ethernet magnetics

Started by John Larkin in sci.electronics.design5 years ago 3 replies

Has anyone examined the actual wideband time-domain coupling behavior, like risetime and droop, of typical 10/100 Ethernet magnetics? I plan to...

Has anyone examined the actual wideband time-domain coupling behavior, like risetime and droop, of typical 10/100 Ethernet magnetics? I plan to try a couple that we have in stock, but I was wondering if anyone else has experience. We're considering using them in a non-Ethernet data coupling situation. -- John Larkin Highland Technology Inc www.highlandtechnology.com ...


Simple Ethernet Board with Register

Started by Klaus Kragelund in sci.electronics.design4 years ago 39 replies

Hi For a home automation project, I need to control some devices via an ethernet connection. I could use a raspberry pi, but I am looking...

Hi For a home automation project, I need to control some devices via an ethernet connection. I could use a raspberry pi, but I am looking for something simpler. In some cases I just need to set or clear a relay. Do anyone know of a very simple board with an ethernet Phy on (possibly with a logic output), that can be used for this? Perhaps something like a W5100 based board. https://...


ethernet over a single pair of wires?

Started by mook Johnson in sci.electronics.design10 years ago 6 replies

I'm looking at an application where there is only one avaialble pair of wires through an interface. The wires are in a CAT-5 bundle but only 1...

I'm looking at an application where there is only one avaialble pair of wires through an interface. The wires are in a CAT-5 bundle but only 1 of the twisted pair is avaiable. The length is only about 200 ft. The desired connetion is ethernet with a laptop on one end and a a piece of ethernet industrial equipment (commanding and data monitoring) on the other. Since it is only a single...


Wiznet

Started by David Lesher in sci.electronics.design7 months ago 5 replies

Mouser has a variety of Wiznet serial-> Ethernet adapters that look interesting, but I wonder if anyone has used them. -- A host is...

Mouser has a variety of Wiznet serial-> Ethernet adapters that look interesting, but I wonder if anyone has used them. -- A host is a host from coast to coast.................wb8foz@nrk.com & no one


Sending data from atmel to ethernet conntroler

Started by en2 in sci.electronics.design4 years ago 8 replies

Hi to all. I was just wondering if someone has done some projects where you have to send data over LAN. I use atmega32 and spi ethernet...

Hi to all. I was just wondering if someone has done some projects where you have to send data over LAN. I use atmega32 and spi ethernet module. Is there maybe some opensource code for this ?


How to Avoid Idle Signal on Ethernet Cable IEEE 802.3

Started by Klaus Kragelund in sci.electronics.design4 years ago 64 replies

Hi I have a system comprised of a computer with a TCP/IP application and a gateway connected to this computer. I need to measure the delay of...

Hi I have a system comprised of a computer with a TCP/IP application and a gateway connected to this computer. I need to measure the delay of the gateway, by measuring the delay on the output of the gateway and the signal on the ethernet line But, the ethernet line is active all the time and I do not have a TCP/IP decoder and it is impossible to trigger on the burried TCP/IP packet. From ...


Ethernet transformer core material

Started by mook Johnson in sci.electronics.design9 years ago 5 replies

Wht core material is used for ethernet transformers? Ferrite? Which type? Tape wound? Thanks.

Wht core material is used for ethernet transformers? Ferrite? Which type? Tape wound? Thanks.


Ethernet magnetics polarity?

Started by Anonymous in sci.electronics.design10 years ago 2 replies

When using a gigabit ethernet PHY. Does it matter if one wires the magnetics with the "wrong" polarity like below ..? (reason being pcb routing,...

When using a gigabit ethernet PHY. Does it matter if one wires the magnetics with the "wrong" polarity like below ..? (reason being pcb routing, and the ethernet transformer isn't straightforward) From this: To this: RJ45 pin1 --- MX1+ ** TD1+ --- MDIA_P RJ45 pin1 --- MX1- ** TD1- --- MDIA_P RJ45 pin2 --- MX1- ** TD1- --- MDIA_N RJ45 pin2 --- MX1+ ** ...


Crapy Broadcom 5708 1G ethernet

Started by Anonymous in sci.electronics.design3 years ago 9 replies

We are using a Dell 2950 with two Broadcom 5708 1G ethernet, but the second adapter (in NAT mode) keep crapping out. A similar test setup with...

We are using a Dell 2950 with two Broadcom 5708 1G ethernet, but the second adapter (in NAT mode) keep crapping out. A similar test setup with 0.1G Realtek works fine. The binary Linux driver for the Boardcom is pain in the a* to setup. I would junk it if not build-in on the motherboard. The up-link port seems OK at least. So, we are looking for a second port. One RT8118 is c


The internet of things, or the internet that sings?

Started by Jan Panteltje in sci.electronics.design6 months ago 4 replies

Whatever, been playing with those POE powered sensors, small box, yesterday and 2day was the turn for a CO sensor. Using a MQ-7 sensor, small...

Whatever, been playing with those POE powered sensors, small box, yesterday and 2day was the turn for a CO sensor. Using a MQ-7 sensor, small boxes arrived, could finally put something together: http://www.panteltje.com/pub/CO_sensor_POE_UDP_PCB_IMG_6203.JPG The upside-down sub-board is an ebay ethernet module, but it only has a ENC28J60 chip on it and I already replaced the ethernet connet...


pretty stange board

Started by John Larkin in sci.electronics.design2 years ago 67 replies

We make a lot of weird products, in VME and little Ethernet boxes. They use D25, D37, SCSI50, SCSI68, and D9 i/o connectors. Some products...

We make a lot of weird products, in VME and little Ethernet boxes. They use D25, D37, SCSI50, SCSI68, and D9 i/o connectors. Some products follow sorta repeatable channel/pin assignments, and some don't. We now have a motley collection of test sets and fixtures, some historical creaky DOS/ISA/Bit3 stuff. The new regime will be one universal test box, and Ethernet connection to the test...


Open source 'Pan Tilt Zoom' for Zoneminder?

Started by Winston in sci.electronics.design6 years ago 13 replies

Given the extortionate prices for decent PTZ Ethernet cameras, this seems like a natural project for you talented EE types. * 'Point and...

Given the extortionate prices for decent PTZ Ethernet cameras, this seems like a natural project for you talented EE types. * 'Point and Shoot' HD cameras are now in the ~U$ 100 range. * Microcontroller boards are cheap and plentiful * Servos are cheap and easy to get My Google-fu has been helpless to reveal an open source Ethernet Pan-Tilt-Zoom camera design. Your thoughts please? ...


Funny liitle project, wrote UDP stack, with netcat on top: jppecat

Started by Jan Panteltje in sci.electronics.design8 years ago 6 replies

Wanted to test a Microchip ENC28J60 ethernet controller chip. That chip is 3.3V and 5 V tolerant. So decided to test on the PC par port...

Wanted to test a Microchip ENC28J60 ethernet controller chip. That chip is 3.3V and 5 V tolerant. So decided to test on the PC par port first. Ended up writing a complete UDP ARP subsystem in C, this will add ethernet for next to nothing to anything that has an 8 bits port. http://panteltje.com/panteltje/jppecat/ Those who know netcat will see I wrote a netcat clone on top of the UDP laye...


Ethernet based RGB LED strip controller, diagram and asm source released under the GPL license

Started by Jan Panteltje in sci.electronics.design7 years ago 7 replies

Ethernet based RGB LED strip controller, released an other 11848 lines of asm under the GPL. makes 14476 bytes of program memory, 16k almost...

Ethernet based RGB LED strip controller, released an other 11848 lines of asm under the GPL. makes 14476 bytes of program memory, 16k almost full... http://panteltje.com/panteltje/pic/ethernet_color_pic/ This one uses some power MOSFETS, so it should be able to drive many meters of RGB LED strings. One would almost think I did not know about C... hehe asm is cool.


interference question

Started by Jon in sci.electronics.design6 years ago 11 replies

I want to run 30 amp 10/2 wire 3 inches from phone, ethernet and cable wires. Will the ac line cause interference with the data/voice lines?

I want to run 30 amp 10/2 wire 3 inches from phone, ethernet and cable wires. Will the ac line cause interference with the data/voice lines?


New Audiophool Product

Started by Paul Hovnanian P.E. in sci.electronics.design9 years ago 2 replies

$500 ethernet cables: http://www.usa.denon.com/ProductDetails/3429.asp -- Paul Hovnanian ...

$500 ethernet cables: http://www.usa.denon.com/ProductDetails/3429.asp -- Paul Hovnanian mailto:Paul@Hovnanian.com ------------------------------------------------------------------ Parity on, dudes!


Internet of things, todays box of pandora, eh tronix

Started by Jan Panteltje in sci.electronics.design6 months ago

http://panteltje.com/panteltje/pic/humidity_pic_udp/ because the ethernet chip gets hot, I had to put the sensor outside the box, so the...

http://panteltje.com/panteltje/pic/humidity_pic_udp/ because the ethernet chip gets hot, I had to put the sensor outside the box, so the indicated temperature is correct. Old serial mouse cable, 9 pole D connector, there you are. Works


MicroZED

Started by John Larkin in sci.electronics.design4 years ago 119 replies

Has anybody used the MicroZED? It looks like a good subassembly to use on a controller board. The documentation, especially on...

Has anybody used the MicroZED? It looks like a good subassembly to use on a controller board. The documentation, especially on mechanicals, is spotty. We have an upcoming project that needs a uP, FPGA, Ethernet, DRAM, all that stuff. It's tempting to buy a little board that has all that done and working, running Linux out of the box. -- John Larkin Highland Technology...


RJ45/8P8C alternatives

Started by Don Y in sci.electronics.design3 years ago 39 replies

Hi, I have an irregular-shaped (metal) enclosure to which an ethernet connection must be mated. I can afford to run at 10BaseT speeds --...

Hi, I have an irregular-shaped (metal) enclosure to which an ethernet connection must be mated. I can afford to run at 10BaseT speeds -- though would REALLY REALLY prefer 100BaseTX (-T2 is not a practical option). Connection must be weather-resistant (sheltered location; not "indoor"). The challenge is coming up with a suitable connection without requiring new castings. There are s...


Nanoboard

Started by Jon Slaughter in sci.electronics.design8 years ago 13 replies

anyone here have any experience with the nanoboard 3? I'm thinking about getting it for quick development of things I want to work on such as...

anyone here have any experience with the nanoboard 3? I'm thinking about getting it for quick development of things I want to work on such as audip dsp projects, video stuff(interfacing to lcd's), playing around with ethernet, etc... Seems like a pretty good board on the cheap(as compared to most other good dev boards) and as a lot of cool features. While I don't feel everything on i...