[hpsdr] Call for Comments and Discussion - OzyII

[jeff millar]

Larry Gadallah wrote:
> 2009/7/26 jeff millar <jeff at wa1hco.net>:
>   
>> Regular Ethernet layer 2, when used with an Ethernet switch provides some
>> routing capability. The switch learns which ports to connect based on which
>> ports respond to traffic. Other ports don't get the majority of the traffic
>>     
>>> How about something like EtherType 0x8906 (Fibre Channel over
>>> Ethernet), since what we want to do basically is to ship a lot of data
>>> from an ADC and/or FPGA decimator to another host?
>>>
>>>       
>> The basic idea of using only the lower layers is to minimize the amount of
>> logic necessary in the FPGA. Ethernet layer 2 is probably sufficient, What
>> does fiber channel offer that would make the extra complexity worthwhile?
>>
>>     
>
> Jeff, I'm not proposing to use fibre channel, only to use the fibre
> channel sub-type for Ethernet layer 2 frames. What I had tried to
> explain is that we should use Ethernet layer 2 frames with a sub-type
> that is likely to be known and handled correctly by present-day
> Ethernet hardware. The reference to fibre channel over Ethernet was
> only to suggest a particular sub-type that would carry the least
> amount of protocol "baggage" above layer 2. If you look at the various
> Ethernet layer 2 sub-types that are available, some of them add a
> significant amount of overhead above layer 2.
>   
Interesting point...  I only have experience with "plain ol' Ethernet" 
in this application.

jeff,wa1hco

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