1+0, 1+1, 2+0 Deployments

Microwave ODUs can be deployed in various configurations.

Microwave ODU in 1+0 Configuration with Antenna

The most common is 1+0 which has a single ODU, generally connected directly to the microwave antenna.  1+0 means “unprotected” in that there is no resilience or backup equipment or path.

Two Microwave ODUs in 1+1 HSB or 2+0 configuration with Coupler and Antenna

For resilient networks there are several different configurations.  1+1 in “Hot Standby” is common and typically has a pair of ODUs (one active, one standby) connected via a Microwave Coupler to the antenna.  There is typically a 3dB or 6dB loss in the coupler which splits the power either equally or unequally between the main and standby path.

Other resilient configurations are 1+1 SD (Space Diversity, using separate antennas, one ODU on each) and 1+1 FD (Frequency Diversity)
The other non-resilient configuration is 2+0 which has two ODUs connected to a single antenna via a coupler.  The hardware configuration is identical to 1+1 FD, but the ODUs carry separate signals to increase the overall capacity.

Grounding & Surge Protection
Suitable ground wire should be connected to the ODU ground lug to an appropriate ground point on the antenna mounting or tower for lightning protection.  This grounding is essential to avoid damage due to electrical storms.
In-line Surge Suppressors are used to protect the ODU and IDU from surges that could travel down the cable in the case of extreme surges caused by lightning
The specification of a typical Microwave ODU is shown below.

Typical ODU Features and Specifications:
●4-42GHz frequency bands available
●Fully synthesized design
●3.5-56MHz RF channel bandwidths
●Supports QPSK and 16 to 1024 QAM.  Some ODUs may support 2048QAM
●Standard and high power options
●High MTBF, greater than 92.000 hours
●Software controlled ODU functions
●Designed to meet FCC, ETSI and CE safety and emission standards
●Supports popular ITU-R standards and frequency recommendations
●Software configurable microcontroller for ODU monitor and control settings
●Low noise figure, low phase noise and high linearity
●Compact and lightweight design
●Very high frequency stability +/-2.5 ppm
●Wide operating temperature range: -40°C to +65°C

For Further information

For More Information about Microwave ODUs, we will be delighted to answer your questions. Please Contact Us

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