Optical SFP module in SFP+ port. Switch s1720

Flexible Networking Capability
The S1700 managed switch provides 10/100/1000BASE-T, 1000BASE-X, and 10GE SFP+ ports. It supports multiple interface types such as access, Trunk, and hybrid.
The S1700 managed switch provides swappable Small Form-Factor Pluggable (SFP) optical modules for GE optical fiber connections and swappable Small Form-Factor Pluggable plus (SFP+) optical modules for 10GE optical fiber connections. The length of optical fibers can be selected according to the transmission distance.
The S1700 managed switch supports the Spanning Tree Protocol (STP), Rapid Spanning Tree Protocol (RSTP), and Multiple Spanning Tree Protocol (MSTP) (only SNMP managed S1700) to prevent loops and provide rapid switchover.

You can refer to below Link : http://support.huawei.com/hedex/pages/EDOC1100037168AEH0823J/04/EDOC1100037168AEH0823J/04/resources/dc/dc_s17_managed_pd_004.html?ft=0&fe=10&hib=8.2.3.2&id=adc_s17_managed_pd_004&text=Product%20Features&docid=EDOC1100037168