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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How do I connect my AKM Servo Motor through the Kollmorgan WorkBench?

I have an AKM21C servo motor from NI, connected to a AKD P00306 drive, which is connected to a UMI-7774 board. And I'm trying to connect it through Kollmorgen Workbench, but it doesn't detect a ...
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25 views

Edit option configure on arduino [on hold]

I have similar set up as shown in image. But all device connected to switch 5 port. From Model one LAN connection goto switch port 0 from PC one LAN cable connection goto switch port 1 from Ethernet ...
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1answer
59 views

125 MHz parallel bus in a double 2.54mm header

I have a BeMicro CV low cost dev board from Altera. It features a Cyclone V. FYI: Schematics and gerber here They routed impedance controlled differential lines to some dual 2.54mm standard headers. ...
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2answers
40 views

Interface two Ethernet (10 Base) devices without 4 twisted pairs cable (Common ethernet cable) and 10 Base-T Filter

I'm autumn and recently working on a project that wants to connect two IC with part: ENC28J60 (that connects microcontrollers (with SPI interface) to Ethernet and LAN Networks) directly in a PCB board ...
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0answers
32 views

How to config LAN8710A with PHY by STM32F4x7

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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2answers
92 views

Interference on ADC reading (STM32F4)

I'm using the ADC of a STM32F4DISCOVERY to sample a signal. The sampled values are directly written to the DAC. I tested this and it worked absolutely fine, just as I would expect. Now I wanted to ...
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0answers
35 views

What can be the maximum power consumption in ethernt magnetics circuitry?

I have done little bit calculation regarding PHY IC. In normal mode it is taking about 250mW.
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1answer
41 views

Media Independent Interface (MII) vs Media Dependent Interface (MDI)

Is my understanding about Ethernet - MII & MDI correct? MII - Media Independent Interface is about the connectivity between MAC and PHY. In other words, it is about TXD and RXD signals from MAC ...
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0answers
69 views

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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1answer
82 views

Retrieving samples from an FPGA using Ethernet

I have a Spartan 3 FPGA for implementing a specific kind of digital modulation. I read the output signal by UART and RS232 but the rate is too slow for following high frequency signals. It was ...
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1answer
76 views

TCP/IP stack library for ST microcontroller

I'm looking for a free function library, that implements TCP/IP stack for STM32F103CBT7 (Cortex M3) microcontroller. The datasheet of this controller is following: ...
2
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1answer
65 views

What is the 1G Ethernet jitter requirements?

We have a Stratix V FPGA on which we want to run a 1G Ethernet PHY and MAC. Because we don't have a readily available 125MHz reference clock, we are considering using a PLL internal to the FPGA to ...
2
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3answers
234 views

Is impedance matching a requirement for CAT-5e traces?

I'm building a patch-board for CAT-5e cables, whereby any pin can be re-wired to any other by a set of jumper cables. This is for testing black-box systems where weird things have been done to ...
2
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1answer
100 views

PIC for ENC28J60

I am beginner in the microcontroller world, I started to work with PIC MCUs and writing simple programs in assembly. I am interested in simple controlling via LAN (such as switching LED on/off). I've ...
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1answer
59 views

1000Base-LX or SX Output and Input Requirement Standard

I have a question regarding the 1000Base-LX or SX standard. The question is mainly on the electrical characteristics of the output and input requirements of the 1000Base-X. The standard is based on ...
2
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1answer
39 views

Interfacing Matlab with a NI real time target (cRIO 9073)

I currently have a control system implemented in Matlab that controls a vehicle. The tracking is performed using an overhead camera, and commands are sent to the vehicle via xbee. I have now added a ...
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2answers
76 views

Probing/monitoring ethernet traffic? [closed]

I'd like to monitore my home network for suspicious traffic. The simplest option would be my small switch, which allows to forward each and any traffic to a monitoring port. But that's too easy... ...
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2answers
124 views

What kind of tools would I need to analyze 1000BASE-T/gigabit ethernet waveforms?

I'm an EE student and I'd like to get some visibility into the 1000BASE-T Ethernet waveform. My goal is to induce jitter to learn more about real-world error correction, possibly resulting in research ...
2
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1answer
149 views

W5100: get MAC address from devices in network? [closed]

I'm using a single Arduino Ethernet Shield with an Wiznet W5100 chip to scan a network for all devices. (Find the project source code on Github). All devices are in the same Ethernet segment. They ...
1
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1answer
41 views

Which pins sense collisions at 100BaseT?

Background Suppose I have the following situation... PC with the NIC hard-coded to 100Mbps, Full-duplex RJ45 cable, pinned EIA-568B (not that the colors in the pinout matter) Cisco Catalyst 3560 ...
2
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2answers
81 views

magnetics for ethernet PIC18f

I need to add ethernet connectivity to a PIC18f66j60. The datasheets tells about magnetics. But I know only very little about that. Do you know any surface-mount magnetics suitable for this use ? I ...
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1answer
104 views

Transformer Operation

I have few questions about transformer operation. One of the main points of the transformer is ground isolation. Let's say if have a transformer in an ethernet transmitter, and my circuit in the ...
2
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1answer
254 views

Arduino Hangs when Connected to 220V Supply [closed]

Product Used - 12V 4 in 1 Relay Board (got it from eBay), Arduino Duemilanove, Ethernet Shield. AIM - Control my Room Lights with Arduino. (Home Automation) My Connection - Arduino is connected to ...
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1answer
42 views

Speed of 1000 Base KR

What is the speed that can be supported with 10G 1000 Base KR. I am trying to understand how many diff pairs are required for TX and how many for RX to support full 10G speed.
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0answers
244 views

STM32F4Discovery, an HTTP server and a web page on the SD card

I have an STM32F4Discovery board, and I have implemented an HTTP server on it using the LwIP v1.41 stack. I also have implemented a microSD card reader with SDIO and FatFs, and USB FS as a mass ...
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1answer
45 views

Frame Size and Function

With regards to Ethernet frames, the typical maximum size is 1500 bytes. Jumbo frames brought this up to 9000 bytes, and there was even some Super Jumbo Frames of sizes larger than that. What factors ...
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1answer
90 views

Interrupts and Arduino EthernetShield

I'm in need of a little guidance in a project I'm working on. Basically, I'll be using two arduinos: The first one will have: 1 RF Link Receiver (linke here: ...
0
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1answer
80 views

Multi-drop 100Mbps network? [closed]

We are looking into the possibility to replace our multi-drop SPI (@10MHz) with an alternative solution that allows for more data through put. I've started to look into possibilities of potentially ...
1
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1answer
84 views

PCIE reference clock

I recently completed a PCI-E Gen 1.0 line card design. The line card consisted of 4 Spartan 6 FPGAs sharing one PCIE reference clock. Early on in the design there was a decision to solely use the PCIE ...
0
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1answer
92 views

How can I prevent monitor black-out when using boosted HDMI over Cat 6? [closed]

Thanks for looking! I wasn't sure if this question belonged in the EE Stack, but after thorough searching, I feel it isn't a question that comes up in normal product use. Background: I recently ...
1
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1answer
80 views

Multichannel AoE Hardware

first off I have already found a wealth of information here so thank you! I am hoping to get some general feedback on a project I'd like to work on. Here is an outline. I'd like to be able to ...
7
votes
4answers
988 views

Connecting two Ethernet PHY without magnetics?

In a (tentative) new design I want to connect two 100 Mbit/s Ethernet PHY similar to LAN8270a, separated by few inches on the same PCB, with same ground plane (but different power supplies). I have ...
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2answers
127 views

Ethernet PHY and transformer turns ratio

I'm working on a PoE based system with the CS8900A as the Ethernet PHY. It is specified in the CS8900A datasheet that the isolation transformer required must be of 1CT: 1.414CT for 5V of supply. ...
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1answer
623 views

Ethernet controller ENC28J60 not working with Arduino Nano nor Mega

I have a problem with running ENC28J60 with Arduino with EtherCard.h. This is the device I use: http://img20.allegroimg.pl/photos/oryginal/36/70/08/91/3670089168 This is the library and examples: ...
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1answer
60 views

SFP with copper NIC

We are designing a gigabit copper NIC card. Can we use SFP connectors with copper, or SFP is used only with fiber?
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5answers
405 views

A Bare Bones Internet Connected Microcontroller < $10?

These days businesses are all talking about the Internet of Things and how Cisco predicts 25 billion devices will be connected by 2015. All around the hobbyist community various internet shields and ...
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0answers
64 views

How can I refer to Arduino+ethernet by name [closed]

I've got an arduino with an ENC28J60 based board (one of the el cheapo ebay ones). Works well. I'm using the jcw EtherCard library. As it's setup now, I hardcode a static IP address to access it from ...
0
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1answer
285 views

How to connect WiFi module and Miсrocontroller via MII interface

WiFi module: WIZ610WI Microcontroller: LPC1788 Purpose: Connect it via MII on PCB I have the following scheme: Do I need a signal delay on TX_CLK? On what line and what the value of ...
2
votes
1answer
122 views

Do I have to explicitly connect all pins of the ethernet chip in the FPGA when designing a new controller?

Regarding the Ethernet peripheral of the Spartan 3E FPGA specifically the SMSC LAN83C185 Ethernet chip. The task is to create our own interface between the PLB and the ethernet chip. So far, I've been ...
3
votes
2answers
154 views

What are the specifics of PoE ethernet magnetics

I have a PoE powered design, and it is currently equipped with magnetics not labelled as PoE, HX1188NL. There is also a transformer with a similar topology, HX2019NL. However, the only difference I ...
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0answers
142 views

design suggestion for serial to ethernet bidirectional connection

I am working on a project.My requirement is to enable communication between one serial interface(DB9-RS232) with an Ethernet interface(RJ45), via a microcontroller. after searching a lot, the most ...
5
votes
1answer
179 views

What ferrite for Ethernet Phy?

I'm using a Micrel KSZ8051 Phy in a 100mbps design. The datasheet specifies that it should have a small ferrite bead feeding the power. However, the datasheet doesn't suggest any specifications for ...
0
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1answer
85 views

What is the difference between SBC & Development board?

I was searching for an dev board with RS 232 interface and with capability to implement ethernet interface as well(either on same board or using accessory board) then I came across Single Board ...
4
votes
5answers
623 views

Ethernet RJ45 interfacing with microcontroller

I am working on a project, (still in the nascent stage) where I have to implement a serial communication interface and an Ethernet interface. I tried to find out as much as I can and got the following ...
1
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2answers
178 views

KSZ8863RLL and external PHY (KSZ8051RNL)

I'm designing an Ethernet switch with KSZ8863RLL. It's a 3-way switch but only has 2 integrated PHYs and for the 3rd port it has an RMII interface. Datasheet says that the 3rd port can work in 'MII ...
4
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1answer
155 views

What ultimately determines the speed of electrical media

I have heard several myths about this. Some have said "thicker wires mean faster speed" which I don't believe. Others have said different voltages and others have said higher frequencies. Take Coax ...
3
votes
3answers
393 views

Looking for simple Ethernet (RJ-45) controlled on/off switch for low-voltage DC line

I need to replace a mechanical toggle on/off switch with one that can be controlled with a flavor of Ethernet (e.g. 10Base-T, 100Base-T, or 1000Base-T) using standard RJ-45 port. The line in/out is ...
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2answers
283 views

Recommended Waterproof Cable Gland for Ethernet Cable?

I have a waterproof box that I would like to pass a pre-assembled RJ45 ethernet cable into. What is the recommended cable gland size for this application? Cable glands seem to all be specified with ...
1
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1answer
65 views

MAC Address and ColdFire MFC5329

I am working with the ColdFire MCF5329. I have worked on other projects where the Ethernet function was a separate chip, namely, SMC. The SMC Ethernet chip has pins out for a 64 byte EEProm to store ...
2
votes
1answer
229 views

Using Temac Core - XIilinx Virtex 5 board

I intend to send data packets from my PC to a Virtex-5 board over ethernet cable. I found three ways to achieve this -- 1. Use the Microblaze processor core, using the EDK and SDK tools. (However, It ...