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

[Lane Patterson]

http://www.juniper.net/techpubs/en_US/release-independent/junos/topics/reference/specifications/optical-interface-support-ex-series.pdf

Read above.  Depends on type of optic.  TX "launch power" should be consistent, but RX "receive power" depends on the fiber distance, patch panels, and other factors that result in diminished light levels by time the light gets to the far end.

On Aug 2, 2011, at 2:30 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
> https://puck.nether.net/mailman/listinfo/juniper-nsp