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New uses of FPGAs

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Guest

Mon Jul 08, 2019 8:45 pm   



FPGAs are used in a wide variety of applications from automotive to computing and space. Why are they not used inside optical modules?

Stef
Guest

Mon Jul 08, 2019 10:45 pm   



On 2019-07-08 camil.matiska_at_gmail.com wrote in comp.arch.fpga:
> FPGAs are used in a wide variety of applications from automotive to computing and space. Why are they not used inside optical modules?

In my experience FPGAs don't have very good optical properties, but YMMV.

--
Stef (remove caps, dashes and .invalid from e-mail address to reply by mail)

One family builds a wall, two families enjoy it.

Tomas D.
Guest

Tue Jul 09, 2019 4:45 am   



Altera had a prototype of FPGA with fiber connection to the silicon.

<camil.matiska_at_gmail.com> wrote in message
news:bff76d67-6c88-4255-a170-7f91f52a7359_at_googlegroups.com...
Quote:
FPGAs are used in a wide variety of applications from automotive to
computing and space. Why are they not used inside optical modules?


Edward Moore
Guest

Thu Jul 25, 2019 11:45 am   



On Monday, 8 July 2019 19:45:26 UTC+1, camil....@gmail.com wrote:
> FPGAs are used in a wide variety of applications from automotive to computing and space. Why are they not used inside optical modules?

They are used in SFPs, eg https://www.embrionix.com/

Rick C
Guest

Thu Jul 25, 2019 5:45 pm   



On Thursday, July 25, 2019 at 6:41:58 AM UTC-4, Edward Moore wrote:
Quote:
On Monday, 8 July 2019 19:45:26 UTC+1, camil....@gmail.com wrote:
FPGAs are used in a wide variety of applications from automotive to computing and space. Why are they not used inside optical modules?

They are used in SFPs, eg https://www.embrionix.com/


Are SFPs used for interfaces other than fiber? I see in Wikipedia that 1000 and 100BASE copper is supported. What about other such as T1/E1 or serial port circuits?

--

Rick C.

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- Tesla referral code - https://ts.la/richard11209

Qin Fengling
Guest

Fri Jul 26, 2019 12:45 am   



On Tuesday, July 9, 2019 at 2:45:26 AM UTC+8, camil....@gmail.com wrote:
> FPGAs are used in a wide variety of applications from automotive to computing and space. Why are they not used inside optical modules?

What do you think about PYNQ?
Zynq can be used easily for machine learning.
http://www.pynq.io/ml

Theo
Guest

Fri Jul 26, 2019 12:45 pm   



Rick C <gnuarm.deletethisbit_at_gmail.com> wrote:
> Are SFPs used for interfaces other than fiber? I see in Wikipedia that 1000 and 100BASE copper is supported. What about other such as T1/E1 or serial port circuits?

SFPs are ethernet PHYs. There are PHYs for twisted pair (RJ45), and passive
direct attach copper cables (SFP on each end). T1/E1 and serial ports
aren't ethernet.

I suppose in principle someone could do a 10BASE2 or 10BASE5 SFP, but they
don't seem to exist.

Theo

Allan Herriman
Guest

Fri Jul 26, 2019 1:45 pm   



On Fri, 26 Jul 2019 12:23:57 +0100, Theo wrote:

Quote:
Rick C <gnuarm.deletethisbit_at_gmail.com> wrote:
Are SFPs used for interfaces other than fiber? I see in Wikipedia that
1000 and 100BASE copper is supported. What about other such as T1/E1
or serial port circuits?

SFPs are ethernet PHYs. There are PHYs for twisted pair (RJ45), and
passive direct attach copper cables (SFP on each end). T1/E1 and serial
ports aren't ethernet.

I suppose in principle someone could do a 10BASE2 or 10BASE5 SFP, but
they don't seem to exist.

Theo


Pffft. SFPs, as defined by their SFF, are independent of Ethernet. The
vast majority of SFPs are little more than a laser, a photodiode,
amplifiers and a control/monitoring circuit. This makes them protocol
agnostic, and they work quite well for any optical protocol, such as
SONET or Fibrechannel within their bitrate range.

Some SFPs (they're in the minority) contain active electronics that will
terminate Ethernet (in the form of SGMII, 1000Base-X or 10GBase-X)
protocol on the electrical interface side, and convert it to something
else.
There are many "something elses". I've used ones that convert to:
E1
DS3
1000Base-T
N-Base-T
10GBase-T
There are also SFPs that convert digital video to Ethernet. See this
company for example: https://www.embrionix.com/

Let's not forget Pasive DACs (Direct Attach Cables). These are basically
two twinax cables with an SFP on each end (and also AC coupling caps, an
EEPROM, but typically no microcontroller). The range is limited to a
couple of meters or so at 10Gb/s, but they're the cheapest way to link
equipment in a rack.
Active DACs are like passive DACs but contain amplifiers, to attain more
range (some meters).

Regards,
Allan

Rick C
Guest

Fri Jul 26, 2019 4:45 pm   



On Friday, July 26, 2019 at 7:24:03 AM UTC-4, Theo wrote:
Quote:
Rick C <gnuarm.deletethisbit_at_gmail.com> wrote:
Are SFPs used for interfaces other than fiber? I see in Wikipedia that 1000 and 100BASE copper is supported. What about other such as T1/E1 or serial port circuits?

SFPs are ethernet PHYs. There are PHYs for twisted pair (RJ45), and passive
direct attach copper cables (SFP on each end). T1/E1 and serial ports
aren't ethernet.

I suppose in principle someone could do a 10BASE2 or 10BASE5 SFP, but they
don't seem to exist.


I could be mistaken but I thought a colleague showed me a unit that brought in T1/E1. I could be mistaken.

10BASE2 and 10BASE5 are older technologies that are not so widely used. 10/100BASE-T is much more common and SFP units are available.

--

Rick C.

+ Get 1,000 miles of free Supercharging
+ Tesla referral code - https://ts.la/richard11209

Edward Moore
Guest

Mon Jul 29, 2019 9:45 am   



On Thursday, 25 July 2019 17:24:24 UTC+1, Rick C wrote:
Quote:
On Thursday, July 25, 2019 at 6:41:58 AM UTC-4, Edward Moore wrote:
On Monday, 8 July 2019 19:45:26 UTC+1, camil....@gmail.com wrote:
FPGAs are used in a wide variety of applications from automotive to computing and space. Why are they not used inside optical modules?

They are used in SFPs, eg https://www.embrionix.com/

Are SFPs used for interfaces other than fiber? I see in Wikipedia that 1000 and 100BASE copper is supported. What about other such as T1/E1 or serial port circuits?

--

Rick C.

- Get 1,000 miles of free Supercharging
- Tesla referral code - https://ts.la/richard11209


The company i mentioned do SFPs for SDI over copper, using mini-BNC or DIN connectors. The idea being that you can start off with cheap copper and transition to more expensive fibre. They also do SDI to HDMI SFPs.

Doug McIntyre
Guest

Mon Jul 29, 2019 5:45 pm   



Rick C <gnuarm.deletethisbit_at_gmail.com> writes:
Quote:
On Friday, July 26, 2019 at 7:24:03 AM UTC-4, Theo wrote:
Rick C <gnuarm.deletethisbit_at_gmail.com> wrote:
Are SFPs used for interfaces other than fiber? I see in Wikipedia that 1000 and 100BASE copper is supported. What about other such as T1/E1 or serial port circuits?

SFPs are ethernet PHYs. There are PHYs for twisted pair (RJ45), and passive
direct attach copper cables (SFP on each end). T1/E1 and serial ports
aren't ethernet.

I suppose in principle someone could do a 10BASE2 or 10BASE5 SFP, but they
don't seem to exist.

I could be mistaken but I thought a colleague showed me a unit that brought in T1/E1. I could be mistaken.


https://www.rad.com/products/Pluggable-PNFs-SFPs/MiRICi-E1-T1-MiRICi-E3-T3-Miniature-Ethernet-to-E3-T3-Remote-Bridge


>10BASE2 and 10BASE5 are older technologies that are not so widely used.

Not so widely used? I'd dare say they are extinct. Of course one might
actually find either used in the field, but it'll be a million-to-one find.
Sort of like finding that Amiga still controlling the school's HVAC or whatever.

Average time of a T connector on a 10BASE2 networking flaking out was
measured in months, it would be miraculous if you found a complete
network working.

--
Doug McIntyre
doug_at_themcintyres.us

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