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

Started by Anonymous in sci.electronics.design6 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...


Simple Ethernet Board with Register

Started by Klaus Kragelund in sci.electronics.design11 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.design2 years 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...


10 mbit ethernet

Started by John Larkin in sci.electronics.design1 year ago 58 replies

Does anyone know the status of 10 Mbit ethernet? Might it be supported long-term for some industrial uses or something? Is it likely to go away?

Does anyone know the status of 10 Mbit ethernet? Might it be supported long-term for some industrial uses or something? Is it likely to go away?


Ethernet magnetics polarity?

Started by Anonymous in sci.electronics.design16 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+ ** ...


RJ45 (8P8C) alternatives IN USE for ethernet

Started by Don Y in sci.electronics.design7 months ago 17 replies

It seems like nothing is coming close to replacing (or, acting as an alternative) RJ45's for ethernet applications. I've encountered ND9's and...

It seems like nothing is coming close to replacing (or, acting as an alternative) RJ45's for ethernet applications. I've encountered ND9's and M8's/M12's on some kit but primarily industrial applications. Any other alternatives that are in "widespread" use (i.e., an application domain with which I might have to interact so "plan ahead")? For daughtercard connections, I imagine anythin...


How does ethernet work when disconnected and reconnected

Started by Klaus Kragelund in sci.electronics.design7 months ago 10 replies

Hi I have a problem with a Ethernet PHY that makes too much noise. We are digging into the problem, iterating on the very poor layout done, but...

Hi I have a problem with a Ethernet PHY that makes too much noise. We are digging into the problem, iterating on the very poor layout done, but the client is looking for a fix right now with now HW changes. The problem comes from the RMII communication to the PHY. Seems a 25MHz clock is feeding the PHY (LAN8742), which then in turn creates a 50MHz clock feeding back to the STM32 MAC. If I...


triggering things with ethernet

Started by John Larkin in sci.electronics.design1 year ago 65 replies

Suppose one were to send a broadcast packet from a PC to multiple boxes over regular 100 Mbit ethernet, without any fancy time...

Suppose one were to send a broadcast packet from a PC to multiple boxes over regular 100 Mbit ethernet, without any fancy time protocols like PTP or anything. Each box would accept the packet as a trigger. Assume a pretty small private network and a reasonable number of switches to fan out to many boxes. Any guess as to how much the effective time trigger to various boxes would skew? I...


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

Started by Anonymous in sci.electronics.design5 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.design11 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.design2 years 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.design9 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.design11 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.design12 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.design4 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...


PoE module

Started by John Larkin in sci.electronics.design1 year ago 7 replies

Looks like a lot of people make a SIP-packaged PoE power...

Looks like a lot of people make a SIP-packaged PoE power module. https://www.mouser.com/ProductDetail/Silvertel/Ag9712-2BR?qs=OlC7AqGiEDmgbLGLmzziyA%3D%3D and they look to be approximately drop-in compatible. They get one or two pairs of DC from the ethernet connector and make isolated DC out, from 3.3 to 24 volts in various versions. So it could be a plug-in option for a little box tha...


GBps to MB/s

Started by amdx in sci.electronics.design5 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.design5 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.design3 years 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...


OT: DOS-based test software

Started by Robert Baer in sci.electronics.design11 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..