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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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Broadcom Ethernet PHY link-up issue

We are using BCM5482SA2KFBG PHY for ethernet link in SGMII mode by selecting INTSEL = 2'b10. The PHY was supposed to establish a link upon power up using Autonegotitation without any management ...
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0answers
61 views

Help! “Ground Loop” preventing new PC from booting with Cat5 plugged in. Is there a fix? [migrated]

I just built a new PC for a friend. Everything works perfectly in my home but not his. But when I delivered it and plugged everything in, we were plagued by (I'm assuming) Ground Loop issues. His ...
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1answer
22 views

Problems with Switch Marvell 88E6060 with high temperature [on hold]

I having issues with the marvel switch 88E6060. https://www.marvell.com/switching/assets/marvell_linkstreet_88E6060_datasheet.pdf When the system reach the temperature of 80ºC the PC doesnt detect one ...
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0answers
19 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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0answers
23 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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1answer
38 views

Ethernet magnetics [duplicate]

I am working on a system prototype which includes two ethernet switches (KSZ9896) to provide Ethernet Gigabit connectivity between several devices (let's call them slaves, from now on); every slave ...
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1answer
37 views

How to get ip address Schneider PLC controller TM218LDAE40DRPHN?

I am new to PLC technology and I am doing the following step, listed below: Connect from PLC to retrieve data through Ethernet using Modbus TCP/IP. I found that PLC didn't have its IP address ...
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1answer
48 views

Does disconnecting the Tx+ and Tx- wires in the ethernet cable make it Unidirectional for Packet (TCP) sniffing

The DCSW-1005(10/100Base-T) Ethernet switch/TAP can be used as a network TAP (as well as Ethernet switch), in which a copy of outgoing and incoming packets associated with Port 1 (Target port) are ...
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3answers
173 views

How to route Ethernet PCB ? [closed]

I am new to PCB routing. In one of my projects, I need to be able to exchange data between nano-computers (https://www.variscite.com/wp-content/uploads/2018/01/DART-6UL_DART-6UL-5G_Datasheet.pdf) ...
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2answers
57 views

Divide RS-485 Simply without switch

I have an RS-485 input / output from a solar charge controller (SCC) and would like to read the output in two locations, while maintaining its input from one, or hopefully both of those locations (see ...
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1answer
25 views

TVS diodes for Ethernet/PoE?

I am getting confused in selecting TVS diode for Ethernet Interface. Should I connect one bidirectional TVS diode across a ...
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0answers
28 views

How to add ethernet connectivity to an existing wifi project

I have been working with the ESP8266-01 wifi module for sometime now. I have managed to send data from an arduino uno board to a webpage via the module. The module runs the AT firmware and from what I ...
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0answers
45 views

Arduino Long Range RF Distributed TCP/IP Ethernet Mesh Network

I am trying to design and build a radio frequency mesh network of Arduino Nano + ENC28J60 + LoRa SX1278 distributed over a roughly 10km^2 campus. The Nano + 28J60 + SX1278 would be used as base ...
2
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1answer
68 views

Using capacitors for ethernet isolation? [duplicate]

The standard for ethernet says you should use a transformer for isolation. It seems like a cap-based solution would be smaller, more versatile, and a better fit for my application. Is there any ...
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0answers
26 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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1answer
28 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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1answer
77 views

ESD strike breaks the LAN8742A ethernet phy

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 ...
0
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1answer
25 views

Interrupt during packet transfer

I'm using the mbed TCP/IP Socket library to receive incoming messages via ethernet. Currently, the incoming data is read in an infinite while(1) loop (i.e. as fast as possible). I will also be ...
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2answers
184 views

DP83848 + STM32 & Failed EMC (massive spikes of 25MHz crystal harmonics)

So we've failed EMC two times now because of spikes of 25 MHz harmonics from 175 MHz to 300 MHz, especially 175 MHz, 225 MHz and 275 MHz with peaks easily 30-40 dBuV above noise floor measured with ...
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0answers
84 views

Problem with PHY KSZ9031RNX

I am facing a serious problem with a design using the PHY KSZ9031 from Micrel. The same schematics are used for both versions of the same product. It is possible to use both speeds from 100Mbit up to ...
2
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2answers
66 views

Finding an Ethernet transformer when I have it's characteristics

I am using the Novatel OEM729 board for a project, and I need to implement Ethernet in the project. According to the Novatel OEM7 manual, page 48, the OEM729 does not have Ethernet magnetics, so I ...
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2answers
75 views

How does Ethernet to CAN conversion work?

I am wondering how an Ethernet-to-CAN converter works. CAN is a multi-master broadcasting network where messages are associated with IDs. Each message type has a unique ID. Devices listen to all ...
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0answers
20 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 ...
2
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1answer
45 views

Power over ethernet and common-mode termination

I have a non-standard Power over Ethernet application (connector, and devices are not ethernet standard but we are using ethernet pairs and protocol for communications). On looking at PoE schematics I ...
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1answer
46 views

Proper connection of choke coil in ethernet magnetics

I need to use the medical ethernet magnetics by Pulse HXU6200NL (it is the only 2MOPP medical-certified PoE magnetics I can find). These are of the rather common transformer/choke coil topology. My ...
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2answers
107 views

Double ethernet magnetics for a passive medical application

I am designing medical data acquisition equipment that requires moderately fast data transfer. As part of the design we are using a custom 100BASE-T PoE architecture (and cabling) to the data ...
0
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1answer
82 views

How come this non-standard ethernet wiring works?

I am setting up ethernet in a friends house with cat 5 cabling. I do not do this professionally but I have made like 20 patch cables and installed about 20 wall sockets before in my own house. My ...
1
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1answer
49 views

Designing an PCIe ethernet NIC with built in ethernet switch

I am trying to design a ethernet network card that will plug into a PCIe slot and have 2 etherenet ports visible to the user that are connected by a unmanaged layer 2 switch. My architecture ...
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0answers
76 views

Long distance internet connections

My friends and I are PC enthusiasts and we are making a NAS, unfortunately we live in a suburb of Melbourne, Australia and internet here is garbage (lower than 8 megabits most of the time) so this is ...
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4answers
1k views

CAT5 for telephony

I wish to extend my incoming telephone connection using CAT5 as I've heard it could provide better performance than standard single stranded telephone wire over long distances. There are only two ...
2
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1answer
103 views

Ethernet controller not recognized on PCIe bus

I designed a carrier board for this SOM: https://wiki.solid-run.com/doku.php?id=products:ibx:documents As I need a second Ethernet port I added an Intel I217 Ethernet controller. Unfortunately it ...
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1answer
77 views

Cable Side and Physical Side of a PoE Magnetics

I am reading the datasheet of PoE Magnetics. I am not able to understand which side belongs to cable side and which belongs to ...
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2answers
176 views

Ethernet switch with 8 ports and PTP [closed]

Hello) I need a solution for a board with 8 100/10 ethernet ports (with copper/fiber switching capabilities, PTP and idealy also with PRP, HSR protocol capabilities). I've found KSZ8999I switch, but I ...
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1answer
55 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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2answers
232 views

Using SFP modules from a microcontroller

I'm interested in having an embedded device send data optically. This is for test and measurement, where having conductive cables is problematic since it will perturb the measurement. The device is ...
2
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1answer
292 views

How can I configure PHY in cubeMX on own board?

I made a customboard using STM32f217VET microcontroller and KSZ8081 PHY (builtin pull-up resistors for TXP TXM and RXP RXM). I Configured my board to use MII mode, anda I used a 25MHz oscillator to do ...
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0answers
80 views

HR911105A connector problem!

I have a stm32f407 microcontroller and I want to use ethernet with DP83848 physical layer. Finally I have HR911105A and when I pluged in and program the microcontroller, when I want to ping, it did ...
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2answers
193 views

Impedance Matching Resistors on MII Ethernet Lines

Microchip is taking forever to activate my account so I will ask this here... I am using the KSZ8081 PHY for MII Ethernet. https://www.mouser.com/ProductDetail/Microchip-Technology-Micrel/...
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2answers
106 views

Can 64b/66b be forced out of DC balance by malicious data?

Unlike 8b/10b and 64b/67b, 64b/66b relies entirely on the scrambler for ensuring DC balance. This raises the question: can a malicious data stream force the line to leave DC balance? Or would it ...
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4answers
161 views

Fiber-optic transceiver ICs for applications other than fiber-optic Ethernet? [closed]

When we talk about fiber-optic transmission, we almost always talk about copper to fiber-optic Ethernet conversion using fiber-optic transceivers. But since fiber-optic communication is just ...
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0answers
56 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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1answer
60 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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1answer
67 views

PHY Register 5 Technology Ability Field Meaning

I have a question about each bit fields(bit 5 to bit 8) of PHY register 5. The following is the description page of a PHY. I know that these fields are Technology Ability Field which is the link-...
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2answers
82 views

Inverting REFCLOCK of Ethernet PHY

A few years ago I had to design a board that uses the NXP LPC1769 MCU and had Ethernet connectivity. I was in need of a PHY chip and the LAN8720 was choosen. During design however, I noticed that NXP ...
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1answer
105 views

LAN9500A Ethernet Adapter

I'm designing a USB-to-Ethernet adapter (actually a prototype of a piece of a larger board). As those following my questions will know, I've had some ups and downs getting the USB part working, but ...
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2answers
64 views

LVDS Flex Cables - Optimizing Trace Layout for 10 GbE

I want to run a 10 Gigabit Ethernet (GbE) signal over a 15 pin LVDS flex cable like this one: My PCB will accept an RJ45 connector, and those traces will run over the PCB to the flex jumper, then ...
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1answer
168 views

KiCad Bus on multiple sheets - Are labels the right way to go?

I want to connect bus-lines via several-sheets in KiCAD 5.0 But I don't know whether I got that right. Please consider the following design: Shown in Figure 1 you can see my connection from the chips ...
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2answers
243 views

Ethernet ground multilayer pcb

I'm currently re-designing a 12-layer pcb. The only thing I am still struggling with is the routing of the ethernet. The layer stackup is as follows: Top Layer GND_1 MidLayer_1 PWR_1 MidLayer_2 ...
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1answer
167 views

Are Ethernet (copper 10/100/1000) compliance tests mandatory?

The IEEE 802.3, for Gigabit Ethernet, and supposedly the ANSI INCITS 263*, for the Regular and Fast Ethernet, have lists of signal quality requirements, which are generally tested using the so-called ...
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2answers
111 views

How reliable is using couplers to extend Ethernet cables?

I want to obtain one 90 meters of Ethernet CAT6 cable(with RJ45 connectors) by using three 30 meters of CAT6 cables with RJ45 connectors. The only option I could find is to use three such couplers. ...