User guide
The EDA Components
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1/1551-HSC 901 35/3 Uen C 2005-12-02
Figure 13 Cabling of Ethernet Cables for Link and PoE Redundancy
4.1.5 The ECN Aggregation Node
The heart of an EAN is a node controller, the Ethernet Node Controller,
which is an integrated part of the ECN330/ECN320, which also functions as
a 24 ports Ethernet switch.