A unitary tray for operably supporting a fiber-optic module is disclosed. The tray includes a guide base and guide rails that define a central channel sized to accommodate the fiber-optic module. The fiber-optic module can be slid into a central module position from the back or the front of the tray, and then locked in the central module position. Opposing unitary side guides with slotted channels can be used to form a drawer that holds one or more of the trays. The drawers can be used to form fiber-optic equipment such as an interconnection unit that supports the modules and that allows for conveniently making multiple optical fiber interconnections.