A router with a serial interface will be used for an ISDN link.What other function group devices are required to complete the connection to the service provider? （）
- A、TE1
- B、TE2
- C、TA
- D、NT1
- E、NT2
正确答案:C,D
答案解析:有
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A router with a serial interface will be used for an ISDN link.What other function group devices are required to complete the connection to the service provider? （）
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