What is DCS in mobile phone signal amplifier?

According to the network types supported by the cell phone signal amplifier (micro repeater), there are three types:

1) Single-frequency mobile phone signal amplifier is an amplifier supporting one frequency, including GSM mobile phone signal amplifier (2G low-frequency network supporting mobile and China Unicom), DCS mobile phone signal amplifier (2G low-frequency network supporting mobile and China Unicom), W-CDMA mobile phone signal amplifier (3G network supporting China Unicom) and CDMA mobile phone signal amplifier (2G and 3G networks supporting telecommunications).

2) Dual-band mobile phone signal amplifier is an amplifier supporting two frequencies, including GSM/DCS dual-band mobile phone signal amplifier and GSM/W-CDMA dual-band mobile phone signal amplifier.

3) Tri-band mobile phone signal amplifier is an amplifier supporting three frequencies, including GSM/DCS/W-CDMA tri-band mobile phone signal amplifier, GSM/CDMA/W-CDMA tri-band mobile phone signal amplifier, GSM/CDMA/DCS tri-band mobile phone signal amplifier, etc. This kind of machine is difficult to manufacture, so the cost is high. Often the total cost of three sets of machines with different frequencies is far less than that of a set of machines with three frequencies. In addition, the power of the three-frequency machine is not large, and the coverage area is very small.