Appendix D --- What’s IP DSLAM

DSLAM and IP DSLAM in PPPoE application sample.

As above Figure displays, in traditional ATM-based ADSL network, the user application information is encapsulated by ADSL CPE into ATM cells in pre-defined VC (Virtual Channel, PVC), and then upstream the ATM cells to DSLAM via ADSL link. (In this example, the user information (PPPoE encapsulated) is encapsulated by ATU-R using RFC-1483 Bridge-mode encapsulation format.).

All the ATM cells belong to the specified VC is concentrated by the DSLAM, and switched in the ATM network clouds, to the defined destination (ISPs or Offices), at there the ATM cells and PPPoE frames is resolved by the Broadband Access Server, and the user application information is serviced.

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IDL series User Guide