User's Manual Part 2

178 APCD-LM043-8.0 (DRAFT C)
12: Specialized Applications
In the above configuration, a backhaul is created between the local CCU1 (CAP1) and the
remote CCU2 (CAP2) by deploying an EUM (Thin Route EUM) from CAP1 in CAP2. The Thin
Route EUM will operate at the frequency of CCU1 and have CCU1 as its gateway.
CCU2 may be connected to the Ethernet port of the EUM either directly or through a switch.
Additional subscriber EUMs may then be deployed off CCU2.
To correctly route the traffic between CAP1 and CAP2, routes need to be added to the CAP1
router and CAP1 CCU1. The latter route is required to route the traffic to CCU2.
Traffic traversing from the CAP2 subscribers’ radio network will place additional load on CAP1
CCU1, reducing its available throughput. In order to improve the overall backhaul
performance, a special grade of service (Thin Route GOS) should be provisioned in CAP1
CCU1 and assigned to the Thin Route EUM.
12.2 EUM Backhaul
In some cases, it may be cost-effective to use an EUM as the backhaul link as an alternative to
a separate wired or wireless link to the CCU, as is illustrated in Figure 62.
Figure 62 Using an EUM for Backhaul
The above configuration has one CCU located at a remote location and one EUM (Backhaul)
installed at a NAP or CAP. The CCU’s Ethernet port is unused and may be left unconnected,
or with appropriate routing it may be used for a co-located user PC. The Backhaul EUM’s
Ethernet would typically be connected to a router, switch, or a hub. The subscriber EUMs are
setup as normal.
The Backhaul EUM scenario creates an extended bridged network with Backhaul EUM, CCU,
and subscribers EUMs following the same IP scheme as the rest of the existing network.
The Max Customers setting in the Backhaul EUM applies to the number of hosts on the
Ethernet side of the Backhaul EUM, not to the number of customers served by the CCU.
WaveRider recommends setting Max Customers to 50.
To have a good backhaul performance it is important that the Backhaul EUM is positioned for
optimum RF reception (for example, on a tower).
Backhaul EUM
CCU3000
Antenna
EUM
EUM
Data path from end-user
modem to network