gsm is global system for mobile communication. it uses fdma 
& tdma.

cdma:-  it stands for code division mutiple access.

gsm is stands for global system for mobile communication. it
use tdma & fdma techniques as access mechanism . in gsm we
devide bandwidth in to time slots for better utilization of
bandwidth.

cdma stands for code devision muliple access it use cdma
techniques as access mechanism . in cdma we allocate a
unique code for every user saparately and allocate bandwidth
to user

GSM and CDMA techniques can be explained with an example 
suppose there are 10 persons in a room and they want to
communicate with each other .How can they communicate?
First method:One persons speaks at one time that means we
have provided a definite time interval to that person.-GSM
Second method :all the peers  speak at a time in a different
language which we call as CDMA

gmsk

ms, BTS, BSC, MSC, HLR, VLR etc...

TRAI and Dot (Department of telecommunication)

5u8ikm ki

What is the difference between Diplexer and Duplexer and 
what position?
Used for separating sending and receiving  signals to/from 
antenna.

What is the different between CDU C and CDU A
CDU A uses filter combiner and c uses hybrid

There are many differences are there between 1x Rtt and 1x 
EVDO ----
1. first thing comes to mind the channel structure
in 1x RTT there are 4 forward channel and two rev channel . 
but in ev do that channel structure is different . control 
channel and the rest is total data

2. the basic and major difference is 1x RTT is based upon 
CDMA and 1x evdo is TDMA

3.

GPRS is 2.5 generation of GSM. Radio interface is same as GSM.
so i think it also uses the same frequency band and moulation.
i.e 900/1800Mhz,GMSK modulation.

signals are same .but bits rates have been varied.as 
egprs=edge.its a seperate service some hw needs to be 
added.ports should be avails .

globle mobile service.

Global system for mobile communication

Global system for mobile communication

( its the full form when it was formed)GROUPE SYSTEM FOR 
MOBILE

Global system for mobile communication

GLOBAL SYSTEM FOR MOBILE COMMUNICATION

Global System for Mobile Telecommunication

all the other persons who gave this answers are an asshole

Bakchod...land jaisa sawal poochta hai.................

Previously it was Group Special mobile later it is Changed 
to Global system for mobile communication

GSM is 2G .and its uses FDMA and TDMA .ITs stand for Global
System For  Mobile Communication .Gsm operates in 3 ranges
900,1800,1900 MHz .it is devided into 4 part MS , BSS,OSS.NSS.

Global system for mobile communication

GSM is a combination of TDMA& FDMA.all mobile networks works
on 900/1800 mhz.

GSM Stands for Global system for Mobile. It is a 
combination of TDMA(Time Division Multiple Access) & FDMA
(Frequency Division Multiple Access). 
It is B1 Technology system for communication. It operates 
in the frequency range of 800-900Mhz.
In simple words we can understand that this is the system 
in which SIM(Subscriber Identity Module) is used.

Faltu ka sawl.....

yeh taiwan k log indians ko mamu sakajntr hain kya>>>

Gsm stands for global system for mobile communication and is
an open, digital cellular tecnology used for transmitting
mobile voice and data recives.its is used tdma naronabd
tecnology.

gsm is a cellular network based on tdma and fdma.

gsm stands for "global systems for mobile 
communication".......which uses the basic tdma & fdma as 
its multiple access technique's......

GSM is the (GLOBAL SYSTEM FOR MOBILE COMMUNICATION)...it is
second generation technology..its performs the frequency
reuse concept..its data rate is abt 9.6kbps..

GSM is a 2nd Generation communication system.GSM have wide 
range of applications related to security systems.Gsm 
operate in bands 900/1800/1900 MHZ.We can implement a best 
security system usung best sensors and fast response GSM 
modem.

FCC is federal communication comitee of USA. it is 
regulatory authority of USA like TRAI(actually DOT) in 
india.
Its role is to allocate frequencies from RF spectrum (1 HZ- 
300 GHZ) and providing licences for different application 
like TV, mobile comm., satellite comm. etc.

actually bluetooth works on a 2.4 GHZ ISM band which is an 
unlicenced band. hence FCC is not related to it much.

it is an IEEE standard, so interoperability was prescribed 
at the development phase.

frequency hopping is a spread spectrum technique in which 
the transmitter transmits at varying frequencies for very 
small periods of time say milli or nano sec. these 
frequencies are choosen in random among the frequency band 
available. the reciever and tansmitter both are aware of 
the sequence of the frequencies going to be used.
if some other agent tries to break the system and suppose 
tunes to a particular frequency then he'll be able to get 
that small part of the msg only because from next milli 
sec, the frequency is going to change hence through this 
wide band and secure transmission is achieved. 
used in bluetooth as well as in Wireless lans.
there are 69 frequency bands in bluetooth and hopping rate( 
rate of switching from one freq. to other) is around 1600 
hops/sec

2402 MHZ- 2470 MHZ in europe and USA

it works on the ISM frequency 2.4 Ghz

the band is 2.4GHZ.
range is 2402MHZ to 2470 MHZ in europe & USA.

In a piconet there can obnly be 1 master and 7 slaves