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Re: 8b/10b and EMI

Dear Ed,

> Ed Grivna <elg@xxxxxxxxxxx> writes:
> I think you missed Joe's point.  He makes reference to a 1-mm hole.
> that is the size hole you would have if you routed only the
> bare fiber through the hole.  This implies usage of a buried
> module, or a module with a fiber pigtail.  In either case, the
> fiber is routed through a metal plate, significantly removed from
> the LASER diode and driver.  The plate is generally constructed as 
> a buried wall in the chassis, with a second bulkhead used to mount 
> connectors.

I don't think I missed the point.  I was attempting to show that this
extremely cumbersome technique is not widely used in low-cost systems. 
Most low-cost modules are not pigtailed.  They have a front-panel
connectors.  In this environment, it is much more difficult to properly
shield things. 

Are you suggesting that we should require a very expensive, telecom
style of construction for low-cost 10GbE ports?  Remember that many
systems may be built in metallized plastic packages with front-panel
mounted non-pigtailed modules. 

Best regards,
Rick Walker