[c-nsp] 10GE sanity check

[Justin M. Streiner]

On Sun, 18 May 2008, Tassos Chatzithomaoglou wrote:

> I had (accidentally) SFP 1000BaseLX/LH and 1000BaseZX talk to each other through SMF, regardless of
> their different wavelengths (!).
>
> Although everything worked fine (passing traffic through) for some minutes, i replaced one of the
> SFPs in order to be sure i won't meet any problems in the future.

In a case like that, you could see problems over time because the laser in 
the ZX SFP could overload the receiver in the LX one, depending on the 
cable distance between the two units.

jms

> Azher Mughal wrote on 18/5/2008 5:48 πμ:
>> It should not work as both have different encoding and no of wavelengths.
>>
>> http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps708/prod_white_paper0900aecd802a648b.html
>>
>> -Azher
>>
>> Justin M. Streiner wrote:
>>> I'm just looking for a quick sanity check here on 10GE optics.
>>>
>>> A 10GBASE-LX4 xenpak or X2 module will not talk to a 10GBASE-LR module,
>>> correct?  I'd test this assertion in my lab, but I don't have a spare LR
>>> module at the moment.  From what I've read of the coding and transmission
>>> specs for both types of optics, they wouldn't seem to be compatible, but I
>>> could be wrong :)  CCO doesn't seem to have much info on module-to-module
>>> compatibility, probably because they assume the optics will be the same at
>>> both ends, but vendor differences in this case make that impossible.
>>>
>>> Thanks in advance
>>> jms
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