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现在,许多用户电报交换网络,公众电报交换网络和专用网络等广泛采用±24V、±4mA的双流接口.T_(1000)型电传打字机没有这种接口.所以,不能直接上线使用.下面是在±24V、±4mA双工双流线路上怎样实现用T_(1000)电传打字机正常发报. 我们知道,T_(1000)型在双工状态下的线路电压和电流分别为±48V和±20mA,直接上线会损坏网络上对方的设备.所以,我们必须对T_(1000)型电传打字机发送端的信号降压、限流.如图所示:
Nowadays, dual-stream interfaces of ± 24V, ± 4mA are widely used in many subscriber telephony networks, public switched telephony networks and private networks, etc. The TT 1000 type teletype machine does not have such an interface and therefore can not be used directly. ± 1000mA, ± 4mA, ± 4mA Duplex double-stream line How to realize the normal transmission by T_ (1000) teletypewriter We know that the line voltage and current of T_ (1000) type are ± 48V and ± 20mA respectively in duplex mode, Direct on-line damage to the other side of the network equipment, so we must T type (1000) teletypewriter transmitter signal step-down, current limiting.As shown: