single mode should also be fine... FWIW... here is what to check..
Check the receive sensitivity of the SFP in use.. and make sure that the received signal is at the very least 4db higher good range is 6db higher than rx sensitivity., 2nd thing to check is .. How much light you are Tx and how much you are Rx. check on both sides, and you difference is the loss in cable + Connector... (TX - RX) on one side should be pretty similar to (TX-RX) of the other side... otherwise you have some cable or connector issue. (dirty or not seated properly or possible bad). When you see TX in the +1 or higher range or you start seeing RX in the range of -2 or higher then you need attenuators to bring the signal down, otherwise you are going to burn out the optics... (FYI.. the attenuation is normally put in on the RX side... ) There are some crazy carriers who sometimes use ZX Sfp's to hand off fiber connections inside the data center.. (these are high power optics designed to to 60-80km, they can put up to +5 or higher power !). Regards. Faisal Imtiaz Snappy Internet & Telecom 7266 SW 48 Street Miami, FL 33155 Tel: 305 663 5518 x 232 Help-desk: (305)663-5518 Option 2 or Email: supp...@snappytelecom.net > From: "Chris Wright" <ch...@velociter.net> > To: af@afmug.com > Sent: Thursday, October 20, 2016 5:12:55 PM > Subject: Re: [AFMUG] CRS with sfp lockup > Whoops sorry to throw you off the trail, mine are single mode. Need more > coffee. > Chris Wright > Network Administrator > From: Af [mailto:af-boun...@afmug.com] On Behalf Of Adam Moffett > Sent: Thursday, October 20, 2016 1:19 PM > To: af@afmug.com > Subject: Re: [AFMUG] CRS with sfp lockup > My Trango issue is also with Multimode....not sure if that's a coincidence. > As reported by the CCR, tx is -7dbm, rx is -6dbm. > (Eric Kuhnke will now scold me and say I should be using SM, but the SFP's > with > industrial temperature ranges are still a lot cheaper MM. And it's only going > a > few hundred feet.) > ------ Original Message ------ > From: "Chris Wright" < ch...@velociter.net > > To: " af@afmug.com " < af@afmug.com > > Sent: 10/20/2016 4:09:18 PM > Subject: Re: [AFMUG] CRS with sfp lockup >> Tx: -6.250 dBm >> Rx: -9.470 dBm >> Multimode >> Chris Wright >> Network Administrator >> From: Af [mailto: af-boun...@afmug.com ] On Behalf Of Faisal Imtiaz >> Sent: Thursday, October 20, 2016 12:40 PM >> To: af@afmug.com >> Subject: Re: [AFMUG] CRS with sfp lockup >> What are your light levels ? >> SM or MM ? >> Faisal Imtiaz >> Snappy Internet & Telecom >> 7266 SW 48 Street >> Miami, FL 33155 >> Tel: 305 663 5518 x 232 >> Help-desk: (305)663-5518 Option 2 or Email: supp...@snappytelecom.net >>> From: "Chris Wright" < ch...@velociter.net > >>> To: af@afmug.com >>> Sent: Thursday, October 20, 2016 3:30:03 PM >>> Subject: Re: [AFMUG] CRS with sfp lockup >>> I’ve seen that same issue as you describe it between >>> CCR1036/CCR1016/CCR1009 and >>> Netonix switches. Tik says fiber is up at 1Gbps but no rx traffic. Netonix >>> detects the cable is plugged in but can’t get any traffic through. Toggling >>> SFP >>> to inactive/active usually fixes. Used Fiberstore Generic, Mikrotik, and HP >>> SFPs in the Mikrotik – no improvements one over the other. Netonix seems to >>> prefer HP SFPs. >>> Doing things like turning flow control on/off or changing speed negotiation >>> settings on the Mikrotik can induce this problem * sometimes * - depends on >>> what mood it’s in. No rhyme or reason when it fails at other times – >>> toggling >>> usually fixes it though. >>> Chris Wright >>> Network Administrator >>> From: Af [ mailto:af-boun...@afmug.com ] On Behalf Of Adam Moffett >>> Sent: Thursday, October 20, 2016 12:19 PM >>> To: af@afmug.com >>> Subject: Re: [AFMUG] CRS with sfp lockup >>> I'm not saying this is the same problem....but I have a situation where a >>> Trango >>> Apex Lynx loses link to a CCR 1036. The SFP interface on the router says >>> there's link, but the SFP interface on the Trango says there isn't. The >>> problem >>> (in my case) occurs any time the Trango loses power. I can restore service >>> by >>> rebooting the CCR, unplugging and reconnecting the fiber cable, or disabling >>> and re-enabling the SFP interface. In this case I didn't have a good >>> picture of >>> what was happening at first because when it was happening I didn't have >>> remote >>> access to see the condition of everything. >>> The Apex Lynx has the JDSU SFP module sold by Trango. I've duplicated the >>> problem with 4 different SFP's in the CCR (Mikrotik brand, Maxxwave, JDSU, >>> and >>> Finisar), but I haven't tried changing the SFP in the Trango. I don't know >>> how >>> common this issue is....it only became apparent after a UPS failed. >>> ------ Original Message ------ >>> From: "TJ Trout" < t...@voltbb.com > >>> To: af@afmug.com >>> Sent: 10/20/2016 2:30:29 PM >>> Subject: [AFMUG] CRS with sfp lockup >>>> I have a mikrotik CRS210 with a non-mikrotik sfp which locked up last >>>> night, Not >>>> sure if it was the CRS or the sfp... >>>> Anyone encountered this and have a solution?
