Lane, while browsing the specifications of the optical modules listed in this "Optical Interface Support—EX 3200 and EX 4200 Switches.pdf" file:
http://www.juniper.net/techpubs/en_US/release-independent/junos/topics/reference/specifications/optical-interface-support-ex-series.pdf ..all the modules have minimum and maximum launch power which differ from each other quite a lot. What does this mean? Shouldn't the launch power be consistent? In addition, what is a "Maximum Receiver Sensitivity"? David, Keegan, thank you for explanation! In addition, there isn't some sort of connection between Rx power and Tx power, is there? I mean for example in case the received signal is low, the transmit signal of the SFP/XFP is increased automatically? As far as I know and as Lane confirmed, the Tx signal should be always consistent.. regards, martin 2011/8/3 Keegan Holley <keegan.hol...@sungard.com>: > 2011/8/2 Joel Jaeggli <joe...@bogus.com> > >> >> 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 <m4rtn...@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@puck.nether.net >> >> https://puck.nether.net/mailman/listinfo/juniper-nsp >> >> >> > >> > >> > >> > -- >> > Just my $.02, your mileage may vary, batteries not included, etc.... >> > >> > _______________________________________________ >> > juniper-nsp mailing list juniper-nsp@puck.nether.net >> > https://puck.nether.net/mailman/listinfo/juniper-nsp >> > >> >> >> _______________________________________________ >> juniper-nsp mailing list juniper-nsp@puck.nether.net >> https://puck.nether.net/mailman/listinfo/juniper-nsp >> >> > _______________________________________________ > juniper-nsp mailing list juniper-nsp@puck.nether.net > https://puck.nether.net/mailman/listinfo/juniper-nsp > _______________________________________________ juniper-nsp mailing list juniper-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/juniper-nsp