difference between GSM900,DCS1800 and PCS1900-GSM900,1800,1900

difference between GSM900, DCS1800 and PCS1900-GSM900, DCS1800, PCS1900

This page compares GSM900 vs DCS1800 vs PCS1900 and mentions difference between GSM900, DCS1800 and PCS1900.

Specification	GSM900	DCS1800	PCS1900
Downlink Fequencies	935.2 to 960MHz 925.4 to 935 MHz(extended band)	1805 to 1880 MHz	1930 to 1989.6 MHz
Uplink Frequencies	890.2 to 915 MHz 880.4 to 890 MHz(extended band)	1710 to 1785 MHz	1850 to 1909.6 MHz
Channel numbers and number of available channels	1 to 124 = 124 channels 975 to 1023 =49 channels(extended band)	512 to 885 = 374 channels	512 to 810 = 299 channels
Formula to convert frequency and channel number-Downlink	n = ARFCN = 1-124 F(DL)=(935.2+0.2*(n-1)) MHz	n=ARFCN = 512-885 F(DL)= (1805.2 + 0.2*(n-512)) MHz	n=ARFCN=512-810 F(DL) = 1930 + 0.2* (n-512) MHz
Formula to convert frequency and channel number-Uplink	F(UL)= (890.2+ 0.2*(n-1)) MHz	F(UL)= (1710.2+0.2*(n-512)) MHz	F(UL)= (1850.2+0.2*(n-512)) MHz
Formula to convert frequency and channel number-Extended Band-Downlink	F(DL)= (935.2+0.2*(n-1024)) MHz	-	-
Formula to convert frequency and channel number-Extended Band-Uplink	F(UL)= (890.2+0.2*(n-1024))	-	-