Thus a base station of PHS is compatible with ISDN and is often connected directly to ISDN telephone exchange equipment e.g. a digital switch.

因此，小灵通基站也可与综合业务网系统相匹配并且经常作为综合业务网电话的交换设备。譬如，电子交换机。

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One day it is a frame relay switch, the next it is your ISDN router.

这一天是帧中继交换机，这是你们未来的ISDN路由器。

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With ISDN service, signaling that must be conveyed between the user station and the local switch is carried on a separate digital channel called the D channel.

与必须表达在用户驻地和本地开关之间的ISDN服务，发信号继续称D渠道的一条分开的数字通道。

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