[j-nsp] acceptable/good laser receive power in case of different interfaces

[Joel Jaeggli]

if these are sr multimode optics, the -15 number is low the -7 number is marginal and everything else is decent.

either the -15 one is quite long ( for sr) or needs to be replugged/cleaned/reterminated

On Aug 2, 2011, at 2:53 PM, chip wrote:

> Depending on whose optics you're using there should be a data sheet
> that shows the acceptable Tx/Rx levels for each type available from
> your vendor.  I can't seem to locate a document for Juniper at the
> moment.  But I assume they shouldn't be that far off from Cisco stuff.
> For example, here's a data sheet for the XENPAK module:
> 
> http://www.cisco.com/en/US/prod/collateral/modules/ps2797/ps5138/product_data_sheet09186a008007cd00_ps5455_Products_Data_Sheet.html
> 
> Check Table-2.
> 
> As far as I know, an optic will output power within a specified range
> as according to what type it is, SR, LR, ER, ZR, etc...
> 
> Hope that helps a bit.
> 
> 
> On Tue, Aug 2, 2011 at 5:26 PM, Martin T <m4rtntns at gmail.com> wrote:
>> What is the acceptable Rx power in case of SFP/XFP? For example, here
>> are XFP Tx and Rx signals from six FXP's:
>> 
>> 1:
>> Laser output power                        :  1.2920 mW / 1.11 dBm
>> Laser rx power                            :  0.0285 mW / -15.45 dBm
>> 
>> 2:
>> Laser output power                        :  0.6420 mW / -1.92 dBm
>> Laser rx power                            :  0.3054 mW / -5.15 dBm
>> 
>> 3:
>> Laser output power                        :  0.4230 mW / -3.74 dBm
>> Laser rx power                            :  0.5092 mW / -2.93 dBm
>> 
>> 4:
>> Laser output power                        :  0.4180 mW / -3.79 dBm
>> Laser rx power                            :  0.4208 mW / -3.76 dBm
>> 
>> 5:
>> Laser output power                        :  1.0920 mW / 0.38 dBm
>> Laser rx power                            :  0.1801 mW / -7.44 dBm
>> 
>> 6:
>> Laser output power                        :  0.7680 mW / -1.15 dBm
>> Laser rx power                            :  0.3337 mW / -4.77 dBm
>> 
>> 
>> Is there some sort of pattern? It looks like if the Rx signal is
>> lower, the Tx is higher? And what can one consider a decent Rx laser
>> power level?
>> 
>> 
>> regards,
>> martin
>> _______________________________________________
>> juniper-nsp mailing list juniper-nsp at puck.nether.net
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>> 
> 
> 
> 
> -- 
> Just my $.02, your mileage may vary,  batteries not included, etc....
> 
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