1+0
This is the standard link configuration with a single indoor unit and outdoor unit per end.
This is called an ‘unprotected’ link.
1+1HSB
1+1HSB is a link with a Hot Stand By (HSB) set of radios and indoor units incase of failure. This is also called a ‘protected’ link for high levels of redundancy and availability suitable for critical links.
2+0
2+0 has two sets of radios both operating at the same time to double the links bandwidth. This setup requires 2 sets of channels and dual polarity dishes.
1+1SD
Spatial Diversity (SD) is used on long links to improve the receive signal levels. There is usually a minimum distance required between each sets of antennas to make sure that the system can operate effectively.
Other Configurations
There are other configurations possible with combinations of radios for primary or protection and with diversity. It is possible to run a 4+0 link (4 transmitting and receiveing radios) but this requires 4 sets of channels which can be very expensive depending on the licensing zone the links are deployed in.
This image shows either a 1+1HSB or 2+0 configuration of outdoor units mounted to the back of a dish using a coupler.
Licensed Microwave Frequencies and Channels
In Australia it is possible to obtain frequencies in the following bands for a licensed microwave link:
- Lower 6GHz, Upper 6GHZ
- 7.5GHz
- 10.5GHz
- 15GHz
- 18GHz
- 23GHz
There are other bands available but some vendors don’t cover them with equipment.
Lower frequency bands are better for longer distance links but generally have smaller channel sizes which means lower throughput.
Higher frequency bands are used for shorter links, have bigger channel sizes and have far greater throughput.
It is also possible to license adjacent channels to create very high bandwidth links.
Get in CONTACT with us at Direct Networks to discuss how a microwave network would suit your application.