What are Point-to-Multi Point Microwave Backhaul Radios?
Point-to-Multi Point Microwave Backhaul Radios are radios that provide wireless connectivity between base stations and other wireless infrastructure equipment. In this case, one radio transmits to multiple radios. Point-to-multipoint backhaul radios significantly reduce the cost of expansion of cellular networks compared to using cables and fiber. They use microwaves in the frequency range from 2.4 to over 70 GHz and provide high speed communication links for the core network. Backhaul radios allow wireless connectivity over several kilometres. These links are usually high data rate LOS (Line of Sight) links that are the backbone of cellular networks.
A point-to-multipoint backhaul radio can communicate with several symmetrical nodes in a one-to-many network configuration. The central point-to-multipoint backhaul radio is called a 'hub’ and is connected to a number of remote ‘terminals’. Terminals may be point-to-point or other point-to-multipoint radios.
Important parameters for a Point-to-Multipoint Backhaul Radio:
- Operating Frequency: Backhaul radios use microwaves in the range of 2.4 GHz to over 70 GHz. Operation at higher bandwidths offers higher bandwidths.
- Number of terminals: This is the maximum number of access points for which the backhaul radio can maintain a wireless connection.
- Data Rate: It is the maximum speed at which the backhaul radio can transmit signals.
- Range: This is the maximum distance up to which a backhaul radio module can transmit wireless signals.
- Transmit Power: This is the amount of power of RF energy that the radio’s transmitter produces at its output. Higher transmit power would result in stronger wireless signals that can travel over longer distances.
- Receiver Sensitivity: Receiver sensitivity is the measure of the minimum signal strength the backhaul can detect.
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