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.
1
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0answers
37 views
Embedded DSP board
I need a embedded system (for real time processing) which can compute some FFT and filtering on average 10000 floating values. More over I need an Ethernet port to send some decisions on my network.
...
0
votes
1answer
58 views
Passive Ethernet Hub / Point to Multipoint Ethernet
I have a device which needs to connect to one of three devices using ethernet. When one device is connected, the other 2 will be powered down. Power consumption is a factor, so I'd like to use a ...
0
votes
1answer
60 views
Piggybacking ethernet/phone on Cat5e?
I've got a phone line on the blue pair, and VDSL on the brown pair. Leaving the orange and green pairs available.
But when I try and connect a router in one room, and a laptop in the other room, I ...
0
votes
1answer
46 views
Ethernet switch selection [closed]
I want to build a small cluster out of beaglebone black computers, this toys support only 100Mbps ethernet and the question is what kind of switch would be the best to connect them all?
I thought of ...
-3
votes
2answers
51 views
Low cost RF and Ethernet combination for automation [closed]
I know its a generalized question but I wanted to know various opinions from users of what they think is the best and low cost, Ethernet and RF combination to be used in the automation project. The ...
1
vote
2answers
49 views
An ethernet PHY chip speed support
I found ENC28J60 Ethernet PHY chip.
The specifications say that the Physical Network Type is '10BASE-T' on the one hand, but on the other hand the data rate is ...
-5
votes
0answers
44 views
Powerline Ethernet [closed]
I have a thesis subject because I'm an ECE student. I was thinking about having a network connection through the powerline. Can someonr help me find a circuit diagram of a powerline ethernet?
8
votes
1answer
109 views
What is the function of this choke-like transformer on the PCB side of this RJ45 jack+magnetics connector?
I came across this ethernet jack+magnetics connector the other day and was wondering what the transformer on the PCB side was for. I thought it looked like a choke, but there is a centre tap running ...
0
votes
2answers
64 views
Non-isolated mains circuit and Ethernet
I'd like to measure voltage and current for a mains circuit using a microcontroller, and connect this to ethernet. Since I want to have 8 independent outputs, using an isolation transformer to measure ...
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0answers
28 views
where have optical port chips mechanism specification for VHDL writing [closed]
i do not know which input or output of optical fiber use in ethernet chip VHDL writing
any documents for optical fiber port chips VHDL practice
do not have enough money to buy expensive FPGA board ...
0
votes
1answer
113 views
What voltage is put across the Tx+, Tx-, Rx+, and Rx- lines over ethernet?
I'm trying to figure out how to wire up an LED, probably controlled by a FET, for an activity indicator for ethernet. I'm not trying to make one that supports official error codes or anything, but ...
-3
votes
0answers
62 views
How to Start with Pic18f controller and ENC28J60 configuration [closed]
I am a newbie to ethernet control operation using pic18f controller and dont know how to configure my Olimex ENC28J60-H Board with PIC18F controller using SPI communication. However i have written ...
0
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0answers
64 views
Clocking scheme for LAN8720A - Cortex M4
This is regarding a design choice involving LAN8720, specific to clocking schemes.
We are interfacing an ARM cortex M4 (with inbuilt MAC) to the 8720 PHY via RMII in the REFCLKO configuration. In the ...
-6
votes
1answer
74 views
Difference between Ethernet and USART? [closed]
As i made literal study about protocols, I came across lot of protocols and there differences but i'm not sure of what is the major merits of Ethernet over USART. lots of websites explained about all ...
0
votes
1answer
90 views
Ideal protocol to read parameters (ex Temperature, voltage, battery status of satellite) from STM32 microcontroller? [closed]
I'm working on an nano satellite project. The task assigned to me is in the Checkout-system module of the satellite.
A couple of parameters from the STM32 microcontroller which will be mounted on the ...
0
votes
1answer
95 views
Ethernet communication between 2 controllers
I'm working on establishing communication via ethernet between 2 microcontrollers.
Its a stand alone system. Controller1 will interface with the user via a keypad. Controller2 will be interface with ...
0
votes
1answer
83 views
Antenna signal through category 5 cable
Can an antenna signal (from an antenna cable) be transfered along with an ethernet signal through a category 5 cable? Will I lose too much signal quality?
Antenna specification:
...
4
votes
1answer
105 views
Selecting communication between microcontrollers at high temperature
I have been assigned to a project to find the best possible communication between several PCB boards which have microcontrollers for a specific function. I need to have all microcontrollers ...
8
votes
2answers
148 views
Is it worth going to so much trouble with Ethernet differential tracks?
I am laying out a PCB containing an Ethernet connector with integral magnetics, and a Micrel KSZ8051MNL Phy. This is for a 100mbps application.
In an attempt to reduce EMI, and make the Ethernet data ...
0
votes
2answers
97 views
Strange I2C behavior: sometime it works, some time it doesn't
I am using Arduino Ethernet with PoE and Arduino Uno boards. In recent days I implemented a working I2C bus by using the Wire library and all it seemed almost to ...
1
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2answers
81 views
How to setup a development network for the ENC28J60 on XP?
I'm working on an ethernet connection with the ENC28J60. During development, I'd like to connect the chip to my computer directly (i.e. not via a gateway). This ...
4
votes
2answers
117 views
What do I need to do to use a R3 Ethernet shield with a R3 Arduino Mega 2560?
I want to use my newly bought Ethernet shield without making any hardware changes, buying anything, and (preferably) add no extra jumper wires. However, it doesn't connect to ...
1
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2answers
66 views
How to avoid SD Card and W1500 SPI mixup on the Ethernet Shield?
In an answer Kevin Mark points to a solution/reason for the usage of the Ethernet shield together with the SD Card. The documentation says that SD Card and the Ethernet chip both share the SPI bus and ...
2
votes
2answers
163 views
2kV capacitor on ethernet?
I'm building the circuit of this article:
C7 is rated 1nF 2kV. Is this right, does this capacitor need to be able to handle 2kiloVolt? Why is that? Is ethernet dangerous?
5
votes
3answers
302 views
Ethernet connector and transformers
I'm working on an Ethernet connection for a PIC18F4620 with the ENC28J60. I found a useful article here, with a schematic:
I see I need transformers between the RJ45 connector and the Ethernet ...
1
vote
0answers
84 views
How to route Gigabit Ethernet, remote PHY or remote RJ45 connector?
I need to design a 10/100/1000 BASE-T “backplane” board that contains multiple PHY outputs from Ethernet controller chips. On the board ,the LAN specifications are very strict in regard to how the ...
0
votes
0answers
48 views
Communication between PTZ camera and an embedded board
I have a PTZ camera which has a serial Communication Port RS-232C and I want to connect it to a single core embedded system which has an Ethenet and USB.
How can I make the connection between the PTZ ...
4
votes
2answers
72 views
Which version is my Ethernet Shield?
It seems that there are different versions of the Arduino Ethernet Shield available. How can I distinguish between the versions? How do I find out which hardware version I have?
Update:
Since Kevin ...
6
votes
2answers
76 views
Ethernet.begin() only works with SD Card removed - why?
When I run this code on my W5100 Ethernet Shield:
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
void setup() {
Ethernet.begin(mac);
}
it only works ...
2
votes
4answers
166 views
Smaller alternative to RJ45 Ethernet connector
I am trying to minimize space usage for an enclosure that holds 48 boards with a RJ45 connector for Ethernet communication on each board. The boards work well with 10BASE-T (2 pairs) connection to a ...
5
votes
2answers
196 views
How to connect RFduino to internet?
I backed the RFduino project on Kickstarter to use it in my next project. It is basically a tiny Arduino compatible board with built in Bluetooth LE that supports additional shields.
I've also got a ...
2
votes
2answers
236 views
Use PCI Ethernet Card with Arduino
I recently bought a PCI Ethernet Card (the computer type), I was wondering if it was possible if I could use it with my Arduino Uno.
Here is my PCI Ethernet Shield:
I have tried to find the ...
3
votes
2answers
117 views
Doubts related to the Arduino Ethernet with PoE
I implemeted a system by using the Arduino Uno and the Ethernet Shield without PoE. Now, I am thinking to use the Ethernet with PoE but I have following doubts, even if I read the Official ...
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votes
1answer
57 views
Arduino over Internet [closed]
I built local web server on arduino and now i want to reach from anywhere to my arduino over internet. But i didn't find any good solution for my problem.
this is my static internet ip: ...
2
votes
1answer
154 views
IAP over HTTP STM32
I am using a STM32F207 Controller interfaced to a Micrel KSZ8995FQ in MII Mode. I use IAP over HTTP available from the ST website for the STM32 Controller.
I am able to upgrade the firmware using ...
1
vote
2answers
135 views
Arduino Ethernet not visible in Router Status
Hey all i am trying to send over my code to my Arduino Ethernet board via the Adafruit FTDI friend. I am using the 1.0.4 version of the IDE and have the following settings:
Tools -> Board -> Arduino ...
0
votes
4answers
158 views
Readying a New Design, would appreciate som feedback
I designed a Arduino shield compatible board around the NXP LPC4337JBD144. so far I have been unable to get the first revision to program.
In the first design the JTAG header was not setup ...
7
votes
2answers
232 views
Interesting 100Mbit Ethernet failure
I have a PCB designed using both 10Mbit and 100Mbit Ethernet, I have produced 100 boards 97% of which work perfectly (both 100Mbit and 10Mbit). On 3% of my boards the 10Mbit operates all the time, but ...
1
vote
2answers
131 views
PC start button effect from electrical point of view
What I basically want to do is to connect one of the digital pins of a network-attached Raspberry PI to (one of) the connectors of the PC Power On button, so that when I issue a command coming on the ...
3
votes
1answer
454 views
Arduino + Ethernet Shield hangs after some time
I am using an arduino to retrieve some data from a web application. The problem is that after some time it starts to hang.
For testing I used the default ...
2
votes
3answers
348 views
Ethernet shield-like functionality for ATTINY IC
I'm looking to shrink-ify my arduino project in the future, and I was wondering if there's anything like an all-in-one 'tiny' ethernet board that'll work with an attiny chip, preferably with the ...
1
vote
1answer
62 views
Cosm.com - Getting return -1 when cosmclient.put
I've implemented successfully in the past, but all of a sudden stopped working, an integration between Arduino with Ethernet Shield, communicating to cosm.com to put live the value of a temp sensor. ...
3
votes
2answers
238 views
Ethernet phy connection: grounding between chassis, connector and IO
The phy chip I'm using has a evaluation board which grounds the chassis, connector and signal gnd points in the following way:
However, I don't really understand why the MCTx connections are ...
6
votes
2answers
181 views
USB vs Ethernet cable length
I was talking to a colleague about the limitations of USB cable length and as far as I could remember it was limited by the tight window the host requires the device to respond in (mentioned here).
...
5
votes
1answer
288 views
What are the 49.9 ohm resistors for in this circuit?
I was wondering what do the 49.9 ohm resistors do in this circuit? Are they absolutely required since I don't have any that size.
3
votes
2answers
166 views
Using any/all Ethernet wires for power transfer?
I was looking to get a small amount of power to be transmitted ~100ft, and noticed there is a standard way to move power over Ethernet cables.
We actually plan to splice the cables ourselves, and not ...
7
votes
4answers
947 views
Difference between Hz and bps
Does Hz and bps mean same? Can a signal be transferred at rate of say Mbps on a channel bandwidth of few Khz?
0
votes
2answers
130 views
daisy chain ethernet: performing arbitration on an FPGA
EDIT:
After discussions in the comments, I've realised that the only way to do this for full-duplex is to use a switching IC.
Also, I mean simplex, not half-duplex for option 1. That is, the FPGA is ...
6
votes
3answers
419 views
Smallest PIC which the TCP/IP stack can be implemented
What is the smallest (size) PIC with internal oscillator available which the TCP/IP stack can be implemented (and used) successfully? Also, what is the smallest (size) PIC with internal oscillator and ...
9
votes
2answers
357 views
How could I power an IC over the Ethernet?
I was looking foward to powering a small Integrated Circuit using only the power provided by the ethernet outlet of my room. Is that even possible?
I've googled and I've found that the voltage that ...
