Zyxel VES-1624FT-55A [189/312] Pppoa to pppoe overview

Zyxel VES-1624FT-55A [189/312] Pppoa to pppoe overview
VES-1624FT-55A User’s Guide
189
CHAPTER 32
PPPoA to PPPoE
This chapter shows you how to set up the IP DSLAM to convert PPPoA frames to PPPoE
traffic and vice versa.
32.1 PPPoA to PPPoE Overview
Before migrating to an Ethernet infrastructure, a broadband network might consist of PPPoA
connections between the CPE devices and the DSLAM and PPPoE connections from the
DSLAM to the Broadband Remote Access Server (BRAS). The following figure shows a
network example.
Figure 102 Mixed PPPoA-to-PPPoE Broadband Network Example
In order to allow communication between the end points (the CPE devices and the BRAS),
you need to configure the DSLAM (the IP DSLAM) to translate PPPoA frames to PPPoE
packets and vise versa.
When PPPoA packets are received from the CPE, the ATM headers are removed and the IP
DSLAM adds PPPoE and Ethernet headers before sending the packets to the BRAS. When the
IP DSLAM receives PPPoE packets from the BRAS, PPPoE and Ethernet headers are stripped
and necessary PVC information (such as encapsulation type) is added before forwarding to the
designated CPE.
32.2 PPPoA to PPPoE Screen
Use this screen to set up PPPoA to PPPoE conversions on each port. This conversion is set up
by creating a PAE PVC. See Chapter 16 on page 99 for background information about creating
PVCs. To open this screen, click Advanced Application > PPPoA to PPPoE.
BRAS
PPPoE
PPPoA
Client

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