通过调制解调器或声耦合器连接电话线路而获取计算机内资料的一种非法手段。
An illegal means of accessing computer data via a telephone link using a modem or acoustic coupler.
本产品为本质安全型，由电话机和耦合器两部分组成。
This product is of secure type consisting of telephone set and coupler,.
话机与关联设备HOB-1型防爆耦合器配套， ● 户内、户外 与交换机连接，组成防爆电话通讯系统。
The telephone is used with the explosion-proof coupling of HOB-1 and connect to program controlled switch to form explosion-proof communication system.
本产品为本质安全型，由电话机和耦合器两部分组成。
This product is a safe type of essence, made up of telephone and two parts of coupling device.
本产品为本质安全型，由电话机和耦合器两部分组成。
This product is a safe type of essence, made up of telephone and two parts of coupling device.
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