| 摘要 |
PURPOSE: A subscriber interface system in the full electronic switching system is provided to improve a control bus structure and a time switch to extend subscriber acceptability. CONSTITUTION: An analog subscriber interface unit(301) makes the analog subscriber of 8K into a PCM and multiplexes it into a required frame. A time switch link unit(302) connects the analog subscriber interface unit(301) to a space switch. A subscriber testing unit(307) tests the line of a subscriber side through the analog subscriber interface unit(301). A local service interface unit(309) provides a dial tone to a subscriber if the subscriber makes out hook-off through the analog subscriber interface unit(301). A ring generator(308) provides a ring to the subscriber through analog subscriber interface unit(301). A main processor(303) controls the whole functions of the access switching subsystem. A first local processor(304) is connected to the main processor(303) through a global bus and controls the subscriber testing unit(307). A second local processor(304) is connected to the main processor(303) through the global bus and controls the analog subscriber interface unit(301).
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