[c-nsp] 10GBase-LX4 and OM2 fibre -- MCP?

[Cisco NSP]

Thanks for all the responses.

Unfortunately there is no single-mode fiber between the buildings. I'm much
more familiar with 10GBase-SR and  10GBase-LR and I would have liked to use
it instead. But we have to work with the current cabling.

I've checked the orientation of the TX/RX both ways and both didn't work. I
can try to clean the faces again, but the 1.9dB attenuation seems a good
indication  to me that the fibre itself is ok.


Mack, I'm not aware that the X2-LX4 interface was not supported on the 6500.
Do you have an url confirming this? FWIW, the optic is placed in a
VS-S720-10G-3C supervisor (port Te5/4).

Regards,
Dirk-Jan van Helmond





On Wed, Aug 4, 2010 at 6:40 PM, Justin M. Streiner
<streiner at cluebyfour.org>wrote:

> On Wed, 4 Aug 2010, Cisco NSP wrote:
>
>  Hi all,
>>
>> I'm not very fibre-savvy, so if anybody could help me, I'd very much
>> appreciate it!
>>
>> I have two Cisco 6500s about 250 meters apart in two separate buildings.
>> Between those two buildings I have OM2 grade fibre. and both Cisco have an
>> 10GBase-LX4 X2 interface.
>>
>
>  From what I recall, the recommended maximum distance on 10GBASE-LX4 on
>>
> <OM3 fiber is 300 meters.
>
>
>  When I measure the fibre end-to-end it has about 1,9dB attenuation in the
>> 1300nm spectrum but when I connect the fibre to the interface, I don't get
>> link-up.
>>
>
> That is well within the published link budget for the LX4 spec.  Are you
> sure that 1. both X2 modules are functional and 2. all of your jumpers and
> connectors are in good shape (clean end faces, no kinks/micro-bends), etc?
>
>
>  A little troubleshooting pointed me to mode conditioning patches (a piece
>> of
>> SM and MM welded together) but I find it very hard to believe that this
>> patch will solve my problem.
>>
>
> A mode-conditioning patch can extend the distance and reduce the dispersion
> penalty you pay on multimode fiber by admitting only one mode of light into
> the fiber from the transmit side of the optics at each end.
>
> Do you have any singlemode fiber between the buildings, or do you just have
> OM2 grade multimode?
>
> jms
>
>
>>
>> Before I invest 800$ for 2 patch-fibers, Is this the way I should go, or
>> am
>> I overlooking anything?
>>
>>
>> Thanks in advance,
>> Dirk-Jan van Helmond
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