Abstract: An outlet (1) includes a plurality of blade receiving members (13) adapted in use to be connected respectively to a plurality of DC supply lines (Wdc1 and Wdc2), and to be connected respectively to a plurality of blades (21) of an outlet plug (2). The outlet (1) is configured to supply DC power from the plurality of the DC supply lines (Wdc1 and Wdc2) to the outlet plug (2) via the plurality of the blade receiving members (13). The outlet (1) includes a wiring detecting means (3). The wiring detecting means (3) is configured to determine proper wiring when the plurality of the DC supply lines is connected respectively to the plurality of the blade receiving members at proper polarity, and to determine improper wiring when the plurality of the DC supply lines is connected respectively to the plurality of the blade receiving members at improper polarity.

Abstract: The information outlet (1) includes a housing (10) shaped into a rectangular box. The housing (10) is integrally formed on its front surface with a rectangular boss portion (11). The boss portion 11 is formed in its center with a cylindrical recess (16). An inner terminal receiving member (14) and outer terminal receiving member (15) are disposed inside the recess (16). Applied between the inner terminal receiving member (14) and outer terminal receiving member (15) is DC voltage where a video signal is superimposed. Interposed between the inner terminal receiving member (14) and outer terminal receiving member (15) is a light emitting diode which emits light upon being applied DC voltage to. The light emitted from the light emitting diode is transmitted to an outside of the housing (10) via a translucency window portion (13).

Abstract: An outlet (1) includes a plurality of blade receiving members (13) adapted in use to be connected respectively to a plurality of DC supply lines (Wdc1 and Wdc2), and to be connected respectively to a plurality of blades (21) of an outlet plug (2). The outlet (1) is configured to supply DC power from the plurality of the DC supply lines (Wdc1 and Wdc2) to the outlet plug (2) via the plurality of the blade receiving members (13). The outlet (1) includes a wiring detecting means (3). The wiring detecting means (3) is configured to determine proper wiring when the plurality of the DC supply lines is connected respectively to the plurality of the blade receiving members at proper polarity, and to determine improper wiring when the plurality of the DC supply lines is connected respectively to the plurality of the blade receiving members at improper polarity.

Abstract: A wireless transmission system includes a plurality of terminal units, a specific one of which is provided with a transmission/receiving circuit that transmits a reference signal of a local oscillation frequency, while all others of which are provided respectively with a transmission/receiving circuit that prepares, on the basis of the reference signal received, a local oscillation frequency signal for frequency conversion of transmitting/receiving frequency signal and intermediate frequency signal, to thereby realize the system at lower costs even when a high local oscillation frequency is employed.