what is SDH and PDH relate the differences between them?
Answers were Sorted based on User's Feedback
Answer / p jayakumar
PDH is Plesiochronous Digital Hierarchy and SDH is
Synchronous Digital Hierarchy.Both are used in PCM
transmission systems. Both use TDM principles for PCM
frames.
The difference is In PDH the clock used is not the
same throughout the transmission network. But in SDH a
synchronous clock is used in the entire Transmission system.
PDH is the old system used for only point to point
communication and interconnectivity between the sytem is
difficult.Whereas SDH is the lattest system used in any
kind of transmission configuration and interconnectivity
between different systems is very easy.PDH used in
2Mb,8Mb,34Mb and 140 Mb systems only.But SDH used in STM-1
(155.52Mbps,STM-4(622.08Mbps),STM-16(2.5Gbps) and STM-64
(10G BPS) transmission systems.
There are many merits in SDH
Easy for Add Drop multiplexing/Demultiplexing is easy.
Very useful for Ring configuration in optical
communications.
Easy growth to high bit rates in steps with evolution of
transmission technology.
Capable of transporting ATM(Asynchronous Transfer Mode)
channels,DLC(Digital Loop Carrier) is working on SDH.
SDH is the Indian sytem which is equivalent to American
SONET(Synchronous Optical Network)
Is This Answer Correct ? | 150 Yes | 11 No |
Answer / mughis
SDH is cost effective and easy traffic cross capacity. but PDH has not ..
Is This Answer Correct ? | 70 Yes | 13 No |
Answer / shankar
SDH - Synchronous Digtal heighrarchy & PDH - Plesiochronous
http://telecom-transmission.blogspot.in/2013/03/pdh-basics-pdh-interview-questions.html
Is This Answer Correct ? | 16 Yes | 3 No |
i am an i.t.i holder in electronics i need those questions and their which have been asked in aircraft company for the post of technician
A good op-amp has A Very high bandwidth B Narrow bandwidth C High selectivity D All of these
What is power electronics?
write power supply application, manufacturing, advantages, cost
Where are multimode fibers practically used?
types of flages in micro processor ?
my name is komal. iam diploma 6th sem want to need last gtu maths paper.plz give me a link of that papers can be downloaded.
What is the auto correlation function of a discrete time white noise?
if building "b" height casts a shadow "f ' feet long . the same day a tree "t" feet height will cast a shadow how many feet long ? a)ft/b b)fb/t c)b/ft d)tb/f e)t/fb
what is the uses of VSB?
as i m an electronics engineer,and doing testing course,if interviewer ask me a question that after being an engineer,why u choose testing field,what should i answer?
What is DTX? Why is it used?