Re: [802.3BA] MMF Extended Reach conference call reminder

[Ali Ghiasi <aghiasi@xxxxxxxxxxxx>]

Alessandro/John

Looking at some of the email trails related to XR several people suggested
for application longer than 100 m just use SMF.  I absolutely agree with the
approach of using SMF for >100m if you could shove the SMF module into the
MMF QSFP cage.

We had several constructive discussion toward a resoluAlessandro/John

Looking at some of the email trails related to XR several people suggested
for application longer than 100 m just use SMF.  I absolutely agree with the
approach of using SMF for >100m if you could shove the SMF module into the
MMF QSFP cage.

We had several constructive discussion toward a resolution for MMF XR
last week with 5 option on the table:
    - Tighter transmitter specifications
   - CDR outside the module
   - CDR inside the module
   - Simple EDC (2 tap DFE) ghiasi_01_0108 was replaced with dudek_01_0708
   - Optional FEC
   - FEC always encode (John P withdraw this proposal)

At the meeting it was stated CDR in the module will be least invasive 
and would not require
defining a 2nd PMD.  There is no guarantee if you put CDR in the module 
the TX or RX jitter will
improve, we have to define a new PMD with full set of TP2 and TP3 
specifications.

If we do not want to define a new PMD for XR the obvious solution would 
be to reference
802.3 CL 52 single optical specifications for SR4/SR10, it already 
defines 300 m on OM3 fiber!

Thanks,
Ali


Alessandro Barbieri (abarbier) wrote:
> Colleagues,
> as proposed during the Ad-Hoc report by John Petrilla at the TF meeting in Denver (http://grouper.ieee.org/groups/802/3/ba/public/jul08/petrilla_02_0708.pdf), we are planning another conference call this Thursday, July 24th 8.30am pacific, to continue the selection process among the remaining proposals on the table (internal CDR, enhanced TX spec and light-weight EDC) and to discuss the best way to add XR to the standard.
>
> Below are the bridge information.
>
> Anyone wishing to present, please follow the guidelines described on the Procedure for Presenters web page:
> http://www.ieee802.org/3/hssg/public/presentproc.html
>
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> Thanks,
> Alessandro
>
>
>
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