User guide

The EDA Concept
1/1551-HSC 901 35/3 Uen C 2005-12-02
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2.2.1 The IP DSLAM
The IP DSLAM is the cornerstone in the EDA system.
It converts and aggregates all incoming ADSL subscriber lines into a 100
Mbps Ethernet connection and as opposed to a traditional DSLAM system,
the ATM layer in the ADSL protocol stack is terminated directly in the IP
DSLAM. By using link aggregation the subscriber lines can be increased to
200 Mbps connections.
To ensure high security for end-users and EDA equipment the IP DSLAMs
are capable of filtering the traffic in both upstream and downstream
direction.
The Ethernet based access function provided by the IP DSLAMs can be
extended to create different types of multi-service network architectures.
The EDA system is built around a number of different IP DSLAMS
described in more detail in section 4 on page 13.
2.2.1.1 Line Bonding
The IP DSLAM enables bonding of lines in order to provide high or very
high bandwidth to End-users. Line bonding is defining and using several
twisted pairs copper wires as a one line. Up to six lines can be bonded,
enabling a theoretical downstream bandwidth 132 Mbps. 44 Mbps can be
achieved with two bonded lines (1.5 km or less). Figure 2 on page 5
illustrates a comparison of line bandwidths using ADSL, ADSL2+ and two
bonded ADSL2+.
Reach (km)
1234
Bandwidth
(Mbps)
10
20
30
40
50
2 bonded ADSL2+ lines
ADSL2+
ADSL
Figure 2 Line Bonding Utilization