2011/8/2 Joel Jaeggli <[email protected]> > > 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 > > Yea I agree. The -15 is a bit low unless it's is at the end of a really long, low-quality fiber run I'd clean it and or replace the XFP. It's blasting out at +1 and receiving much less, there could also be a mismatch of some sort. There are lots of ways to mismatch optics and cabling and still get link.
> 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 <[email protected]> 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 [email protected] > >> https://puck.nether.net/mailman/listinfo/juniper-nsp > >> > > > > > > > > -- > > Just my $.02, your mileage may vary, batteries not included, etc.... > > > > _______________________________________________ > > juniper-nsp mailing list [email protected] > > https://puck.nether.net/mailman/listinfo/juniper-nsp > > > > > _______________________________________________ > juniper-nsp mailing list [email protected] > https://puck.nether.net/mailman/listinfo/juniper-nsp > > _______________________________________________ juniper-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/juniper-nsp
