The router must be able to move a stream of bits from one type of service, such as ISDN, to another, such as a T1, and change the data link encapsulation from PPP to Frame Relay.
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- 路由器必须能够从一种服务型态;例如ISDN;移动位元流到另一种服务型态;例如T1;并且资料链结封装从PPP改变成讯框中继.