Omega 2 - Ethernet without Ether dock?

[Thomas Mason]

I literally juuust clicked.... feel like a bit of an idiot for my wording... hehe

so all I effectively need is 4 resistors and 2 caps over the TX and RX pins accordingly - bridged to ground.

Do I need the cap to the TX/RC CT? I assume not? I am just not 100% clear what the 3rd cap on the following page goes to on the following:
See soldered image at the bottom of this page... (not sure about the cap at theh top of the row of resistors)

Just not too sure what pin the TC/RX CT item relates to as per the pin-outs of the onion

Literally on my way to the electronics shop to buy some caps and resistors to test - hopefully I don't cook any components tonight...

[ccs hello]

Tx C.T. and Rx C.T. tied together then go thru a cap to Ground.
There is no need to connect to Omega 2+ side.

Note that EasyJack is not a common part to get in a regular electronic store.

[Thomas Mason]

@ccs-hello the easyjack is just a RJ45 connector which can be soldered to - is it not? or is there more to it? for my application I am happy to terminate to screw connectors, which may simplify things for my application. I am purely concerned with what the safest way is to connect the 2 pairs of wires within a CAT5 cable to the ethernet pins of the Omega2

and I am still not clear what is meant by C.T.?

[Thomas Mason]

Is this not sufficient for what I would need? with 51 ohm resisters and 100 nF ceramic capacitors?

[ccs hello]

NO.
Example of what's inside:

[luz]

@Thomas-Mason The EasyJack is not just a connector, it has built-in transformers, see datasheet of the SI-52003-F.

Without the transformers, you'll create direct DC connections between Ethernet cable and the Omega2. You might get away with that because the other end will have a transformer, but probably impedances are wrong and if you pick up any significant DC voltage (e.g. a PoE capable switch) on the cable, it will fry the Omega2. So I'd say - definitely not recommended.

[Thomas Mason]

I thought I was missing something... I was hoping to get away from the transformer chip to simplify things / lower costs...

seems the cheapest jack I can find here is the following:
Bel Stewart MagJack SI-60002-F (no LED indicators)
of if you insist on the LED's - and want an easy to prototype option, check out sparkfun - RB-Spa-1054

I'll try make time to draw something up later, hopefully help a few other people out with similar needs that might be as new to this as I am

[Marcin Debowski]

This post is deleted!

[Marcin Debowski]

@Thomas-Mason
@ccs-hello said in Omega 2 - Ethernet without Ether dock?:

Tx C.T. and Rx C.T. tied together then go thru a cap to Ground.
There is no need to connect to Omega 2+ side.

Note that EasyJack is not a common part to get in a regular electronic store.

Not that regular but I think pretty available. For example, HR911105A. I got some from Ebay, ca USD4.5 per 5pcs:

Didn't have time yet to check them out.

I found much more difficult to find a human solderable solution for the USB protection circuit and ended up purchasing individual diodes.

[luz]

@Marcin-Debowski @Thomas-Mason

I've been using the HLJ-6115ANL from iTead (datasheet here) successfully for a few projects.

The main advantage over the Bel Stewart is that it has the pins for PPoE (passive power over ethernet, i.e. DC+ on 4/5 and DC- on 7/8). And it's even less expensive.

[Marcin Debowski]

Thanks Luz.

I checked the Hanrun HR911105A module in the meantime and it works without any issues. Direct connection (T to T and R to R, not a cross-over).
.

After all the wiring is done, for a quick test, the network configuration file needs to be edited as per this document:
https://docs.onion.io/omega2-docs/ethernet-bridge.html#step-2-enable-the-omegas-ethernet-connection
and if all was done correctly, the ethernet port should start acting as a WAN if (and Omega as a hot-spot).

[Athar Mian]

@luz

Really interesting... here is a link for Hanrun model volume purchase, $0.60/unit:

https://www.aliexpress.com/item/Free-shipping-50pcs-lot-RJ45-single-port-Connector-With-Magnetics-Module-And-LED-HR91105A-Best-quality/32273895816.html?ws_ab_test=searchweb0_0,searchweb201602_3_10152_10065_10151_10130_10068_436_10139_10136_10137_10157_10060_10138_10155_10062_10156_10154_10056_10055_10054_10059_10099_10103_10102_10096_10147_10052_10053_10107_10050_10142_10051_10084_10083_10080_10082_10081_10178_10110_10111_10112_10113_10114_10181_10183_10182_10185_10078_10079_10073_10070_10123,searchweb201603_2,ppcSwitch_2&btsid=a955abf2-d752-4aaa-ae93-2ecabdc6c021&algo_expid=ca727d12-0407-423f-8ae8-b3b64fe5f6c3-4&algo_pvid=ca727d12-0407-423f-8ae8-b3b64fe5f6c3

Questions:

1. What does CT stand for? Not "coil turn(s)"?

2. What output pins are used for DC +/- on your HLJ model?

3. Can we do PoE on the Hanrun model too? Same pins?

4. Hanrun looks complete with resistors and caps, so no external components needed, I assume? But your model datasheet seems to miss the resistors and caps?

[György Farkas]

@Athar-Mian said in Omega 2 - Ethernet without Ether dock?:

Questions:

1. What does CT stand for? Not "coil turn(s)"?

Center Tap
Here is related to an Ethernet magnetics:
CT is a contact made to a point halfway along a winding of a transformer (or an inductor).

[mike tedeschi]

@Marcin-Debowski Don't send PoE through that han run mag jack, the resistors inside will burn. Or, you can use a PoE injector/splitter, so you remove the DC power from the cat5 before it gets to the magjack.

[ccs hello]

These EasyJack, SmartJack, ... have multiple variants (suffix of the part number) for different purposes.
For PoE application, find the right one with the proper part number.

ccs_hello

[Kjell Sundby]

Hi,

Any chance you can send me the wiring diagram?
I am using the same in my design but cannon make it work.

Thanks,

Kjell S.

[György Farkas]

@Kjell-Sundby For example this is the magnetics of the Seeed Studio's Breakout for Linkit Smart 7688 v2.0 board:

Connect:
P2 to ETH TX+
P3 to ETH TX-
P4 to ETH RX+
P5 to ETH RX-
GND to GND

This is working well with Omega2(+) and any identical magnetics should work too.

[viteo]

Re: Omega 2 - Ethernet without Ether dock?

successfully upgraded bootloader with Hanrun HR911105A. connect as its datasheet suggests