Which of the following statements about the improvement of ADSL2 relative to ADSL is correct: ( Choose one or more )
A . The frequency band of ADSL2 is twice that of ADSL
B . At the same transmission rate, ADSL2 can transmit longer distances than ADSL
C . Compared with ADSL, ADSL2 adds a new operating mode
D . ADSL can support flexible bandwidth binding function, such as IMA ( Inverse Multiplexing forATM , ATM inverse multiplexing )
Answer: BCD
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