single mode multi mode

[bluesea2010]

Hi

When choosing fiber cable  apart from distance what are the specifications do I really  need to look 

Thanks

[Leo Laohoo]

1. Standards:  OS1 or OS2.  OM1/2 or OM3/4. 
2. How many strands/pairs vs how many strands/pairs terminated.  

[balaji.bandi]

Also depends on what SFP optics you have (already to use)

https://www.cisco.com/c/en/us/td/docs/interfaces_modules/transceiver_modules/installation/note/78_15160.html

[Reza Sharifi]

Hi,

If you are installing new Multimode fiber, you want to make sure you are installing OM5 if not OM4, as these are the latest and the greatest. For SM, it is pretty much OS2.

HTH

[Joseph W. Doherty]

Perhaps also what's "better" for future bandwidth upgrades.  (Because cabling plant installation is often as much if not more expensive than optical module upgrades.)