Some SFP module questions

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Hey all,

  I was trying to make a few coins by configuring a Cisco Switch this week, and I had a couple of Single mode SFP modules left over that were not needed.  It got me wondering what the pinout was on them as they are somewhat universal so a little googling provided me with the pinout.  OK, its pretty straightforward and some wiki-searches show the ins and outs of what the pins do.  I then started wondering if I could connect an AVR to these for data communications via the USART in the AVR.

 

This datasheet:

https://www.te.com/commerce/Docu...

 

Shows that the modules data pins are PECL levels and the recommend a SERDES interface.  I also noticed in teh specs that there really is no real minimum data rate, only max which is based on the optics of course.

 

So I was wondering if anyone here ever interfaced a micro...ANY micro to one of these devices? 

 

I can order a few TTL to PECL and PECL to TTL converters from TI for a few bucks to see what happens.

 

anyone have thoughts on this?

 

JIm

I would rather attempt something great and fail, than attempt nothing and succeed - Fortune Cookie

 

"The critical shortage here is not stuff, but time." - Johan Ekdahl

 

"Step N is required before you can do step N+1!" - ka7ehk

 

"If you want a career with a known path - become an undertaker. Dead people don't sue!" - Kartman

"Why is there a "Highway to Hell" and only a "Stairway to Heaven"? A prediction of the expected traffic load?"  - Lee "theusch"

 

Speak sweetly. It makes your words easier to digest when at a later date you have to eat them ;-)  - Source Unknown

Please Read: Code-of-Conduct

Atmel Studio6.2/AS7, DipTrace, Quartus, MPLAB, RSLogix user

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Sorry, no input on your questions Jim, but I will be watching this one carefully. I could use a working solution like this and also have access to some SFP modules.

Wayne

East London
South Africa

 

  • No, I am not an Electronics Engineer, just a 54 year old hobbyist/enthusiast
  • Yes, I am using Proteus to learn more about circuit design and electronics
  • No, I do not own a licensed copy of Proteus, I am evaluating it legitimately
  • No, I do not believe in software or intellectual property piracy or theft
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I haven't used those, Jim, but we used some 'bare opto cable' types for short distance monitoring while testing EMC compliance. The Broadcom/Avago SVH250V and its transmitter friend use a screw-down collet onto bare cut fibre and worked very well at uart speeds. Cheap, too: https://uk.farnell.com/broadcom-...

 

Neil

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WayneZA wrote:
I could use a working solution like this and also have access to some SFP modules.

 

As I make headway I will update the thread!

 

barnacle wrote:
but we used some 'bare opto cable' types for short distance monitoring while testing EMC compliance. The Broadcom/Avago SVH250V and its transmitter friend use a screw-down collet onto bare cut fibre and worked very well at uart speeds. Cheap, too: https://uk.farnell.com/broadcom-...

 

Yes, I have used those in a prior life.  They couple to 1000 micron plastic fibre.  Audio systems use the same technology for TOSLINK.

 

Thing is, those SFP modules are dirt cheap compared to using discrete optics like I have done in the past.  And putting and SFP port on a product allows greater flexibility for connection to various types of Fibre

 

Jim

I would rather attempt something great and fail, than attempt nothing and succeed - Fortune Cookie

 

"The critical shortage here is not stuff, but time." - Johan Ekdahl

 

"Step N is required before you can do step N+1!" - ka7ehk

 

"If you want a career with a known path - become an undertaker. Dead people don't sue!" - Kartman

"Why is there a "Highway to Hell" and only a "Stairway to Heaven"? A prediction of the expected traffic load?"  - Lee "theusch"

 

Speak sweetly. It makes your words easier to digest when at a later date you have to eat them ;-)  - Source Unknown

Please Read: Code-of-Conduct

Atmel Studio6.2/AS7, DipTrace, Quartus, MPLAB, RSLogix user

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jgmdesign wrote:

As I make headway I will update the thread!

 

Thanks Jim. yes

 

jgmdesign wrote:

And putting and SFP port on a product allows greater flexibility for connection to various types of Fibre

 

Indeed, single-mode and multi-mode come to mind because they use them extensively in data networks, so the cable is easy to get too.

Wayne

East London
South Africa

 

  • No, I am not an Electronics Engineer, just a 54 year old hobbyist/enthusiast
  • Yes, I am using Proteus to learn more about circuit design and electronics
  • No, I do not own a licensed copy of Proteus, I am evaluating it legitimately
  • No, I do not believe in software or intellectual property piracy or theft
Last Edited: Thu. Nov 4, 2021 - 08:22 PM
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WayneZA wrote:
Indeed, single-mode and multi-mode come to mind because they use them extensively in data networks, so the cable is easy to get too.
yes

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