[cisco-voip] OT 3560 LX/LH

[Scott Voll]

Thanks guys for the help.....

here is what I know.  Checked to make sure the ports are not err disable, or
spanning tree block.  Ports are showing not connected.  we have verifed the
SFP's at a different location and they work.  Switched out the
switches. with Copper SFP's they work also.

I'm taking a guess about distance but I would think it's longer then a mile
but less then two miles.

Single Mode all the way through.

We have switched the fiber strains (rx / tx) with out success.

the provider is coming out today with a Fiber tester to check the path all
the way through.  (hope they find something because I'm banging my head
pretty hard on this one)  fiber should be very easy..... and this is not :-(

Thanks guys

Scott

On Thu, Apr 16, 2009 at 6:06 AM, Madziarczyk, Jonathan <
JMad at cityofevanston.org> wrote:

>  I assume you’ve tried the basics:
>
>
>
> 1)      Made sure the send strand on side A goes into the receive port on
> side B and vice versa
>
> 2)      Checked the fiber with an optical tester to get visual
> confirmation that the fiber is working correctly (sometimes a chip or dirt
> on the end of the connector can prevent light from passing in only 1
> direction).
>
> 3)      Confirmed that it’s not a problem with both the SFPs and the
> 3560’s slots and that the SFPs are securely mounted inside the 3560.
>
> 4)      The ports on side A and B are correctly configured and not
> shutdown….and you’re waiting long enough that spanning-tree is actually
> ready to activate the ports (it’s probably not an issue with 3560s but some
> of the older switches would not indicate that the link was active until
> spanning tree was done with it’s uplink timer).
>
> 5)      Your fiber distances are within the recommended parameters.  Too
> far is obviously a problem, but too close is sometimes a bigger problem.
>
> 6)      Lastly do a “show interface” to make sure the port is not
> administratively down from some sort of violation (this doesn’t always show
> up in the port’s running config and may need a shut/no shut to resolve it).
>
>
>
> Beyond that, it may require some outside assistance.
>
>
>
> Let us know how it goes.
>
>
>
>
>
> *From:* cisco-voip-bounces at puck.nether.net [mailto:
> cisco-voip-bounces at puck.nether.net] *On Behalf Of *Scott Voll
> *Sent:* Wednesday, April 15, 2009 5:51 PM
> *To:* cisco-voip at puck.nether.net
> *Subject:* [cisco-voip] OT 3560 LX/LH
>
>
>
> I have two 3560's using LH sfp's with Single mode fiber.  but we just can't
> get the link to come up.
>
>
>
> we have switched fiber strains, we have changed sfps/ swtiches.  I'm kind
> of at a loss.
>
>
>
> any ideas?
>
>
>
> Scott
>
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