Abstract: An aircraft fuselage sidewall may include an aircraft sidewall volume and a flow controller. The aircraft sidewall volume may be delineated by an aircraft skin forming an outboard boundary of the aircraft sidewall volume, a passenger cabin sidewall forming an inboard boundary of the aircraft sidewall volume and fuselage frame structures forming axial boundaries of the aircraft sidewall volume. The flow controller may be positioned at a portion of the aircraft sidewall volume to selectably control air flow through the aircraft sidewall volume.

Abstract: An aircraft fuselage sidewall may include an aircraft sidewall volume and a flow controller. The aircraft sidewall volume may be delineated by an aircraft skin forming an outboard boundary of the aircraft sidewall volume, a passenger cabin sidewall forming an inboard boundary of the aircraft sidewall volume and fuselage frame structures forming axial boundaries of the aircraft sidewall volume. The flow controller may be positioned at a portion of the aircraft sidewall volume to selectably control air flow through the aircraft sidewall volume.

Abstract: A system and method overlay of advanced digital technology onto the installed feeder and distribution cable portion of the outside plant to obtain additional voice circuits. Interface equipment proximate existing drop wire interface points converts digitized voice circuits back to analog signaling together with appropriate POTS signaling and power connections. The interface equipment is centrally powered along with other portions of the outside plant so that operation is independent of customer and commercial power sources. Power may be provided by batteries located at the associated central office or by locally provisioned, non-interruptible, battery-backed-up power sources. The existing switched telephone network includes central offices connected by interoffice facility trunks, each central office providing service to nearby subscribers connected by local loop facilities.