Abstract: A communications system featuring a remote security server is provided. The system allows the validation of requests for access to a communications network to be performed in a centralized security server. The use of a security server allows security features to be implemented, without the need to distribute a security algorithm to individual client devices. In addition, changes to the security algorithm can easily be made, because such changes need only be made in the security server itself, and in the communications server to which access is desired. The present invention is particularly useful in connection with communication services provided as part of a private branch exchange.

Abstract: A trailer refrigeration unit has a pivotally mounted engine driven generator unit and a pivotally mounted compressor unit that combine to form a structure that minimizes the spatial "real estate" occupied by the refrigeration unit. A single common rotatable shaft operates the integrally mounted engine and generator to form a unitary unit. The engine driven generator and compressor units can be pivoted out of the refrigeration unit frame to a fully serviceable position that provides easy access to the rear portions of the engine, generator and compressor units without requiring removal of those units from the refrigeration unit.