APC IP DSLAM Guia do Utilizador descarregar pdf (Página 12)

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ADSL2/2+ IP DSLAM

Broadband Access Server, and the user application information is serviced.

Figure 0-2 PPPoE application in ADSL2/2+ IP DSLAM with Ethernet-

All-The-Way Network

In addition to traditional ATM-based ADSL network. As Fig 0-2 displays, the

user application information is still 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 the ADSL2/2+ IP DSLAM, all the ATM cells belong to the specified VC

are decapsulated back to the original PPPoE encapsulated Ethernet packet

(if VLAN-mode of the specified ADSL port is disabled), or mapped to the

pre-defined Ethernet-VLAN packets (if VLAN-mode of the specified ADSL

port is enabled). ADSL2/2+ IP DSLAM concentrates all Ethernet-

with/without VLAN-tag packets from 48/24 ports’ ADSL and uplinks to ISP’s

Ethernet-All-The-Way network. The PPPoE frames will be resolved at

Broadband Access Server (BAS), and the user application information was

serviced.

The ADSL2/2+ IP DSLAM supports ADSL CPE Bridge-mode. For future FW

upgrade, the ADSL2/2+ IP DSLAM can act as BRAS to process user

application information directly.

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