The vast majority of dslams currently installed on the Internet are dslams in this way. However, in many areas, operators have no longer expanded their existing metro ATM core networks and switched to building IP broadband metro core networks. ![]() Therefore, with the decreasing availability of metro ATM resources, ATM-based dslam has become increasingly difficult to adapt to the needs of actual networking, and ip dslam will become the direction of dslam's future development. Implementation principle ip-dslam is the same as atm dslam in the processing of adsl signals. The uplink signals are demodulated by dslam and converted into adsl signals. But in ip-dslam, these atm signals do not perform multiplexing and service type processing as in atm dslam. Instead, they implement the aal5 sar function and convert them into corresponding mac frames, that is, atm termination. ![]() During the termination of atm signals, Establish the corresponding relationship between the corresponding mac address and pvc. ![]() ![]() After the ATM signal is terminated, it is transmitted to the upper layer device through the fe uplink port of the LAN board, and enters the IP metropolitan area network.
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