COMPUTER – BANDS
BLUE
BAND --- 2001
Broad
Band
56 Kbit/sec full use of a telephone line.
Broad band is called high speed.
2006 - 256 Kbit/sec
2009 - basic broad band - 768
Kbits/sec
Tier – 1 - DS-1 - 1.544 Mbits/sec
Tier – 3 - DS-3 - 44.736 Mbits/sec
According to NTL 150 GB of data in 2001 to 500 GB of data in 2002 --- 4
TB
Internet Broad band signal has to travel at 36,000 kms and back.
Due to this the signal delay will be 500 to 900 milliseconds.
1. Satellite
Broad band
2. Cellular
Broad band
3. 3G
… EVDO, HSDPA, UMTS
L – Band
1 – 2 GHZ
Some communication satellites
Military purpose
GPS
GSM mobiles
Optical communication
S – Band
2 to 4 GHz in radar range.
C – Band
4 – 8 GHz
X – Band
8 – 12 GHz
KU
– Band
12 – 18 GHz in Radar range.
Main use satellite communication
Space shuttle communication
1983 first used
Digital data transmissions
TV transmissions
K – Band
18 – 26 GHz
Q – Band
30 – 50 GHz
U – Band
40 – 60 GHz
V – Band
50 – 75 GHz
D – Band
110 – 170 GHz
FREQUENCY RANGE
|
S. No.
|
Frequency
|
Range
|
…Hertz
|
|
1.
|
ELF
|
3 – 30
|
Hertz
|
|
2.
|
SLF
|
30 – 300
|
“
|
|
3.
|
ULF
|
300 Hz – 3
|
KHz
|
|
4.
|
VLF
|
3 – 30
|
“
|
|
5.
|
LF
|
30 – 300
|
“
|
|
6.
|
MF
|
300 KHz – 3
|
MHz
|
|
7.
|
HF
|
3 – 30
|
“
|
|
8.
|
VHF
|
30 – 300
|
”
|
|
9.
|
UHF
|
300 MHz – 3
|
GHz
|
|
10.
|
SHF
|
3 – 30
|
“
|
|
11.
|
EHF
|
30 – 300
|
“
|
Frequency
Units
1.Hertz
2.Kilo
hertz
3.Mega
hertz
4.Giga
hertz
5.Tera
hertz
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