User guide

The EDA Components
1/1551-HSC 901 35/3 Uen C 2005-12-02
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Figure 12 EDN312 Link Aggregation
Two ports of the ECN330/ECN320 can be joined to form one aggregated
link. This is also called a trunk. By trunking two ports, the speed can be
increased to 200 Mbps. The two uplink ports can also be grouped. There is
a limitation though because the ECN330/ECN320 only supports up to 6
aggregated links.
This means that if the two uplink ports are grouped, only 5 downlink trunks
can be created. If the extended EDN288x is cabled and configured to
utilize the maximum number of aggregated links, this will result in two EANs
with 144 end-user connections each (72 aggregated and 72 normal).
Connecting the single uplink IP DSLAMs to two ports will ensure PoE
redundancy, as well as easy change of the aggregated devices without the
need of changing the cabling on site.
When a link aggregation is selected as the link type of an EDN312x in
PEM, both Ethernet connections will automatically be activated. As
previously mentioned it is not possible to select more than six aggregated
links for a single ECN330/ECN320.
The cabling is illustrated below in Figure 13 on page 22. The illustration
shows how the IP DSLAMs in the upper row of the EDN288x are connected
to the ECN330/ECN320. The IP DSLAMs in the lower row are connected to
the lower ECN330/ECN320 the same way.