We need to have fiber connection between two sites (distance less than 300 meters from each other). Currently there is multi-mode fiber connected to old switches working nicely. Now we are updating our switches to 10Gb and trying to connect, but it doesn't work (no signal lights).
- Cable between two sites is installed in 2003, we're not sure if it's OM1 or OM3.
- Patch cables are OM1 (DELTACO LCSC-2M)
- Old SFP adapters are SFP-GE-SX-MM850-A (https://www.router-switch.com/pdf/esfp-ge-sx-mm850-datasheet.pdf) and new ones (not working) are J9150D (https://www.router-switch.com/pdf/j9150d-datasheet.pdf)
Best Answer
OM1 or OM3 makes a lot of difference. Please check https://en.wikipedia.org/wiki/Multi-mode_optical_fiber . You will see that OM1 cable can carry 10G for 33 meters while OM3 can carry it for 300 meters. OM3 application first started in 1998 but standardized in 2002. Most probably, your fiber is OM1 like your patch cords. Best practice would be
1- Check for markings on physical cable for information
2- Call a cabling company with a fiber tester. They will tell you everything about the infrastructure.