In addition to traditional ATM-based ADSL network. As above Figure 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 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-definedEthernet-VLAN packets (if VLAN-mode of the specified ADSL port is enabled). IP DSLAM concentrates all Ethernet-with/withoutVLAN-tag packets from 24/48 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 IP DSLAM supports ADSL CPE Bridge-mode. For future FW upgrade, the IP DSLAM can act as BRAS to process user application information directly.
IP DSLAM provides Ethernet-with/without VLAN tag to ATM-PVC mapping feature for the ISP to isolate user’s data with security and to provide lots of service enhancement capabilities. IP DSLAM supports 8 ATM PVC links for each CPE.
