Planet-technology IP DSLAM IDL-4801 Bedienungsanleitung PDF herunterladen (Seite 706)

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IDL series User Guide

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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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