User guide

The EDA Components
14 1/1551-HSC 901 35/3 Uen C 2005-12-02
As opposed to many traditional DSLAMs the IP DSLAM also terminates the
ATM layer used on top of the ADSL connections, thus interfacing directly to
the switched Ethernet within the Access Domain. The IP DSLAM bridges
between the switched Ethernet and the Ethernet at the customer premises,
see Figure 7 on page 14.
Figure 7 Bridging the Access Domain and the CPE Ethernet
The IP DSLAM terminates all end-user lines, and is able to provide high
speed IP access to all end-users simultaneously. Installing the IP DSLAM
at the Central Office, does not force the end-users connected to an IP
DSLAM to have ADSL, which means that service activation of ADSL is
done individually per subscriber line through the EDA Management System
(PEM).
On the local loop each end-user has up to eight ATM Permanent Virtual
Circuits (PVCs), depending on the CPE modem. Each PVC is individually
configured with a maximum bandwidth and can be used for different Quality
of Service scenarios.
The IP DSLAM is also able to make a Line Qualification Test in order to
estimate the ADSL connection properties. The Line Qualification Test can
be performed when the IP DSLAM is installed. The ADSL line does not
have to be activated in order to perform a Line Qualification Test.
The IP DSLAM has a built-in Over Voltage Protection (OVP), which
replaces the primary OVP typically mounted in the MDF and conforms to
ITU-T K.20 and ITU-T K.21.
When the IP DSLAMs are aggregated using a non-EMP switch the IP
DSLAMs are often referred to a stand-alone.
When the IP DSLAMs are aggregated using the EMP based
ECN330/ECN320 they are often referred to as embedded nodes.