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

[Pierre-Yves Maunier]

It looks like you're using SFP+ ? Are you sure it's CWDM ? Usually 10G
modules are DWDM because the wavelengths around 1550nm are better in terms
of attenuation.

Can you give the brand and model of the WDM optics you're using so we can
check -9.6 dBm in reception is within the acceptable power range for
reception.




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

> This is what the optic diagnostic looked like last night.
>
> Physical interface: xe-2/0/1
>     Laser bias current                        :  68.304 mA
>     Laser output power                        :  1.1930 mW / 0.77 dBm
>     Module temperature                        :  25 degrees C / 77 degrees
> F
>     Module voltage                            :  3.2660 V
>     Receiver signal average optical power     :  0.1097 mW / -9.60 dBm
>
> I'll have to check on what the calculated attenuation (Haven't done this
> before), and what the specs of the optic are. I wasn't able to run this at
> the EX4500 side because we lost connectivity to the site. But, I'm guessing
> the problem is on the MX side.
>
> Thanks,
> Morgan
>
>
> On Sun, May 5, 2013 at 3:58 AM, Pierre-Yves Maunier <j-nsp at maunier.org>wrote:
>
>> 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
>>> _______________________________________________
>>> juniper-nsp mailing list juniper-nsp at puck.nether.net
>>> https://puck.nether.net/mailman/listinfo/juniper-nsp
>>>
>>
>>
>
>
> --
> Thanks,
> Morgan
>