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So what's the deal with 10Gbase-T

 Gotcha.  With SFP+ I think the only nod to backward compatibility would
be 1gbit RJ-45 SFPs, which can get a little spendy in large numbers
(although so can DACs).

 As for distance, I admit I haven't encountered any DACs longer than 15
meters (~49 feet) -- not that I'm positive they don't exist.


On Mon, Oct 1, 2012 at 2:10pm, Andreas Echavez wrote:
> Mostly backwards compatibility; simplicity. We're planning for some
> super-high-density virtualization/storage projects mixed in with lower
> bandwidth gear, and sticking to one type of cable for everything would be
> convenient. I thought DAC had some distance limitations as well.
> This is all speculation though, I don't have any personal experience with
> the 10Gbase-T stuff either. I have no idea what to expect
> performance-wise.
> -A
> On Mon, Oct 1, 2012 at 12:58 PM, Jima <nanog at jima.tk> wrote:
>> > Does anyone here have experience running copper 10Gbase-T networks? It
>> > seems like the standard just died out. For us it would make a lot of
>> sense
>> > for our applications -- even if throughput and latency aren't as
>> great.
>> If
>> > anyone out there knows of any *copper* 10 gig-t switches (48 port?),
>> I'd
>> > be
>> > interested to hear your experiences. I can't seem to find any
>> high-density
>> > ones from major vendors.
>>  Is there something unique about your environment that wouldn't allow
>> you
>> to use 10gbit SFP+-based switches with DAC (Direct Attach Copper)
>> cables?
>>  Those seem fairly well supported.
>>      Jima