User guide

The EDA Concept
6 1/1551-HSC 901 35/3 Uen C 2005-12-02
2.2.2 The Aggregation Node
As shown in Figure 1 on page 4 the IP DSLAMs are connected to an
aggregation node. Ethernet switches can be used as aggregation nodes
and provide the capability to increase the LAN bandwidth because they
allow for simultaneous switching of data packets between their ports.
Furthermore, an Ethernet switch may be able to perform more advanced
functions regarding traffic, such as prioritizing and separation.
A typical EDA switch used in an EDA system is the ESN310, which has 24
100 Mbps ports and two Gigabit Ethernet ports for the aggregated traffic
towards the edge node. The ESN310 has built-in power over Ethernet and
can thus supply the IP DSLAMS with –48 V power.
The Ethernet Controller Node and the EAN
Another type of aggregation node is the Ethernet Controller Node ECN,
which also provides layer-2 Ethernet switching with built-in power over
Ethernet, but has additional functions like automatic loading of software and
configuration data into the connected EDA nodes. The ECN has a built-in
node controller. It is a self-sustained IP DSLAM so to speak, composed of a
number of IP DSLAMs (EDN312) connected to the ECN330/ECN320 either
directly or through the EDA 8-port switch ESN108.
One of the key features of the EAN is the ability to act as a single node in
the EDA network, and all the “embedded” IP DSLAMs are added or
removed in a true plug-and-play way. The ECN330/ECN320 automatically
registers the nodes and their ports making implementation, expansion and
replacement of nodes very user-friendly and another advantage is, that
network elements are maintained by the ECN330/ECN320.
This means that the EAN does not depend on the Public Ethernet
Management system (PEM) when starting or restarting, and does not
depend on a Domain Server during normal operation, and furthermore
reduces the number of IP addresses necessary in the management
network.
The ECN330/ECN320 and the EAN are described in further detail in
section 4.1.4 on page 19.
2.2.3 The EDA Management System
The EDA management system provides the operator with a single
aggregated management platform for the complete EDA system.
The EDA management system is called Public Ethernet Management
(PEM). The management system is designed with scalability in mind, and
scales from a single server solution, where all parts of the system are