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 |
what is that functionality of a relay? draw aconnection for relay?
how to calculate percentage impedance
What are the maintenances of a PLC ?
needed web address and its directory for objective type question with answer in electronics instrumentation paper.
4 stage ripple counter with delay(f/f) 10msec. How much time it takes for a state to change
i want BHEL electronics and communication placement papers.
What are d uses of a diode . What is diode equation . And what is its use
2 Answers Bosch, Infosys, Siemens,
equation for pid controller?
Normally we say cellphone is a embedded device but computer is not a embedded system. Today cell phones have the facility to install software. so the cell phone is embedded or not
15. Ater interface is between transcoder and MSC – True/False 16. SS7 signaling is used in Abis interface – True/False 17. FlexiEdge BTS has RRI card – True/False 18. From Transcoder to MSC, data rate for each call is 64Kbps – True/false
why transformer does not work dc
What is handover and what are its types?
Civil Engineering (5086)
Mechanical Engineering (4456)
Electrical Engineering (16639)
Electronics Communications (3918)
Chemical Engineering (1095)
Aeronautical Engineering (239)
Bio Engineering (96)
Metallurgy (361)
Industrial Engineering (259)
Instrumentation (3014)
Automobile Engineering (332)
Mechatronics Engineering (97)
Marine Engineering (124)
Power Plant Engineering (172)
Textile Engineering (575)
Production Engineering (25)
Satellite Systems Engineering (106)
Engineering AllOther (1379)