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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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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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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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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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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44 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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2answers
65 views

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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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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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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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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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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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
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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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20 views

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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30 views

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
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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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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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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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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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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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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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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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32 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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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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Manually selecting which of three ethernet output ports should transmit signal from a single ethernet input, using MCU and transistors?

I have a TV-bench containing three different computer units that all use Ethernet. Although, I only have one measly ethernet output coming out of the wall closest to the bench. Not wanting to clutter ...
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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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Auto-negotiation Disable Issue [closed]

How can I set the ethernet speed ?
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SM453229-381N7Y datasheet confusion/conflict?

I want to use this LAN transformer for my design but I'm getting confused by the datasheet. The electrical schematic section on the first page shows two images. One is a simplefied top view and the ...
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1answer
40 views

USB to ethernet chips like LAN7850 require GPIO to RESET pin?

I am designing a PCB which uses LAN7850 chip This is the first time I'm using such a chip and I'm very newbie to PCB designing. Please advise if this Chip requires a GPIO pin from the ...
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1answer
47 views

PHY to PHY connection (KSZ9477S and DP83849IF)

I want to connect two phys on pcb through AC coupling (max path 150 mm), one PHY is KSZ9477S embedded PHY, other is DP83849IF PHY. The schematic is attached At first the I made a direct connection ...
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49 views

Why does my NVR reset when its UPS switches to battery?

I have a Reolink network video recorder (NVR) that provides 802.3af Power over Ethernet to downstream cameras. This NVR is plugged into a uninterruptible power supply (UPS). I have a switch, whose ...
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1answer
31 views

How MDIO , SGMII is connected with phy chip and ethernet controller?

I am trying to get a picture like how all these are connected. My understanding is that EthernetController ->connects to PhyChip using MDIO Since, while writing linux drivers I have seen I have ...
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1answer
39 views

Sim Card extender Circuit

I am looking for suggestions to solve a Sim card problem. In my system I have a microcotroller interfaced to an Lte mode and this resides in an outdoor elevated position. I would like to put the Sim ...
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1answer
49 views

Ethernet cable with largest conductor diameter

For a Power-over-Ethernet type of project, I'd like to use cables with low resistance. It seems a higher category (CAT5, CAT6, CAT7) does not necessarily mean the conductors used are larger in ...
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ENC28j60 MAC filtering is not working?

I want to send data over udp communication from enc28j60 to my windows pc. I used tuxgraphics udp/ip stack for programming. For monitoring the packet I used wireshark software and also serial ...
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22 views

32F746GDISCO Stackup and Ethernet Impedance

I have an example board with PCB about the ethernet application. I noticed a mismatch between stack up and ethernet lines, or something else I don't know. Ethernet Lines are drawn with 0.125mm and its ...
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Connecting between 'Ethernet Host Controller' and 'Ethernet HUB Switch' on same PCB

I have a question for Connecting between 'Ethernet Host Controller' and 'Ethernet HUB Switch' on same PCB. I want to use only 1 transformer. is it possible? if it is possible, this schematic is ...
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1answer
149 views

Is it better to route Ethernet on the top layer, or to use vias?

I'm making a circuit board with Ethernet (PoE if that makes a difference) coming in through an M12 connector, passing through magnetics and a PHY and going to a micro. I've always heard that there are ...
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46 views

phy chip straping pins

as you can see options strapping pins are multiplexed with RXD# pins .. which are MII interface pins. this will make the PCB have "stubs" (connected to MAC + pullup resistors) which is not good in ...

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