| 摘要 |
Electrical switching apparatus is described for connection to a wiring terminal block for a distribution frame, the wiring terminal block being connected to a plurality of telephone lines, cartridges inserted into the terminal block and a switching means in the cartridge for line-by-line switching, a power supply for powering the operation of the switching means being provided via one of the telephone lines connected to the wiring terminal block. The telephone line used for the power supply is a line of a telephone cable connected to the wiring terminal, whereby the other lines of the cable are for providing a telephone service and the line used for the power supply is not used for a telephone service. The power supply may be a remote power supply that is selectably connected to the telephone line used to provide the power supply by a test access matrix system. The test access matrix system is adapted to connect lines used for a telephone service selectably to a test head.
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