What This Dust Cap Covers
The TE Connectivity 1888810-2 is a dust cap, specifically a cap or cover, designed to protect the optical interface of XFP and QSFP connectors when they are unmated. It keeps dust, debris, and physical contaminants off the ferrule and alignment sleeve, which is the most common cause of insertion loss degradation in a fiber link. The cap fits over the connector's front end and stays in place during handling, storage, or shipping. Supplied in bulk packaging, it is a straightforward consumable accessory for any fiber-optic transceiver bay or patch panel where those connector types are used.
This dust cap is listed for use with XFP and QSFP connectors. That covers the standard XFP form factor and the QSFP family that share the same front-panel opening and latching interface.