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

[Mack McBride]

The literature for the 6708 blade lists the X2-10GB-LX4 as an option for the 6500.
http://www.cisco.com/en/US/solutions/collateral/ns340/ns517/ns224/ns668/net_business_benefit0900aecd80534918.html

The release notes also list it as supported.
http://www.cisco.com/en/US/docs/switches/lan/catalyst6500/ios/12.2SX/release/notes/hardware.html#wp3051725

Unfortunately the IOS lists it as unsupported (SXH5 code).
Different code may list it differently.

You may be able to get it working by using 'service unsupported-transceiver' command.
I have not tried that.

Your receive power is fine on the link indicating the fiber is fine.
The modal bandwidth may not be sufficient for the distance or dispersion may be excessive for 10G as well.
You will need to do additional testing to determine that.

But my suspicion is less than full support for the LX4 transceiver in the code train.

The LRM may provide the support you need but is not specifically listed in the supported list.
I suspect it may have the same issue.
I have not tried those modules.

You may also want to investigate FN62840. Some models don't work right.
http://www.cisco.com/en/US/ts/fn/misc/FN62840.html

I am not sure if the documentation is inaccurate but our customers have run into this problem and the
solution was switching to LR type modules.

Your distance is too long for regular SR modules.

Mack


-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Cisco NSP
Sent: Wednesday, August 04, 2010 3:12 PM
To: cisco-nsp
Subject: Re: [c-nsp] 10GBase-LX4 and OM2 fibre -- MCP?

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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