Ethernet testing if connection to switch is present? Data present?

[kripton2035]

seems also the w5100 module "supports" POE but no idea how to check for it ...

[kripton2035]

POE will not work on the w5100 module as the connector is not POE ...
but this arduino module with a W5100 is labeled as POE supported, and the connector is really a POE compatible
https://www.ebay.com/itm/W5100-Ethernet-Module-With-POE-Xbee-SD-Slot-Iboard-for-Arduino/182684436711?hash=item2a88d748e7:g:uOMAAOSwo4pYl6n6

[paulca]

You could use one of these and install a whole bunch of network diagnostic tools

http://www.picotux.com/

Of course not really practical as it requires the network and DHCP to be working.

[Cliff Matthews]

Re-read post #13 since a PHY chip is needed to determine max available link speed. IMHO a 5v module like post #21 looks most viable and by now, one may be available that fully supports 10/100/1000 with auto-negotiate and status LED's (although gigabit hobby modules would seem over-kill supporting sub-$1 mcu's barely capable of pushing 100meg).

FWIW, there are a few versions of PoE from various switch vintages out there. Some may use the + on Telco pair 4/5 and neg on 7/8 with under 48v and low current available (3-5w) while waiting for PoE negotiation to ramp up to 48v (and 15w). Others place PoE over the data pairs but in general, a resistor divider, 2 dpdt switches, a comparator and an LED may be all you need..

[kripton2035]

I looked at wiznet web site , and no they don't seems to have a gigabit version of the W5100.
sure, no actual MCU would be capable of handling such speed.


I was actually thinking of adding one display to my post #26 (arduino+w5100) to also check for any dhcp on the net,
or get a dhcp ip address to have more checking capabilities for a small ethernet tester ?
also some resistors to check if a voltage is present for POE ?
add some li-ion battery for portability.
this could make a nice little device.

[MarkusDK]

Just put an order in for two of those W5100 red ethernet boards now.
Is it just a matter of unsoldering the SMD LED's an putting in a LED in between there (do i need a resistor?)

The smaller the better, and for £3.54 a piece it's worth a try. The smaller the better 

It says it runs on 3.3V? what kind of battery configuration would you suggest? A pair of AAA batteries?

[kripton2035]

there are resistors for the leds, just beside the leds. you don't need any resistor, just unsoldier the leds you need, and solder another led.
there is a voltage regulator on the red w5100 modules, an AMS1117@3.3V, so you can feed them from 4.3v to 15v
it needs 3 AAA batteries, or a 9v battery ? or some dual li-ion module battery ?
when all the leds are on, it consumes around 200mA @ 5V