Abstract: The built-in cooling system (12) is located centrally in the cabinet enclosure (10) and includes at least one plenum (22) having an interior chamber mounted in a roof area (24) of the enclosure (10). The plenum (22) is in fluid isolation from the air within the enclosure (10), but has at least one vent (66) being in fluid association with the ambient air outside of the enclosure (10). The plenum (22) is coupled to a heat exchanger column (20) located centrally in the enclosure (10) with an internal air passageway (78) with intake and exit ports (70, 72), and having an external air passageway (76) with intake and exit ports. The external air passageway (76) is in fluid association with the chamber of the plenum (22). At least one heat sink (40) is mounted above the electronic equipment in the plenum (22) between the external air passageway exit port (48) and the vent (66) of the plenum (22).

Abstract: A retractable battery tray includes a supporting structure, a tray assembly, and a heating device. The support structure of the battery tray generally spans and attaches to two spaced apart supporting base structures of a telecommunications equipment cabinet and supports the tray assembly therebetween. One or more batteries are supported and carried on a tray member of the tray assembly and vertically ganged heavy-duty horizontally extending slide rails movably attach the tray member to the support structure. A closure panel attaches to the spaced apart supporting base structures to retainably conceal the tray in a retracted position. Positioned in the tray underneath the battery, the heating device includes a thin sheet-like heating pad sandwiched between a protective plate therebelow and an insulating sheet thereabove. The insulating sheet retains heat from the heating pad within the tray. The protective plate prevents the batteries from damaging the heating pad.