The purpose of this layer is to define the application layer protocol for the exchange of cellular subscriber information between networks.
这一层的主要用途是为了定义在网络间交换蜂窝网络用户信息的应用层协议。
2
A subscriber 's line connected to an exchange other than the one that would normally provide service at the relevant address, usually in accordance with the subscriber' s wishes.
一种连接到交换机的客户线路，这种交换机不是通常按照客户希望在相关通信处提供服务的交换机。
3
Making use of microcomputer techniques, the interface collects information from common control exchange HJ-921 and repeats called subscriber number to rural telephone exchange.