Zy XEL SFP-SX-D 1000 Base SX SFP Module Zy XEL's Small Form-factor Pluggable (SFP) transceiver family provides performance & flexibility with full duplex Gigabit speeds & hot-pluggable into Gigabit Ethernet port. Zy XEL's SFP transceiver's compact design provides high port density. Zy XEL's SFP transceiver family is compliant with IEEE 802.3z & SFP MSA allowing easy interoperability with all standard compliance devices from different vendors.