They both are. -Inf just means it's below the RX detectable level. Ambient light can hit the RX and get you some light level measurement even when not connected to a TX. If you've a black solid plug covering the optic and still getting -20dBm that's kind of odd though.
On Thursday, September 17, 2015, Bill Blackford <[email protected]> wrote: > I'm seeing an inconsistent behavior. I have two Juniper branded XFP (LR) > made by Sumitomo inserted into a chassis, but are not configured nor > connected. Looking at the light levels, I see > > Laser rx power 0.0098 mW / -20.09 dBm and similar for the > other. > > Now, other optics I have in the same chassis, also not configured nor > connected, show > > Laser rx power 0.0000 mW / -Inf dBm > > I would suspect the second behavior (that of the non-Sumitomo's) should be > correct, expected. > > My question is, which of these behaviors is correct and does it matter? > > Thank you, > > > -- > Bill Blackford > > Logged into reality and abusing my sudo privileges..... > _______________________________________________ > juniper-nsp mailing list [email protected] <javascript:;> > https://puck.nether.net/mailman/listinfo/juniper-nsp > -- "Genius might be described as a supreme capacity for getting its possessors into trouble of all kinds." -- Samuel Butler _______________________________________________ juniper-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/juniper-nsp
