what is SDH and PDH relate the differences between them?
- 3 Answers
- 49406 Views
- Ericsson, Tata Teleservices, I also Faced
- E-Mail Answers
Answer Posted / 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 |
Post New Answer View All Answers
What is an ac emitter resistance?
The output of a 60hz full-wave bridge rectifier has a 60 hz ripple. It this circuit working properly?
how a choke of tubelight can be used to increse reciving power of antina?
how to calculet the resolution of 4 to 20 mA current signal
what is the basic steps for designing an ups,inverters, and battery connections for series and parrallel connections in ups
For how much time F-1 vissa is valid?
How do the transition region width and contact potential across a p-n junction vary with the applied bias voltage?
what is the bani fit of ss7 by using as a back bone for all other communication networks?
What are the UE modes in GSM,GPRS,UMTS and LTE
What is a comparator?
Why every time that I hit the microphone or when I speak louder the amplifier is switched of?
What is half duplex transmission?
Explain zener breakdown and avalanche breakdown?
What happens when a voltmeter is connected in series with the circuit?
Pls tell me when will coming ssc scientist assistant result...how many marks for elgilibity.. Am a minority girl oc
