CTC Store CTS Union IP DSLAM for ADSL IPDSLAM-A8/A16 - Manual (Page 12)

ADSL IP DSLAM
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Figure 0-2 PPPoE application in ADSL 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 ADSL 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). ADSL IP DSLAM concentrates all Ethernet-with/without VLAN-tag
packets from 16 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 ADSL IP DSLAM supports ADSL CPE Bridge-mode (RFC-1483 Bridge
mode and router mode). For performance concern, ADSL IP DSLAM will not
act as BRAS to process user application information directly.
ADSL 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. ADSL IP DSLAM supports 2 ATM
PVC links for each ADSL CPE.