Abstract: In one embodiment systems and methods are utilized that eliminate synchronization between cycles of a repetitive communication network quality test. This is accomplished by time-shifting each sample transmission to compensate for the time shift due to communication network delay and asymmetrical operation of network testers. In one embodiment, a dual-tone multi-frequency (DTMF) stamped sample signal is used to obtain an accounting of the time-shift that is necessary for each cycle. Once the necessary time-shift is determined, a time-shift alignment calibration (TSAC) and real-time auto-TSAC is used to implement continuous voice/video quality evaluations.

Abstract: An Automatic Measurement and Announcement Voice Quality Tester (“AMA-VQT”) measures the voice quality of a communication link from a customer premises equipment (“CPE”) through a Network under Test to the AMA-VQT. The AMA-VQT may include a Communication Module in signal communication with the CPE through the Network under Test, an Authorization Module in signal communication with the Communication Module, an Instruction Announcement and DTMF Input Recognition Module in signal communication with the Communication Module and Authorization Module, a Voice Composing and Announcement Module in signal communication with the Communication Module and a Voice Quality Measurement Module in signal communication with the Authorization Module, Instruction Announcement and DTMF Input Recognition Module, and Voice Composing and Announcement Module, where the Voice Quality Measurement Module is adapted to measure the voice quality of the communication link.

Abstract: A computer enclosure includes a cage with a pair of brackets fixed therein for rotatably supporting a mother board tray to which a mother board is fixed. The cage includes a front panel, a rear panel, a top panel and a bottom panel forming a receiving space for receiving the mother board tray. The brackets support shafts that are rotatably received in bores defined in the mother board tray allowing the mother board to be mounted to and/or removed from the mother board tray at a position outside the cage thereby reducing the size of the cage and thus facilitating miniaturization of the computer enclosure.