I have an application that requires two RJ45 jacks on the same ethernet tr/rx pairs coming from a hub. At any one time only one RJ45 will...

I have an application that requires two RJ45 jacks on the same ethernet tr/rx pairs coming from a hub. At any one time only one RJ45 will be connected to a set of magnetics (and phy and mac etc), while the other will be unused with no connections. When I use the outermost connector (the one most further from my hub), I don't expect any problems. If I use the other connector, the one in betwee...

Thanks to all who responded to the previous thread I started regarding AVR+Nut/OS vs. ARM+Linux. I have decided to go with an AVR...

Thanks to all who responded to the previous thread I started regarding AVR+Nut/OS vs. ARM+Linux. I have decided to go with an AVR (Mega128) with external SRAM (32kB or 64kB, probably) and an external ethernet MAC. (I would still consider the AT91SAM7X, except that it doesn't seem to be generally available yet. If anybody knows where I can get it, I'll give it a shot.) For the OS and, more...

I have a new project coming up that calls for a data acquisition board (wot I have to design) to deliver said data over ethernet at a minimum of...

I have a new project coming up that calls for a data acquisition board (wot I have to design) to deliver said data over ethernet at a minimum of 6.25Mbytes/second (not including packetisation/checksum/TCP/protocol overheads). I confess to some trepidation. Now, I'm an old hand at comms and microprocessory. However this is a couple of orders of bignitude larger, bandwidth-wise, than I'm ...

I'm looking for an all-in-one board that includes an embedded processor, ethernet port, FPGA, and 50+ I/O pins. The board should also come with...

I'm looking for an all-in-one board that includes an embedded processor, ethernet port, FPGA, and 50+ I/O pins. The board should also come with a decent software development kit. Any suggestions would be greatly appreciates. -Daniel

I need to start thinking about some Ethernet designs, one as a standalone switch and the other to integrate a 2 port switch with a...

I need to start thinking about some Ethernet designs, one as a standalone switch and the other to integrate a 2 port switch with a microcontroller. I've looked at some datasheets and reference designs and it doesn't seem too difficult but I'm losing myself in a seething morass of unfamiliar acronyms, MII, PHY, OAM Frame, ToS, QoS, VLAN. Well, OK, I've figured out what most of them mean now...

Hello, i am searching for an Ethernet controller supporting 10 / 100 / 1000 MBit/s. Which interfaces are fast enough to use the 1000 MBit/s ?...

Hello, i am searching for an Ethernet controller supporting 10 / 100 / 1000 MBit/s. Which interfaces are fast enough to use the 1000 MBit/s ? Must i use a PCI based system or are there other busses, which can be used ? Regards, Martin

Hi all, I recently started a project to make improvments to one of our old products containing an ethernet module controlled by an...

Hi all, I recently started a project to make improvments to one of our old products containing an ethernet module controlled by an Atmel T89C51RD2. The ethernet interface is unfortunately hardwired to auto- negotiate, which has caused some problems due to the fact that the selected speed is thus 100MBit/sec....quite a lot for the MCU to content with. The crystal used at present is 16MHz...

I'm looking to add a gigabit ethernet switch to a design, 4-8 ports would be ideal. A standalone switch (as long as it can autodetect...

I'm looking to add a gigabit ethernet switch to a design, 4-8 ports would be ideal. A standalone switch (as long as it can autodetect 100/1000) would do, but a switch with a local 100Mb MAC capable port would be ideal. Any ideas? Paul Burke

Hi there, I'm new to the board but have been assigned a tight deadline to complete a project. I need to be able to set up the board to do data...

Hi there, I'm new to the board but have been assigned a tight deadline to complete a project. I need to be able to set up the board to do data aquisition in promiscuous mode on the ethernet, yet I can't figure out how to access the MAC layer. I found a header file (ether.h) that has a turn on promiscuous mode macro definition, but I don't know where or how I would use this, actually where I w...

Has anyone tried this- single twisted pair 100 base T/2? It would appear at first sight to be possible, by connecting the ethernet transformers...

Has anyone tried this- single twisted pair 100 base T/2? It would appear at first sight to be possible, by connecting the ethernet transformers as a hybrid and using half- duplex. It's for an application that uses ethernet internally, at > 10Mb rate, but doesn't need the full 100Mb bandwidth, and it would be useful to lose a pair in the internal wiring. Paul Burke

Hi, I am looking for controlled impedence cable suitable for 100Base-T ethernet. The typical CAT-5e cable one gets has a temperature spec...

Hi, I am looking for controlled impedence cable suitable for 100Base-T ethernet. The typical CAT-5e cable one gets has a temperature spec of only 70 deg C. I need cable that can handle in the order of 150 degC. So far I have managed to find cable from Raychem, but this is priced at US$ 75 per meter. Any pointers would be appreciated. Regards Anton Erasmus

Hello all, I am looking for an ARM processor with integrated Ethernet MAC _and_ PHY. Appreciate any suggetsions. Thanks, Abdul

Hello all, I am looking for an ARM processor with integrated Ethernet MAC _and_ PHY. Appreciate any suggetsions. Thanks, Abdul

Hello all, I need a recommendation for an Ethernet chip. I plan to integrate it with an MCU (probably 8 bit). Either a PIC or an...

Hello all, I need a recommendation for an Ethernet chip. I plan to integrate it with an MCU (probably 8 bit). Either a PIC or an AVR. I've heard of the Realtek 8019AS. Is that a good chip to work with? Is good documentation and schematic examples available for it (i've heard otherwise). Is it considered a little dated given that its an old chip? If so, what others c...

As a hobby project, I want to create a two-port router, and I want to do it from as low as level as possible. I want to program it in...

As a hobby project, I want to create a two-port router, and I want to do it from as low as level as possible. I want to program it in C. Ethernet cables consist of 8 pairs of wires, and from what I know, only 4 of the pairs are used. So let's say I approached this project form the very most fundamental level, let's say I decided to use a run-of-the-mill microcontroller such as a PIC th...

Hey Everyone I am looking start dev with 10/100 ethernet chips and have read up a bit on the DP83848C and some of the realtek chips and...

Hey Everyone I am looking start dev with 10/100 ethernet chips and have read up a bit on the DP83848C and some of the realtek chips and interfacing them with an ARM processor, can anyone recommend any books or sites where i can figure out how to starting coding for ethernet on the ARM (not using uCLinux) thanx :-) Xaropm

Hi, I have a Sitara SK board, similar to BeagleBone Black board. There are below messages on its Ethernet ports. What do the bytes numbers...

Hi, I have a Sitara SK board, similar to BeagleBone Black board. There are below messages on its Ethernet ports. What do the bytes numbers mean? Are they used in running ifconfig? Thanks, ........................................ root@am335x-evm:/home# ifconfig eth0 Link encap:Ethernet HWaddr D4:94:A1:86:09:C3 inet addr:192.168.0.112 Bcast:0.0.0.0 Mask:...

Hi, I was in Halted Specialties Corp. in Santa Clara, CA (www.halted.com), last week and they have Advantech PCM-3660 boards for $15. It's a...

Hi, I was in Halted Specialties Corp. in Santa Clara, CA (www.halted.com), last week and they have Advantech PCM-3660 boards for $15. It's a PC/104 Ethernet board with a 10Mbps Realtek RTL8019AS chip on it. It's not a spectacularly special card by any means, but since PC/104 hardware tends to be pricey I thought I'd mention this deal. -Jonathan

Hellow Guys. My Name is Tiago and i'm from Brazil. I'm looking for references about creating an embedded ethernet microcontroller. I'm...

Hellow Guys. My Name is Tiago and i'm from Brazil. I'm looking for references about creating an embedded ethernet microcontroller. I'm concluding the Computer Science Course and i intend to develop a small controlled board with a serial connector... My plans are connecting the serial port in the ethernet using At89s52(8051 microcontrollers family) and a RJ45 connector... There are som...

I have to create a small network composed by some nodes. At the moment, the number of nodes is about 10, but I want to have a flexible...

I have to create a small network composed by some nodes. At the moment, the number of nodes is about 10, but I want to have a flexible architecture that could increase in the future. I think Ethernet is a very good bus technology that solves many problems to the developer: framing, multi-master, addressing, conflicts, ... I don't need the full TCP/IP stack that needs high resources

I am charged with a holy crusade of debugging a 100bT Ethernet interface of unknown functionality, and the information I've been given suggests...

I am charged with a holy crusade of debugging a 100bT Ethernet interface of unknown functionality, and the information I've been given suggests that there is an analog problem in the media interface. Can someone point me to any kind of preliminary tests I can perform to determine "out-of-specedness" using standard lab tools; scope, DMM, etc? Googling leads me to lots of hellishly expensive ...