Hmm... this is rather strange... In future keep some of these troubleshooting tips in mind..
1. You have to make sure that type of SFP & (Wavelength) Matches.. i.e. MM --> MM SFM --> SMF , SMF can be 1310 or 1550 make sure both sides match 2. Make sure light is reaching both sides... use a light meter (if you don't have one, consider buying one .. approx $50 from Fiberstore.com) if you don't have a light meter, you can use use a far side loop back (simply connect the Rx side to Tx side on the far side) you can use this method to test each side coming up individually. 3. Make sure that if you are using SFP of correct ratings (i.e. 1gig in the 1gig ports) Not all SFP+ (10G) will accept 1G SFP's. 4. Make sure the Duplex Settings match on each side... for Cisco, it is best to hard code each side. 5. When using SMF SFP's, it is possible to over load the receiver, i.e. getting too much light... and not have link.... in such cases it is ideal to use a 'pad' or attenuator. This is the reason why it is important to have a light meter... Having said that... I have yet to come across a situation where one SFP will not connect to another SFP as long as all of the other above listed reason are not the cause of the problem.. If you are worried about testing compatibility.... easiest thing to do is use a fiber patch cord (LC-LC) to create yourself a loop back cable (you can add a 3db attenuator if you like), plug in the SFP in your device, make sure that the device will see the SFP, connect the loop back cable and the link should come up... (if you need to make field attenuator... do some googling on how to wrap fiber cable strand tightly around a #2 pencil to create one) :) 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: [email protected] ----- Original Message ----- > From: "Jason McKemie" <[email protected]> > To: [email protected] > Sent: Thursday, July 30, 2015 11:43:43 PM > Subject: Re: [AFMUG] Tik - Cisco SFP > I tried to get a couple mikrotiks to talk to a Cisco nexus switch at the > other end of some dark fiber. We couldn't get anything to work - showed as > up on my end, but down on the Cisco end. Wound up dropping a Cisco router in > place of the tik and it came right up. > On Thursday, July 30, 2015, Tyler Treat < [email protected] > > wrote: > > Does anyone have a recommended SFP for going from a 2011 to a Cisco Switch? > > Anything special to be aware of? > > > Thanks > > > Tyler >
