Abstract: An interface housing which has a fiber spool to store slack in the fiber trunks and a card cage to interface the trunk mounted on the door of the housing. The door is hinged on one side of the housing so that, when the door swings open, the entire card cage and fiber spool are clear of the housing and readily accessible and releases the PCB lock. A ribbon connector connects the back plane of the card cage to an interface terminal board on the wall of the housing to which external wire-wrap and/or RJ48X connections may be made. Backup batteries in a tray are disposed along the bottom of the housing and secured in place with a cover. When the housing door swings shut, the fiber optic spool fits in front of back-up batteries in the tray and the card cage fits over the batteries.