[SGSW-24240 series] Why won’t the SFP connection get a link?

Solution:
1. Main possible reason: Recognized NOT SFP modules.

2. The SGSW-24240 series supports Dual-Speed SFP by auto-detection technology:
a. When the SFP module plug-in, the SGSW-24240 read the module information that was burn-in the SFP transceiver, to check the Speed and type of the SFP transceiver.
b. Then SGSW-24240 auto set link speed mode on the SFP port to be 1000Mbps/Full-Duplex or 100Mbps/Full Duplex base on detects result.

3. If the SFP module was not writing in the speed, wavelength and etc. information, the SGSW-24240 will identify it as UNKNOW SFP and set the link speed to 1000Mbps/Full-Duplex.
- But if it is 100Base-FX SFP without wrote in SFP speed and the SGSW-24240 set this SFP slots to 1000Mbps/Full-Duplex, then the link will failed.
- Users have to set the link speed of the SFP slot to 100Mbps/Full-Duplex manually.

4. If the SFP module was writing in wrong speed, wavelength and etc. information, the SGSW-24240 will set the link speed of the SFP slot based on detects result.
- But if it is 100Base-FX SFP with wrote in SFP speed to 1000Mbps, and the SGSW-24240 set this SFP slots to 100Mbps/Full-Duplex, then the link will failed.
- Users have to set the link speed of the SFP slot to 100Mbps/Full-Duplex manually.