Hi Dario,

If i look at the datasheet it looks that it is manufactured in the
Asia's.
See point 5 there is a diference electrical between TX and RX:

5.DCR (1-3) =3D0.7 OHM, (6-8)=3D0.5 OHM, (11-9)=3D1.1 OHM
(http://pdf1.alldatasheet.com/datasheet-pdf/view/106159/ETC/TS6121C.ht
ml )

Harry
 =


> -----Oorspronkelijk bericht-----
> Van: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] =

> Namens Dario Greggio
> Verzonden: donderdag 18 februari 2010 19:22
> Aan: Microcontroller discussion list - Public.
> Onderwerp: Re: [PIC] ethernet transformer
> =

> Wouter van Ooijen ha scritto:
> >> sorry :) thought I had been clear: TX <-> RX; keep primary and =

> >> secondary at place, and so the polarities.
> > =

> > I guess that might work, but I can imagine a manufacturer using a =

> > physically smaller core for the receiver transformer. I =

> would ask the =

> > manufacturer before doing this in quantities.
> =

> I see, yeah, makes sense indeed...
> I can try asking them: it is a TS6121C, though I am not sure =

> who actually is the manufacturer...
> =

> =

> > To save space: maybe use a jack with built-in transformers?
> =

> More than that, it's a housing/casing issue: we'd need a 90=B0 =

> or rather =

> 180=B0 connector, and no complete magnetics is available like that; so

> we're designing the PCB with either a RJ connector or a molex =

> strip to =

> move some few cm apart to a panel connector.
> =

> thank you Wouter
> =

> =

> =

> -- =

> =

> Ciao, Dario
> --
> Cyberdyne
> -- =

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