[Vetroc_daq_sbs] addendum

[Carlos Ayerbe-Gayoso]

Indeed, NINO output is LVDS.

I will check with Evan and Scott about their tests. I remember Evan use 
to have ch112 connected with an ECL signal for reference with the rest 
of VETROC inputs coming from the NINO cards, BUT I don' t know if he 
used it well or not.

Perhaps VETROC only admits one kind of signal at the time and cannot mix 
different inputs, although it admits LVDS, LVPECL or ECL (according to 
the manual linked below). That was my test, one port ECL and the rest LVDS.

There is one possibility I didn't check, the polarity of my new cables. 
They look similar assembled like Alex's cables. Monday, I'll try again, 
but in the meanwhile I'm open to suggestions.

https://userweb.jlab.org/~brads/Manuals/Hardware/JLab/VETROC/VETROC-Jul2014.pdf


On 1/20/2018 8:02 AM, Robert Michaels wrote:
> Alright, well let's make sure.  Don't base an entire design on my
> faulty recollection.  But the NINO cards do put out LVDCS, right ?
> And usually one cannot simply mix/match different signal types,
> though I think it might work accidentally that if you put in ECL
> into LVDS ...
>
> Bob
>
> ----- Original Message -----
> From: "Carlos Ayerbe Gayoso" <gayoso at jlab.org>
> Cc: "Vetroc_daq_sbs" <vetroc_daq_sbs at jlab.org>
> Sent: Saturday, January 20, 2018 3:41:09 AM
> Subject: Re: [Vetroc_daq_sbs] addendum
>
> Thank you for your answer Bob.
>
> The "issue" is because for the final set up we need to drive the signals
> almost 30m and it was suggested to use some repeaters and as far I
> understand they handle ECL as output.
>
> Maybe I am misunderstanding all this stuff for the final set up, but John
> Annand and Bogdan mention those repeaters and the LVDS->ECL converters
>
> -Carlos
>
>
> On January 19, 2018 20:23:15 Robert Michaels <rom at jlab.org> wrote:
>
>> I might have this wrong, but what I recall is the the VETROC works with
>> LVDS signals directly from NINO
>> and the main reason for LVDS->ECL is to be able to look at the signals
>> other ways.  Would ECL also work
>> in the VETROC ?  I sort of doubt it, but Ben may know better.  Were you not
>> running with NINO signals ?
>> If it were me, I would naively try the LVDS and see if a signal shows up.
>> Sorry my memory after 1.5 years
>> may be foggy.
>>
>> Bob
>>
>> ----- Original Message -----
>> From: "Carlos Ayerbe" <gayoso at jlab.org>
>> To: "Vetroc_daq_sbs" <vetroc_daq_sbs at jlab.org>
>> Sent: Friday, January 19, 2018 5:23:36 PM
>> Subject: [Vetroc_daq_sbs] addendum
>>
>> I forgot to mention, I have signals in the scope, coming from the LVDS->ECL
>> panel through the ECL->NIM converter.
>>
>> -Carlos
>>
>> ------------------------------------------
>> Carlos Ayerbe Gayoso
>> Postdoctoral Research Associate of Physics
>>
>> The College of William and Mary,
>> Small Hall 328A
>>
>> Jefferson Lab,
>> CEBAF bldg F379
>>
>> Phone: 757 291 7889
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