voltage and current for Data Signal in RJ45?

I am using a POE switch 1000Mbs to power a Blackfly camera. I know that each Ethernet port sends 48V to camera. What is the max voltage and current through the data cable. Or would the data signal (...
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45 views

Hardware testing for Ethernet

What are the hardware tests for Ethernet? Just need to verify the MII/RMII timing waveform with respect to specifications given in the datasheet.
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43 views

stm32F401re ethernet shield unable to associate IP address

I bought STM32 F401RE and Ethernet shield HR911105A with MCU W5100. I'm not able to configure simple connectivity with it. I have setup all SPI wires and simple code for setting up IP, subnet, and ...
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1answer
46 views

Add Ethernet Switch chip to project based on PIC18F97J60

We developed an Ethernet-connected device that uses the Microchip PIC18F97J60 controller. This particular PIC contains the PHY that allows us to simply connect the chip to Ethernet magnetics and then ...
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117 views

Single pair ethernet (SPE) PHY with ESP32

can I connect this Single Pair Ethernet PHY http://www.ti.com/product/DP83TC811R-Q1 to a ESP32 chip? Do I miss something? Does anyone already know a Switch for Single Pair Ethernet? Looking forward ...
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30 views

100BASE-TX (MLT-3) to 100BASE-FX (NRZ-I) conversion

Is there a way to convert 100BASE-TX packet to 100BASE-FX packet only by use of MLT-3 to NRZ-I coding scheme convertion by means of simple logic ICs such as some trigger ICs (wichout the use of FPGA ...
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40 views

No connection between host PC and mbed via Ethernet

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1answer
61 views

Transmission distance rs485 vs ethernet

I have a question, why is rs485 limited to less than 100 meters at 10mpbs ( mbaud ) and is 100Base-TX ethernet applicable on 100 meters with 100 mbps bitrate i know that rs485 normally use a sort ...
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37 views

enc28j60 ordere wrong resistors

i prototype a small board with ENC28j60. Instead of 49.9 resistors I have ordered by mistake 47R ones, What do you think? will it work? It is only 10M ethernet
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26 views

ENC28J60 - is this connection correct

Just wondering if this is correct. I never used to design anything using this chip.
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77 views

Why does 100G Ethernet use FEC while Infiniband doesn't?

The 100G Ethernet physical layer signalling is moving to PAM4 and using Forward Error Correction (FEC) when the lane signalling rate is greater than 25 Gigabaud (Either 4 lanes x 25 or 2 x 50). ...
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109 views

LAN8720A - Reset and Power-up Issues

I am developing a new board that uses an STM32F427 MCU and the LAN8720A as an ethernet PHY. This is my first design with this MCU, but I've done multiple designs with this PHY and other MCUs. I never ...
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47 views

Do Broadcom's Ethernet chipsets need special software to operate?

I want to implement an Ethernet switch using Broadcom's chips. Are singing an NDA and getting the datasheets enough to work with the chips? I have heard that the chips must be programmed by a special ...
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72 views

how to implement Pic18f97j60 with PoE Ethernet

I am a beginner when it comes to mcu and electronics design, I did some projects on Arduino and other ready made microchip boards. However this is my first time building something from scratch. I ...
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41 views

problem connecting an Arduino Ethernet Shield to FPGA trough SPI

I have an Arduino Ethernet Shield and trying to connect it to my spartan 6 board. I used the ICSP header on the bottom of Arduino Ethernet Shield (MISO/SCK/RST/+5/MOSI/GND) and a wire for SS(pin 10 of ...
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33 views

CC2530: adapting AVR/pgmspace.h for Zigbee

Goal: Adapt ENC28J60 codes written for ATMega328p (http://tuxgraphics.org/electronics/201204/embedded-ethernet-client.shtml) for CC2530. Problem: No equivalent library for AVR/pgmspace.h available ...
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65 views

Connection of LAN8742A nRST pin causes failure when ESD strike

My circuit uses LAN8742A ethernet phy. The system has a metal case and gets 220V AC to power supply board. After converting 5V DC it goes to my board that has Ethernet and mcu. I screwed case and ...
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75 views

Should I model an ethernet message decoder with byte based instead of bit?

The steaming interface (for example the Avalon ST) input logic data[255:0] in_data; // a 256 bits input stream data The local signals of data like this: ...
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77 views

Testing Ethernet cable with a signal generator and scope

I have been having some problems with my Ethernet lately and would like to test the cable. I was thinking I could borrow a signal generator and oscilloscope from work and get them hooked up to the ...
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144 views

1000BASE-T MDI Return Loss Measurement

IEEE 802.3's clause 40.8.3.1 specifies a certain a MDI return loss. The specification states that this return loss shall be maintained at all times when the PHY is transmitting data or control symbols....
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216 views

How does “bidirectional” transmission on gigabit ethernet work 2?

I was looking for an answer to the question how the 1000BASE-T transmission works and I came up with this post How does "bidirectional" transmission on gigabit ethernet work? but still a few ...
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Incorrect ethernet crc code

I am trying to use the ethernet phy on my FPGA. I am at the point where I can receive a frame. The frame I can see using chipscope matches the data of the frame sent from my computer which I can ...
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3answers
64 views

TX_ER in GMII interfaces

I'm working on an FPGA MAC module and I'm kind of confused with TX_ER signal. A '1' in TX_ER means there's a whatever error in the current packet being sent by MAC. To my understanding, a MAC frame ...
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145 views

Chassis ground and Signal ground isolation for Ethernet signals on VPX PCB

My design requires Ethernet TX/RX differential signals to be routed from Ethernet magnetics to VPX backplane connectors P1 & P2. As per Ethernet PCB design requirements the module signal ground ...
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223 views

Alternatives to RJ45 ethernet connections?

I have a system where two boards need to communicate through a serial bus with several lines --- rates are in the order of up to 3MHz. The boards will be several meters away (say, 3 to 5 meters / 10 ...
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444 views

W5500 Ethernet Chip Layout Advice/Help

I am working on a project that includes the W5500 circuit, this is the first time i had the opportunity to layout Ethernet Interface circuits. Schematic: Whole board and W5500 Module Layout ...
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1k views

RJ45 jack with 8 and 10 pin difference

I need to use the next Ethernet interface design which it's got a RJ45 10 pin, the schematic looks like this: (The RJ45 datasheet is: https://katalog.we-online.de/pbs/datasheet/7499111446.pdf) (PHY ...
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394 views

Ethernet Interface PCB layout requirement (if any)

I am doing Ethernet communication to/from an MCU. I got it working great with an ENC28J60 development module: https://www.digikey.com/product-detail/en/olimex-ltd/ENC28J60-H/1188-1044-ND/3471433 I ...
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67 views

Ethernet Switch used for CCA to CCA comm without FPGA/Proc for MAC

I'd like to connect Ethernet between devices through magnetics without the FPGA or processor involved. For example, I have several off board (PWB) Ethernet signals coming onto my board and then onto ...
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405 views

SGMII, MDIO and link training

I am reading this document : https://www.nxp.com/webapp/Download?colCode=AN3869 I got this link from NXP support, but I did not get a precise answer to my questiosn and I would like to be sure : The ...
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48 views

What is the maximum routing distance between MAC to PHY recommended?

Picture to Keep the Terminology Clear I am in the plan of using ETH for inter processor communication I need few ETH lanes to be shared between boards, i wish to avoid ETH PHY and magnetics as the ...