这些光纤可以应用在新型电话通讯系统。
These optical fibres may be used for new sorts of telephony.
电话通讯系统采用虚拟交换局方式，中继线60条，展馆内外采用ic卡。
With 60 junction lines, the telephone communication system will operate by virtual exchange. The Exhibition Hall is equipped with IC telephones.
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.
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