Chapter 2. Outdoor Installations
Vol. III-2-18 Alcatel-Lucent
Figure 2-13. Coupler Installation with ODUs: Rear View
Unused and Disconnected Coupler Ports
Unused ODU ports on a coupler must the blanked off with a microwave load as
at some frequencies the reflected power can affect operation at the remaining
port, partly canceling the wanted signal.
A flange-mounted termination is used to absorb the RF energy. They are needed
in 1+0 and cascaded coupler applications where some ODU ports are left open/
not attached to an ODU.
Terminations are available from Alcatel-Lucent.
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