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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Ethernet switch- Communication

I have a small doubt on using Ethernet switch. Query: Below is my setup will the communication happens between Board1 & Board2 through ethernet switch.
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Alternate IC to 9500A

I want two build a USB to ethernet adapter and was looking around for an IC to do it. It looks like the 9500a from microchip seems to be the popular one. All I'm doing is making a adapter so that I ...
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47 views

Protection and termination of an outdoor underground Ethernet cable

I have quite a quite long outdoor FTP Cat 5e Ethernet cable (just shorter than 90 meters) that will be used to connect 2 buildings, buried 1 meter underground. As I understand, for a proper operation ...
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109 views

sgmii auto negotiation - how long should this take?

I am working with LWIP - and an 1G marvell phy, m88e1111 - connected to a Microsemi SmartFusion 2 FPGA design using 10b8b (aka: TBI) interface. I'm doing something wrong with the auto negotiation and ...
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1answer
12 views

KSZ8081RNACA phy address setting up

I have following PCB design, which use PIC32MZ2048EFH144 and KSZ8081RNACA, I want to set up phy address to be 3. From document it has following words "Config Mode: The pull-up/pull-down value is ...
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106 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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48 views

Are USB and/or Ethernet payload agnostic?

I'm working on a project in which I'm trying to reduce the number of conductors in a high-bandwidth, multi-signal communication interface that requires a fiber connection for isolation and a back ...
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39 views

Using magnetics for single board Ethernet routing [duplicate]

I have two SoCs that are mounted on a the same carrier board using SODIMM connector. The two SoC are mounted very close to each other, the entire carrier board is smaller than 15x15 cm I need to ...
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66 views

How to appropriately test Ethernet hardware?

How should I appropriately test the Ethernet of my device? I have some ideas: Measure signal integrity between the MCU and the PHY or Switch devices (like RMII) Measure the signal integrity of the ...
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107 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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Difference between ARJC01-111002T and ARJC01-111002AR RJ45 connectors

I'm looking at two RJ45 connectors both by Abracon. The ARJC01-111002T and ARJC01-111002AR. They are both 10/100 Base-Tx Tap Up with LED included. The difference lies in the Magnetics schematic: The ...
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1answer
45 views

W5500 2-layer PCB or 4 layers?

I am in process of hiring a freelancer to develop a PCB which will incorporate Wiznet W5500 ethernet IC. Some have suggested a 4 layer PCB, but some are saying it is possible in 2 layers. As the board ...
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173 views

Proper use of the ENC28J60 Ethernet controller

I am using the Microchip ENC28J60 Ethernet Controller in a microcontroller design. The datasheet contains the following reference circuit: I am designing a custom PCB, getting inspiration from a ...
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Ethernet 1Gbps - PCB stackup

I am planning a stackup for 2x Ethernet phys. The chip requires a few different supply voltage levels: I/O Power 3V3 (3 pins) and Analog Supplies: VDD2V5 (2 pins) and VDD1V0 (4 pins). Each pin has ...
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What ist this component on early network cards with a slit in its package?

Early PC network cards (10BASE2, with a BNC connector) often had a two-pin component, typically yellow, with a slit in its package, close to the connector (image source): What is this component, and ...
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How to connect two Ethernet switch ICs together using MII Interface

I have been searching on how to connect two Ethernet switch ICs together. I have designed a custom PCB. Beside some other features, it accommodates an Ethernet Switch IC. This works OK. The bandwidth ...
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33 views

Proper magnetics usage in midspan Power over Ethernet applications

Assuming I would build a midspan PoE Injector that has a Data and a Data+PoE Connector and is supposed to inject power into the Data+PoE Connector, how would I have to use the magnetics in this case? ...
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Ethernet in MIL-DTL-38999 connector

I am hoping to use a MIL-DTL-38999 circular connector for 10/100 Mb ethernet in acc. to IEEE802.3. So the insulation voltage should be at least 1500VAC for 1 min. Most connectors I have seen during my ...
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38 views

PIC Microchip TCP IP Lite Stack on 8bit Microcontroller

I'm trying to learn about ethernet communication on a PIC micro following application note AN1921 however I'm getting compilation errors which seem to imply that the Microchip TCP/IP Lite Stack ...
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KC705 Ethernet to SFP Data pass through design

Board : KC705 Vivado :2017.3 Project: Connect board via the ethernet port and output the data via SFP+ module. No data manipulation or filtration needed. Just take packets and send them. Data rate ...
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43 views

How strong a ground loop would necessitate the use of isolation transformer in Ethernet?

RJ45 ports by spec are magnetically coupled (Why Are Ethernet/RJ45 Sockets Magnetically Coupled?). However, one reason against the use of shielded twisted pairs is the possibility to create a group ...
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2answers
601 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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218 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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77 views

Connecting 50 Arduino slave devices to a single master Raspberry PI

I am designing a automation system and need to have multiple slave devices(probabaly arduino UNO or NANO) communicating both ways with master device (Raspberry PI). There is a server and database ...
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1answer
56 views

SFP+ 10GbE Module Interface

I'm in the process of learning about how SFP+ modules work under the hood. I chose a 10GBASE-T transceiver module as my case study. The module I chose is said to be complaint with SFF-8431 spec, so ...
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1answer
78 views

Receive Ethernet data to the FPGA [closed]

I have Lattice ECP3 Versa Evaluation Board. My objective is to connect Ethernet to the FPGA and be able to receive data (and later to send data) successfully. I don't really care on what protocol I ...
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51 views

ESD Protection for 1Gb Ethernet pre-magnetics able to withstand PoE?

I am looking for suggestions on protecting a gigabit ethernet port from ESD between the jack and the magnetics. Due to the nature of the equipment design, the magnetics cannot be placed next to the ...
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2answers
312 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 ...
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RTL8211E internal regualtor

Currently i am using RTL8211E Ethernet Phy in my application. I just wanted to know the importance of internal regulator of the Phy? As i am using external regulator that is generating 1V0. can i ...
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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 known fact that wireless transmission is hard. Partly because it's a shared ...
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4answers
1k views

ETHERNET communication on PIC micro-controller, where to start?

I need to implement an Ethernet communication between one board with a pic micro-controller and 16-24 other boards with micro-controllers. I don't know how to start even though i entered the ...
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1answer
65 views

Crystal Oscillator Has A Low Amplitude

I have an ECS-2520MV-500 on an unpopulated board that outputs this ~600mV pk-pk signal when I attach 3.3V and GND: According to the oscillator datasheet, the output should have this voltage level: <...
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Can I use an Ethernet switch IC without connecting to the mcu?

I'd like to add an unmanaged Ethernet switch IC to a board I am designing, but I have no free RGMII/SGMII/PCIe connection available on my MCU. The goal of this IC is just to save space/hassle (in the ...
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23 views

Protinet I/O Controller

I need the Profinet I/O Controller. Do you know any controller ? I have a profinet slave device which is send some profinet packet. I need the profinet master or configuration program to make ...
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1answer
35 views

SyncE over wireless?

Doesn't look like "Synchronous Ethernet" exist over wireless like it does on wired. Is there any technical reason for it not existing? On wired, Synchronous Ethernet transfers a 125 MHz master clock ...
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23 views

Profinet IO device Software

How can I use my computer as a Profinet IO device, I need to have some read-write parameters for this purpose. I found this python code: https://github.com/devkid/profinet/tree/master/templates But ...
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20 views

HMI lost connectivity to TCP ip network

I need help with an ASEM HMI130TF with a SCADA program on it works on Windows 7. it is connected with LAN network TCP/ip with a PLC and another HMI, and it has a static ip. the problem is it ...
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2answers
320 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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42 views

Ethernet interface question

Lets say we have an MCU with 10/100Base-T MAC support and we would like to communicate with the 1000Base-X SERDES backplane. How can we do that? Does PHY ICs make an upconversion? Best.
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36 views

Can two Ethernet PHY chips be connected directly through SGMII MAC (without going through MAC chip)?

I need to design something like a media converter: copper interface converts to another copper interface or to SFP optical. I want to use two of Marvell's PHY chips, which will be directly connected ...
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28 views

Why enc28j60 is not responding to another enc28j60?

I interfaced enc28j60 with atmega328p. Then I connected the enc28j60 board1 using ethernet cable to my laptop. I have checked the transmission and reception over the ethernet and it worked. I can sent ...
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1answer
54 views

Use 2 of the 8 cables of an existing ethernet connection

There is an Ethernet cable that runs from a server room to an office. That cable is connected to a router. There are times when ...
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3answers
542 views

Gigabit Ethernet switch unused RGMII/MII/RMII interface

I am working on 5-port gigabit Ethernet switch based on Microchip KSZ9897. As the KSZ9897 is 7-port gigabit Ethernet switch (5 x 1000BASE-T/100BASE-TX/10BASE-Te IEEE 802.3 + 2 x RGMII/MII/RMI) and I ...
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33 views

Single Pair Ethernet PHY

I have been working on a project of industrial device and I'm considering use of industrial interface. I would like to use an SPE interface. I've found a PHY layer DP83TC811R-Q1. Does that module ...
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1answer
40 views

Under-clocking an 10gb Ethernet SFP+ module

The Xilinx device on the Picozed board is a version of the Zynq 7030. The 7030 in general has a GTX transceiver, which in principle is rated to 12.5Gb/s SERDES with the relevant line coding for 10gig ...
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32 views

Clearance requirements from EGND to SGND on ethernet transformer

I have previously been instructed to have a ~70mil clearance between DGND and EGND and to bridge using a 1.5kV 0.47u cap. Application notes also show a 2kV 1000pF cap to EGND off of the center tap ...
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47 views

Small connector alternative for 10/100base Ethernet [duplicate]

I have been looking for a small connector that I can use for Ethernet 10/100 base communication. There were some similar discussions here about the same topic, but I couldn't find a solid answer. In ...
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40 views

Ethernet IC (W5500) functional issues

I am using Ethernet module, W5500 in my circuit. The schematic is attached below: I noticed that the Link LED stays static but whenever I restarts the AC supply switch sometimes the Link LED restarts....
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33 views

Between PC and multiple microcontoller, data transmit and recieve over wifi

I am working on project, in which 4 microcontrollers are involved and each microcontoller is controlling a data aquisition system that reads 2D array(64×64) of sensors So i want to start the data ...
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1answer
168 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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