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Modem type

1. 3GP's modem

1. GSM'S modem

Contraction from Modulator and demodulator.

Modem functioninging to inserts signal

information goes to carrier wave;

On the contrary demodulator takes is back signal

information of affiliate signal.

Subdivided modem on:

1. Amplitude Modulation( AM),

which is electronics series that changes

amplitude is carrier wave accords

with amplitude information signal.

2. Frequency Modulation( FM),

which is electronics series that changes

frequency is carrier wave accords

with frequency's change information signal.

3. Pulse Modulation( PM),

which is system pulse modulation can be differentiated as:

a. PAM( Pulse Amplitude Modulation)

arbitrary pulse amplitude of wave

according to information signal change.

b. PPM( Pulse Position Modulation),
which is arbitrary pulse position accords
phasa's angle information signal.

c. PWM( Pulse Width Modulation),
distance among arbitrary pulse
according to bearing signal frequency change.
4. Modulation Is digital, consisting of:
a. FSK( Frequency is keying's Shift),
which is bearing pulse shift accords
with outgrows binary number (analog signal that' dikodekan
1. Analog modem which is modem which change analog signal as digital signal
1. ADSL'S modem
ADSL'S technological modem (Digital Asymetric Subscribe Line)
one that enables to get net surfing wields
alae analog telephone coincide. Its trick is so easy,
to ADSL is given one tool which at conceive of Splitter or line divider.

Splitter's position is placed in front while line rings to come in. Your mean may not ramify modem line
to ADSL with straightforward voice.
Splitter's tool behoof to remove trouble
while are you are utilizing ADSL modem.
With Splitter both gets walking coincide,
where can you answer and call up someones
with ordinary telephone. At your other side makes a abode to get connected
with Internet via ADSL modem
1. Cable modem which is modem which accept direct data
2. of service provider passes TV Cable ... UMTS). Said such,
since passes through HSDPA formed by channel w CDMA a new one,
which is high speed downlink shared channel (HS DSCH)
one that... ... tem WCDMA (wideband CDMA)