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我省绝大多数县局都实现了自动电话,现已处于扩容或即将扩容阶段,而县局市话交换设备使用着相当数量的HJ921型纵横制自动电话交换机,这些交换机市话号长基本都是4位制或5位制。其长途全自动性能不完善,农话自动性能基本不具备,农话半自动性能不完善,相应按长途电话费率计费的功能不具备,按农村电话费率计费的功能不完善,无汇接功能,无农话出口方向等缺点。所有这些都是HJ921型交换机进本地网的障碍。对于目前已扩容或因资金困难,又必须扩容而购买了价格低廉的二手设备HJ921型交换机,也可根据业务和电信网络发展的需要,
The vast majority of counties in our province have implemented automatic telephone, is now in expansion or expansion stage, while the county telephone exchange equipment using a considerable number of HJ921 vertical automatic telephone exchange, telephone number of these switches are basically 4 Bit system or 5-bit system. Its long-distance fully automatic performance is not perfect, the automatic performance of agricultural basic does not have, the semi-automatic performance of agricultural non-perfect, the corresponding long-distance telephone rates do not have the function of billing, according to the rural telephone rates feature an imperfect billing, Then function, there is no shortcoming such as agricultural export direction. All of these are obstacles to the HJ921 switch into the local area network. For the current expansion has been due to financial difficulties, but also to expand the purchase of low-cost second-hand equipment HJ921 switch, but also can be business and telecommunications network development needs,