Answer / sanjay kumar pal

FDM IS USED FOR ANALOG SIGNALS GENERALLY FOR THE SIGNALS
TRANSMITED THROUGH TWISTED PAIR CABLE.
WHILE
WDM IS USED FOR SIGNALS TRANSMITTED THROUGH OPTICAL FIBER
CABLES.
BOTH ARE SAME BUT USED IN DIFFERENT AREAS.

Answer / aby perumpanany

FDM > Frequency Division Multiplexing
WDM > Wavelength Division Multiplexing

Answer / hakani raj

their is no difference between FDM and WDM because wavelenth is inversly proportional to frequency. but generally when we are working on optical domain then we consider WDM because

i) we have limited source to genrate light using LED or LASER. using this we can genrate light easily and then passthourgh prism to get different wavelength. we can not genrate such high frequency.

ii) to analysis of such high frequency in CRO is not possible that why we are using WDM when we r working on Optical domain


Regards,
Raj Hakani
(M.tech Communication)
Nirma University

Answer / vinit92

in fdm data transmitted based on the particular frequency
and in wdm data transmitted based on the particular wavelength .
fdm is used in twisted pair cable and wdm is used in fiber
optic cable .

Answer / sandhi

yes

serial to parellel conversion is done by :

6 Answers   TCS, Verifone,

Tell me something about IN call Flow and what is the difference between the flows in both GSM and CDMA technologies?

0 Answers   Huawei,

which exam date in wbsedcl in 2009

4 Answers   HAL, wbsedcl,

generic values for: • Maximum power • Emission bandwidths and modulation types • Frequency ranges, frequency stability, attenuation of intermodulation products and selectivity of a quadband dual simm chinese cellphone?

1 Answers  

i want RRB chennai section engineer model papers &previous years papers including GK, ARITHEMETIC, REASONING, GENERAL ENGLISH IN THE YEAR 2005,2006,2007, 2008.

1 Answers  

which modulation will be suitable for transmitting audio file? is there any transformation needed for transmission?

0 Answers  

What is the ruturn loss?

4 Answers   Ericsson,

ripple factor of half bridge rectifier???

1 Answers   ISRO,

Hi.. I M Goinig to appear for ISRO exam On 26 April 2009. is any body tel mi the pattern of question paper ant the interview question regarding that...

5 Answers  

What is circuit testing?

0 Answers  

What do you mean by effect of noise on carrier signal & what is noise segment

0 Answers   TATA,

What is the difference between <stdio.h> and "stdio.h"?

2 Answers