ZyXEL Communications IES-1248-51 Betriebsanweisung Seite 237

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IES-1248-51V User’s Guide
237
CHAPTER 31
PPPoA to PPPoE
This chapter shows you how to set up the IES-1248-51V to convert PPPoA frames
to PPPoE traffic and vice versa.
31.1 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 111 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 IES-1248-51V) 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 IES-1248-51V adds PPPoE and Ethernet headers before sending the
packets to the BRAS. When the IES-1248-51V 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.
PPPoA
PPPoE
DSLAM
Client
BRAS
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