Ethernet interconnection between two embedded PC's inside one box

Started by Bert in sci.electronics.design10 years ago 5 replies

Hi, I have a question about interconnecting two embedded PC's by Ethernet. Our situation: - PC A has the LXT9785 Ethernet PHY of Intel,...

Hi, I have a question about interconnecting two embedded PC's by Ethernet. Our situation: - PC A has the LXT9785 Ethernet PHY of Intel, internal termination, with 1:1 transformer and 1nF/2kV capacitor at the TX and RX center taps at the secundairy side. - PC B has the 82562ET Ethernet PHY of Intel, termination near PHY, without 1:1 transformer. The specification of this ethernet PHY ...


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...


Ground pour removal around Ethernet & USB traces

Started by Joel Koltner in sci.electronics.design9 years ago 3 replies

Anyone know why Asus removed their (not really needed, IMO, and sometimes much more of a hassle than it's worth) ground pour around their...

Anyone know why Asus removed their (not really needed, IMO, and sometimes much more of a hassle than it's worth) ground pour around their Ethernet and USB connectors as shown here --> http://wiki.openwrt.org/OpenWrtDocs/Hardware/Asus/WL500GP/IMG_0007 ? Is it possibly a UL/CE "safety" thing in that, at least for Ethernet, there could be a largish common mode voltage kicking around?


Wiznet

Started by David Lesher in sci.electronics.design5 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 ?


Re: Wiring a Wall Type RJ45 Jack

Started by flipper in sci.electronics.design8 years ago 2 replies

On Thu, 28 May 2009 17:58:18 -0700, FatBytestard wrote: > On Tue, 26 May 2009 13:24:28 -0500, flipper wrote: > > > > > No, you said...

On Thu, 28 May 2009 17:58:18 -0700, FatBytestard wrote: > On Tue, 26 May 2009 13:24:28 -0500, flipper wrote: > > > > > No, you said coax Ethernet "topped out at 2Mb/s." 10base2 is (thin) > > coax Ethernet running 10Mb/s. As Jasen said, "5 times faster" than > > what you said. > > > > 10base Ethernet is 10Mb/s whether it's twisted pair (


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.design2 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


Ethernet transmitter conformance test

Started by Etienne Menier in sci.electronics.design7 years ago 1 reply

Hi all, I am working on an 10Mbps/100Mbps Ethernet device. On this device, I want to qualify the Ethenet signal quality. I use for this...

Hi all, I am working on an 10Mbps/100Mbps Ethernet device. On this device, I want to qualify the Ethenet signal quality. I use for this operation a dedicated application on an DSO. This application reports two failures concerning rise/fall symmetry. The falling edge (4.907ns) is slower as the rising edge (4.38ns). As I have no visible overshoot, I suppose that the impedance are matchi...


The internet of things, or the internet that sings?

Started by Jan Panteltje in sci.electronics.design4 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...


Ethernet to serial

Started by Dirk Bruere at NeoPax in sci.electronics.design8 years ago 11 replies

Looking for a chip that will do ethernet to serial. What I actually want is to make a little box that will take a UDP and pump out an IR...

Looking for a chip that will do ethernet to serial. What I actually want is to make a little box that will take a UDP and pump out an IR command like a remote. I can buy such devices for about $200, which doesn't seem a bargain. -- Dirk http://www.transcendence.me.uk/ - Transcendence UK http://www.theconsensus.org/ - A UK political party http://www.onetribe.me.uk/wordpress/?cat=5 -...


POE and isolation

Started by krw...@att.bizzzzzzzzzzzz in sci.electronics.design7 years ago 1 reply

The Power Over Ethernet spec requires isolation at both ends of the line. Ok, we've lifted some of the POE concepts for a non-Ethernet...

The Power Over Ethernet spec requires isolation at both ends of the line. Ok, we've lifted some of the POE concepts for a non-Ethernet application and all is fine. I'm looking to expand the system and isolation is getting to be a pain in the neck. Basically, we're driving from RS-422 drivers, through CAT-5, transformer coupled at both ends. Like POE, we're supplying power via the cente...


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...


Re: Wiring a Wall Type RJ45 Jack

Started by FatBytestard in sci.electronics.design8 years ago 2 replies

On Fri, 29 May 2009 18:46:53 +0200, Sjouke Burry wrote: > flipper wrote: > > On Thu, 28 May 2009 17:58:18 -0700, FatBytestard > > ...

On Fri, 29 May 2009 18:46:53 +0200, Sjouke Burry wrote: > flipper wrote: > > On Thu, 28 May 2009 17:58:18 -0700, FatBytestard > > wrote: > > > > > On Tue, 26 May 2009 13:24:28 -0500, flipper wrote: > > > > > > > No, you said coax Ethernet "topped out at 2Mb/s." 10base2 is (thin) > > > > coax Ethernet ru


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.design7 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...