When connecting directly to a service provider, or to a device such as a CSU/DSU that will perform signal clocking, the router is a DTE and needs a DTE serial cable.

• 当对一个服务供给者直接连接的时候，或者例如是CSU／DSU的一个装置时,以致于完成信号时钟，路由器是DTE并且需要DTE序列电缆。