Why public IP address changed for home computer depending on which ethernet port is used on motherboard ?

Started by Anonymous in sci.electronics.design4 years ago 5 replies

ipconfig /all output from home computer: (I manually text-edited/filtered out the IPv4 parts for marvel vs nvidia ethernet port): Today I...

ipconfig /all output from home computer: (I manually text-edited/filtered out the IPv4 parts for marvel vs nvidia ethernet port): Today I used this ethernet port: (marvel): Ethernet adapter Local Area Connection 8: Connection-specific DNS Suffix . : dynamic.ziggo.nl Description . . . . . . . . . . . : Marvell Yukon 88E8053 PCI-E Gigabit Ethernet Controller #3 Physical Ad...


OT: Windows 7 seems to have recently killed my ethernet links

Started by Bill Sloman in sci.electronics.design2 years ago 37 replies

I used to connect my printer to my computer over an Ethernet link, but some months ago that stopped working. I replaced the Ethernet cable with a...

I used to connect my printer to my computer over an Ethernet link, but some months ago that stopped working. I replaced the Ethernet cable with a USB cable plugged into the printer's USB port and didn't think much about it. But my wife's computer used to be linked up to our broad-band link (now fibre to the building) by an ethernet link over the mains wiring, and that stopped workin


Simple Ethernet Board with Register

Started by Klaus Kragelund in sci.electronics.design9 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://...


Halting the ethernet signaling

Started by Klaus Kragelund in sci.electronics.design4 months ago 33 replies

Hi I am working on a product that connects to an access point via ethernet 100 Base TX I am having some problems with common mode noise on the...

Hi I am working on a product that connects to an access point via ethernet 100 Base TX I am having some problems with common mode noise on the ethernet cable, and have been trying all sorts of tricks, nothing help as of now So staring at the signals on the cable, there is a lot of traffic even though we just use it for sub kB/s traffic. The reason for the traffic is the MLT-3 encoding, so e...


Ethernet magnetics polarity?

Started by Anonymous in sci.electronics.design15 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+ ** ...


Monitor dies after HDMI to Receiver + DVI experiment, what is HDMI+ethernet cable ???

Started by Anonymous in sci.electronics.design4 years ago

Hello, I have to report this incident. I have been experimenting with Denon 1909 A/V receiver for audio to 7 speakers. This receiver has...

Hello, I have to report this incident. I have been experimenting with Denon 1909 A/V receiver for audio to 7 speakers. This receiver has a HDMI input. So I was curious if sound quality would improve. First I connected toshiba laptop to receiver via HDMI. The HDMI cable was bought new, it has "ethernet" too which I don't know what that means. Later the PC was connected to the rece...


MicroZED

Started by John Larkin in sci.electronics.design9 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...


wifi command set secrecy - why?

Started by Dimiter_Popoff in sci.electronics.design10 months ago 34 replies

I have been looking for some wifi chip(set) to be able to use in our systems and it has turned out it is impossible to get one which...

I have been looking for some wifi chip(set) to be able to use in our systems and it has turned out it is impossible to get one which is documented in a way we could write our own driver so our tcp/ip stack under dps would treat it as yet another medium, like it does with Ethernet or via PPP and sort of. What I don't get is *why* do they keep things so secret? When wifi was starting there was...


RJ45/8P8C alternatives

Started by Don Y in sci.electronics.design8 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...


DIY PC Oscilloscope

Started by Anonymous in sci.electronics.design10 years ago 53 replies

Hi all, I've started designing a 200 MSPS Oscilloscope with a 25 MHz analog bandwidth, 3Ksample/channel buffer. The oscilloscope can be...

Hi all, I've started designing a 200 MSPS Oscilloscope with a 25 MHz analog bandwidth, 3Ksample/channel buffer. The oscilloscope can be connected to a PC via USB, and eventually via Ethernet and WiFi. The trigger is ( at moment) rising, falling... auto, normal. I would appreciate suggestions and or comment for possible improvement and functionality that could make this oscilloscope interes...


PRBS in LT Spice

Started by John Larkin in sci.electronics.design10 years ago 25 replies

We are considering sending data over CAT6 twisted-pairs, from one FPGA to another at some 10s of meters distance. It might be prudent...

We are considering sending data over CAT6 twisted-pairs, from one FPGA to another at some 10s of meters distance. It might be prudent to transformer-couple the data, to avoid ground-loop common-mode hazards, and the obvious choice would be to use RJ45 connectors with built-in Ethernet magnetics. These seem to have inductance in the 400 uH range, which gives a low-end frequency response in t...


Measuring "payload" skew across network

Started by Don Y in sci.electronics.design2 years ago 17 replies

I have an application that distributes audio among multiple, distant nodes (emitters/speakers) over an ethernet. I control the relative timing...

I have an application that distributes audio among multiple, distant nodes (emitters/speakers) over an ethernet. I control the relative timing (phasing) of the signals from each emitter -- either in synchronism or leading/lagging by specific dynamic amounts (which can be on the order of many ms). To date, I've been measuring this skew in the time domain by emitting a plosive burst whose s...


200Mbps link between FPGAs

Started by Piotr Wyderski in sci.electronics.design3 years ago 73 replies

Hi, I need to reliably connect two FPGAs with a 200Mbps link. The chips will be separated by the distance of max. 2m, no isolation is...

Hi, I need to reliably connect two FPGAs with a 200Mbps link. The chips will be separated by the distance of max. 2m, no isolation is required, an ethernet FTP cable is available. The link should be bidirectional, but the communication needs to be fast in just one direction. Having two unidirectional links is a viable option. PHY layer simplicity is at a premium. I bet that many of you...


GBps to MB/s

Started by amdx in sci.electronics.design4 years ago 36 replies

To prevent spambots I need to answer this question to confirm registration to a forum. "If USB 3.1 Type-C Gen 2 speed is 10Gbps, What is the...

To prevent spambots I need to answer this question to confirm registration to a forum. "If USB 3.1 Type-C Gen 2 speed is 10Gbps, What is the speed of 10Gbps in MB/s (Answer must include MB/s):" I thought it would just be Gig to Meg or 1000, but I ge,t "that is an invalid answer", So I googled and found: " 10 Gigabit Ethernet speed 10 Gbit/s = 1250 Megabytes per second" But that als...


Looking for a bit of help with power over ethernet

Started by Peter in sci.electronics.design3 years ago 10 replies

I've just started digging into POE for a client product. Never looked at it before... Let's say I am using the common Hanrun HR911105A which...

I've just started digging into POE for a client product. Never looked at it before... Let's say I am using the common Hanrun HR911105A which can be seen here http://www.kosmodrom.com.ua/pdf/HR911105A.pdf Now imagine a commonly used passive POE scheme which brings one power wire on 4+5 and the other on 7+8, as described e.g. here https://en.wikipedia.org/wiki/Power_over_Ethernet Tha...


CAN bus

Started by Anonymous in sci.electronics.design1 year ago 11 replies

A customer wants us to build a box (basically a cinder block bristling with connectors) that includes a CAN bus for control. We'd...

A customer wants us to build a box (basically a cinder block bristling with connectors) that includes a CAN bus for control. We'd include ethernet too, for more general use. Can someone recommend a good chip or chip set to do slow CAN? A good eval kit or equivalent? A good way to make a PC talk CAN? We'd have an internal uP, one of the ST Arm things. -- Father Brown's figure re...


Running ethernet over Van Damme 268-307 6 x 75 ohm cable

Started by Peter in sci.electronics.design3 years ago 14 replies

Hello All, For complicated reasons I have this cable in place. It was installed 20 years ago and is inaccessible except at the ends. Total...

Hello All, For complicated reasons I have this cable in place. It was installed 20 years ago and is inaccessible except at the ends. Total length is about 20m. I have not found data on it but there is a 268-307-20 which is a single core 75 ohm coax and this one seems to have six of these, plus what looks like smaller (audio type) coaxes. It looks like a professional video cable. I ...


OT: DOS-based test software

Started by Robert Baer in sci.electronics.design9 years ago 23 replies

I need a program that will determine a computer's hardware: total RAM, [if running inside a given OS for it to report how much is eaten by...

I need a program that will determine a computer's hardware: total RAM, [if running inside a given OS for it to report how much is eaten by the OS, how much physical space unused,total virtual and how much unused]; hard drives (make/model, size, free space); floppy drive capability, serial ports,parallel ports,USB and specs (1/2/3), Ethernet card etc..


New Raspberry Pi 4 presented today

Started by Jan Panteltje in sci.electronics.design3 years ago 45 replies

New Raspberry Pi 4 quadcore presented today: https://www.raspberrypi.org/products/raspberry-pi-4-model-b/ USB3, gigabit ethernet, micro HDMI...

New Raspberry Pi 4 quadcore presented today: https://www.raspberrypi.org/products/raspberry-pi-4-model-b/ USB3, gigabit ethernet, micro HDMI dual display 4K, WiFi, bluetooth H264 and H265 hardware decode, 40 pin GPIO, 1, 2, or 4 GB RAM,. 5V 3 A supply. Only minus I see is that the power consumption goes up and up with each model, my old 1 core raspi only needs 300 mA :-(


Thick/fat/adapter/cylinder like section on HDMI cable ? What is it ? What does it do ?

Started by Anonymous in sci.electronics.design4 years ago 33 replies

Hello, The "high speed hdmi with ethernet cable" I bought looks something like this: https://www.cmple.com/learn/hdmi-cables-28awg What I...

Hello, The "high speed hdmi with ethernet cable" I bought looks something like this: https://www.cmple.com/learn/hdmi-cables-28awg What I want to know is what are these very thick sections on this cable ? Looks like some kind of adapter/device is on this cable ? What is it ? What is it named ? What does it do ? (They look like two big fat round cylinders ?!?) Bye, Skybuck. ...