[Cerowrt-devel] a smart SFP
dave.taht at gmail.com
Thu Jan 13 10:28:13 EST 2022
yes, well, I dislike intensely the implications of
not-so-intelligently splitting those 128 terminals is, and was pleased
to see there was support
at least, for hardware flow control on the uplink side in the spec.
Since we've fixed dsl, cable, and wifi, getting gpon more right has
been on my mind... so pulling a testbed together of some sort would
be cool, and for that matter, having a SFP that could go right into a
SFP enabled home router rather than a separate unit seems like a good
On Thu, Jan 13, 2022 at 6:51 AM Sebastian Moeller <moeller0 at gmx.de> wrote:
> Yes sorry,
> in GPON you have the unit at the telco side, often called OLT (optical line termination/terminal or similar, which feeds the whole segment of up to ~128 remote terminals and receives data from all) the passive splitter (if any) and the remote customer units that are called either ONU or ONT, but that are just two names for the same unit (not sure who uses which nomenclature, the local incumbent seems to prefer ONU, but their marketing name is Glasfasermodem, which just translates to fiber-modem). Nomenclature seems ot be consistent for the whole PON family, so in XG-PON or XGS-PON the unit apparently still are called OLT and ONU/ONT. And given that PON requires some smarts and configurability of the ONUs these tend to be small computers in their own right with their own little (or not so little) OSes.
> > On Jan 13, 2022, at 15:38, Dave Taht <dave.taht at gmail.com> wrote:
> > And a gpon onu
> > https://www.fs.com/products/133619.html
> > On Thu, Jan 13, 2022 at 6:23 AM Sebastian Moeller <moeller0 at gmx.de> wrote:
> >> That is similar to what happens in some GPON-ONT SFPs, some run a full small Linux distribution like OpenWrt inside.... though for ethernet that is unexpected.
> >> This is also similar to SFP VDSL "modems" which likely run their own embedded OS as well inside the SFP package (at a time there was even a PCI VDSL2 "modem" that was actually running its own embedded system on the PCI board, IIRC, it pretended to the main computer to be an ethernet NIC).
> >> Regards
> >> Sebastian
> >>> On Jan 13, 2022, at 15:18, Dave Taht <dave.taht at gmail.com> wrote:
> >>> running linux, of course.
> >>> https://blog.benjojo.co.uk/post/smart-sfp-linux-inside
> >>> --
> >>> I tried to build a better future, a few times:
> >>> https://wayforward.archive.org/?site=https%3A%2F%2Fwww.icei.org
> >>> Dave Täht CEO, TekLibre, LLC
> >>> _______________________________________________
> >>> Cerowrt-devel mailing list
> >>> Cerowrt-devel at lists.bufferbloat.net
> >>> https://lists.bufferbloat.net/listinfo/cerowrt-devel
> > --
> > I tried to build a better future, a few times:
> > https://wayforward.archive.org/?site=https%3A%2F%2Fwww.icei.org
> > Dave Täht CEO, TekLibre, LLC
I tried to build a better future, a few times:
Dave Täht CEO, TekLibre, LLC
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