APC IP DSLAM User's Guide Page 9

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Introduction to the EDA 1200 System
Figure 2 Broadband Drop Technologies: Bandwidth and Reach
As illustrated in Figure 2 on page 5, End-users with different line length and
different needs can benefit from different drop technologies.
2.1.1.1 DSL
EDA 1200 supports all current major DSL variants
VDSL2
ADSL2+
ADSL2
ADSL
The principles of all the different ADSL modes are the same, while VDSL2 is
basically different. The difference reflects the wide deployment of Ethernet:
while ADSL relies on Asynchronous Transfer Mode (ATM) mechanisms to
ensure Quality of Service (QoS), VDSL2 relies on Packet Transfer Mode (PTM)
scheduling mechanisms. PTM replaces both ATM and RFC 2684 (which,
among others, contains AAL5) in the protocol stack.
5
1/1551-LZA 101 464-V1 Uen C 2009-12-17
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