10 Aviat Networks
Chapter 3. Eclipse Edge Installation
Installing an ODUspe Coupler
Refer to:
• ODUspe Coupler Overview on page 10
• ODUspe Coupler Installation Procedure on page 11
• Installing ODUspe Cable and Connectors on page 12
ODUspe Coupler Overview
Couplers are used to connect two ODUs to a common antenna for single antenna,
hot-standby protected operation. Couplers are available for equal loss or unequal
loss.
• For equal loss the attenuation per side is nominally 3.5 dB (3.5 / 3.5 dB), which
applies to both the transmit and receive directions, meaning the additional total
one-way attenuation compared to a non-protected link is 7 dB.
• For unequal loss the attenuation is nominally 1.5/6.5 dB. They have application on
rain-affected bands, 13 GHz and above.
When using a coupler to combine two ODUs onto a single polarization, the operating
channels must be chosen from within the same diplexer option. If the two ODUs are
not from the same tuning/diplexer option then interference may occur, resulting in
degraded link performance.
The rationale for using unequal ratios is that they can be shown to lower annual
outage due to rain fades as compared to links deployed with equal loss couplers.
For information on unequal coupler (combiner) rationale refer the
Aviat Networks’ Best Practices Guide.
For band-specific coupler loss data refer to Coupler Losses on page 40.
Coupler waveguide feed-heads mirror those for the ODU and antenna. Refer to
Figure 3-6.
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