Ericsson MINI-LINK TN R3 ETSI, Technical Description

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MINI-LINK TN R3 ETSI
3.8 Traffic Routing
The main function of the microwave hub site is to collect traffic carried over
microwave radio links from many sites and aggregate it into a higher capacity
transmission link through the access network towards the core network. The
transmission link northbound may be microwave or optical.
These hub sites have usually been built by connecting individual microwave
Radio Terminals with cables through Digital Distribution Frames (DDF) and
external cross-connection equipment.
MINI-LINK TN R3 provides a traffic routing function that facilitates the handling
of traffic aggregation. This function enables interconnection of all traffic
connections going through the NE. This means that an aggregation site can
be realized using one AMM housing several Radio Terminals with all the
cross-connections done in the backplane.
Each plug-in unit connects nxE1 to the backplane, where the traffic is
cross-connected to another plug-in unit. The E1s are unstructured with
independent timing.
One way of using this function at a large site is to cross-connect traffic from
several Radio Terminals to one LTU 155 (63xE1) for further connection to
the core network.
At a smaller site, it is possible to collect traffic from several Radio Terminals
with a low traffic capacity into one with a higher traffic capacity.
Plug-in
Unit
Plug-in
Unit
Plug-in
Unit
Plug-in
Unit
Plug-in
Unit
TDM bus
nxE1 nxE1 nxE1 nxE1 nxE1
≈
400xE1
6626
Plug-in
Unit
nxE1
Plug-in
Unit
nxE1
Plug-in
Unit
nxE1
Plug-in
Unit
nxE1
Figure 41 Traffic routing
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