[j-nsp] Urgent advice needed...possible CWDM module conflict, can't keep link.

[Pierre-Yves Maunier]

If the optics support DOM (Digital Optic Monitoring), what is the received
signal power when you issue the following command ?

show interface diagnostics optic ge-X/X/X ?

Then compare it to the specs of the optic, maybe when you moved the optic
and fiber you added some attenuation of the fiber and maybe you were
already out of the specs and you were lucky it worked before.

On my side I never had issues with non-juniper optics in Juniper equipments
in general. And I would say, if it worked in a broke-ade, it should work in
a Juniper.

What I would do is to do a show interface diagnostics optic ge-X/X/X on
both side :

I'd calculate the attenuation between TX Site A and RX Site B and compare
it to the dark fibre calculated attenuation + the mux/demux insertion loss
+ 1 dB per patchcord (0.5 per connector)
I'd do the same with TX Site B and RX Site A to see if you have a physical
fiber problem.

If the optical levels are fine, it might be related to the SFPs.



2013/5/5 Morgan McLean <wrx230 at gmail.com>

> Hi all.
>
> I'm doing some work migrating from some brocade routers to a couple
> MX480's. The client currently uses CWDM between two sites, and the brocades
> handle the SFP's fine.
>
> We popped them into the MX480's and link came up and down a few times
> according to logs (though I could never catch it in an up state with show
> commands), the green light came on and off a bunch, but link never came. An
> EX4500 at the other end, which was previously interfacing with the brocade
> fine, showed tons of link up/ down events in the logs, much more than the
> MX showed.
>
> Is this a sign of an optic incompatibility on the MX side? There was enough
> signal for sure, and the brocades are able to operate with it so obviously
> it wouldn't be signal related.
>
> Any tips would be helpful.
>
> --
> Thanks,
> Morgan
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