Re: [HSSG] 40G MAC Rate Discussion
Hugh
I can understand availability of 4x10GBASE-KR silicon. Are you using
LAG on top of the 4x10G PHY or are
you using a proprietary 40G MAC?
Thanks,
Ali
Hugh Barrass wrote:
> Ali,
>
> There is silicon available today that can run 4 x 10GBASE-KR as an
> aggregated link (4 x 10). It has the advantage that it can support
> links to multiple edge devices or a 40G aggregated link between
> redundant switch fabrics. A single 40G link would be the same cost and
> would take the same real estate as the 4 x 10 links. If you invest to
> make a new generation that can support a single 40G MAC the added
> value will be minuscule, I don't see how you could recoup the
> investment. On the other hand, it would be a similar investment to
> develop the 100G MAC and such a device is more suitable as an uplink
> for a switch fabric that is serving 16 x 10G blades. The 100G MAC,
> along with the attached fabric will be used for the inter-switch links
> and will be more immediately useful, a 40G single MAC would be
> marginally more useful than the 4 x 10 you already have. I know where
> I would bet my investment dollars...
>
> Hugh.
>
> Ali Ghiasi wrote:
>
>> Marcus and Others
>>
>> I like to present another point of view in support of 40 Gig MAC.
>> We currently have the following option on the backplane side
>> - KX-4 (XAUI) 10Gig
>> - KR (1 lane ) 10Gig
>> The natural next step for backplane Ethernet will be to operate KX-4
>> lanes at 10.3125 Gbaud.
>> Regardless of what decision we make in the HSSG 40Gig MAC will exist
>> for the backplane.
>>
>> Assuming we will define the 40Gig MAC sooner or later then allowing
>> 40 Gig MAC
>> for front panel becomes even more compelling, specially when 100Gig
>> is overkill for these
>> applications in near term. If we define 40Gig MAC in the HSSG then
>> defining 40Gig
>> backplane becomes travail.
>>
>> applications.
>>
>> Thanks,
>> Ali
>>
>>
>>
>>
>
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