检查，测试和维修用户住所的有线电视和卫星电视信号和相关设备。
Inspect, test and repair cable and satellite television signals and associated equipment at subscriber's premises.
ARINC 429数据总线在航空电子系统通讯领域有着广泛应用，要对航空通讯设备进行维修，就一定需要产生ARINC 429信号。
ARINC429 data bus is widely used in avigation electronic system communication. The ARINC429 signals are needed for the repairs of avigation communicate equipments.
我国的铁路区间信号设备采用集中放置于室内的形式，这对系统的维护和维修提供了很大的方便。
In China, the train section signal facilities are integrated to put them in the house in order to facilitate the repair and maintenance.
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