Abstract: A communication system comprising at least one communication unit. Each communication unit includes an interface port, a first-digital-subscriber-line port, a second-digital-subscriber-line port, and a central processing unit. The central processing unit is communicatively coupled to receive information indicative of the operability of the first-digital-subscriber-line port and the second-digital-subscriber-line port. The at least one communication unit is implemented on the physical layer in single-pair mode. The at least one communication unit is configured to switch from sending timeslots in dual-pair mode to sending timeslots in 1+1 protection mode when communication on one of the first-digital-subscriber-line port and the second-digital-subscriber-line port fails.

Abstract: A self-regulating permanent magnet device has a first rotor segment and second rotor segment, each supporting a set of permanent magnets, wherein the position of the second rotor segment relative to the first rotor segment is modified based on the speed of the self-regulating permanent magnet device. By modifying the position of the second rotor segment relative to the first rotor segment, the alignment between their respective sets of permanent magnets, and therefore, the electromotive force (emf) generated in the stator coils is regulated. The position of the second rotor segment is defined by the connection of a torsion spring between the first rotor segment and second rotor segment and a reactionary torque device connected to the second rotor segment. The torsion spring creates a spring force that acts to maintain the alignment between the first rotor segment and the second rotor segment.

Abstract: A dynamoelectric machine (10) includes a stator (12), a rotor (14), a bearing (16) supporting the rotor (14) for rotation about an axis (20), and a housing (22). The housing (22) is manufactured by first forming a unitary metallic extrusion (24) including a radially innermost nominally cylindrical member (26), a radially outermost nominally cylindrical member (28), a central nominally cylindrical member (30) spaced radially between the innermost and outermost members (26, 28), a set of spokes (32) connecting the innermost and central cylindrical members (26, 30) together, a set of arcuate cooling passages (34), a set of spokes (36) connecting the central outermost cylindrical members (30, 28) together, and a set of arcuate cooling passages (38). A set of fins (40) are also formed during the extrusion process extending radially from the central cylindrical member (30) into the cooling passages (38).