[j-nsp] Power issues on 10Gig link

[Skeeve Stevens]

Hmmm.. Is there actually a way on Juniper to adjust the output power though?


...Skeeve

*Skeeve Stevens - *eintellego Networks Pty Ltd
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On Fri, Jan 24, 2014 at 12:32 PM, Tim Rayner <Tim.Rayner at aarnet.edu.au>wrote:

> Yes, by all means clean the fibre patches at both ends... both the patch
> leads, and the fibre at the back of the FOBOT.. And clean any intermediate
> patching.... And an OTDR test can identify anything along the path that is
> causing higher than expected loss....
>
> However, it may be that the easiest solution is to step up to 10GBase-ZR
> optics - which tend to have a power budget of around 23 dB, rather than the
> 10GBase-ER which typically have a power budget of ~ 15 dB.
>
> Tim.
>
> Tim Rayner
> Optical Engineer, AARNet Pty Ltd
> street address: Building 9, Banks Street, YARRALUMLA  ACT  2600
> postal address:  GPO Box 1559, CANBERRA   ACT   2601
> t. +61 2 6222 3575     f. +61 2 6222 3535     e. Tim.Rayner at aarnet.edu.au
> w. www.aarnet.edu.au
> Network Faults (24x7): 1300 APL NOC (1300 275 662) or noc at aarnet.edu.au
>
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> ________________________________________
> From: juniper-nsp [juniper-nsp-bounces at puck.nether.net] on behalf of
> Jared Mauch [jared at puck.nether.net]
> Sent: Friday, 24 January 2014 12:36 AM
> To: Ali Sumsam
> Cc: <juniper-nsp at puck.nether.net>
> Subject: Re: [j-nsp] Power issues on 10Gig link
>
> On Jan 23, 2014, at 8:14 AM, Ali Sumsam <ali+junipernsp at eintellego.net>
> wrote:
>
> > Hi All,
> >
> > I am using a SFP-10GBase-ER for my Cisco3750X for a 10gig link going to a
> > Juniper MX5-T router (10GE XFP)
> >
> >
> > I am receiving following logs on my Cisco3750X.
> >
> > %SFF8472-5-THRESHOLD_VIOLATION: Te1/1/2: Rx power low alarm; Operating
> > value: -21.3 dBm, Threshold value: -20.0 dBm.
> >
> > No logs on Juniper.
> >
> > Does this mean I have to increase the power on the interface?
> > Or is there anything else I need to look at?
> >
> > Following are the readings from my Juniper router.
> >
> > Laser rx power high alarm threshold       :  1.2589 mW / 1.00 dBm
> >    Laser rx power low alarm threshold        :  0.0158 mW / -18.01 dBm
> >    Laser rx power high warning threshold     :  1.0000 mW / 0.00 dBm
> >    Laser rx power low warning threshold      :  0.0199 mW / -17.01 dBm
> >
>
> You need to take a look at your span length and OTDR numbers.
>
> Was there recently a bend in the cable that caused this attenuation?
>
> Do the light levels improve when cleaned?
>
> If you replace the optic does the situation improve?
>
> Is the launch power the same in both directions, but just low on the RX
> side facing the Cisco?
>
> Finding the answers to these questions should resolve your alarms.
>
> - Jared
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