Applications_of_Digital_Microwave

#Applications_of_Digital_Microwave

1.Used for Complementary networks to optical networks
2.BTS backhaul transmission
3.Redundancy backup of important links
4.VIP customer access
5.Emergency communications
6.Special transmission conditions

Generally-used frequency bands in digital microwave transmission include:

7GHz / 8GHz / 11GHz / 13GHz / 15GHz / 18GHz / 23GHz /26GHz / 32GHz / 38GHz

Every frequency band is identified by its central frequency, for example, the central frequency of the 7 GHz frequency band is 7575 MHz.

the rough principle of microwave band application is that low-band microwave is usually used for large-capacity. But the network sometimes uses the lowest frequency band. The lower frequency band has the longer wavelength and the stronger diffraction ability. There are several rules on the use of frequency bands based on practical application experience,

1.For long-haul PDH microwave links (distance between stations is generally longer than 15 km), 8 GHz frequency band is recommended. If the distance between stations is not longer than 25 km, 11 GHz frequency band can also be used. The specific frequency band shall be determined based on the local climate conditions and microwave transmission cross-section.

2.For short-haul PDH microwave links (generally used in the access layer and the distance between stations is shorter than 10 km), 11G / 13G / 14G / 15G / 18G frequency bands are recommended.

3.For long-haul SDH microwave links (distance between stations is generally longer than 15 km), 5G / 6G / 7G / 8G frequency bands are recommended. If the distance between stations is not longer than 20 km, 11 GHz frequency band can also be used. The specific frequency band shall be determined based on the local climate conditions and microwave transmission cross-section.
RF channel configuration

There are some important parameters, which are considered in common RF 1.channel configuration.
2.Frequency Range
3.Central Frequency
4.Transmit / Receive Spacing
5.Channel Spacing

#هندسة_الاتصالات