Final Quizz for C.C on PDH, SDH & IP-MPLS along with OFC System

SDH primarily uses which multiplexing technique?

• Time Division Multiplexing

• Frequency Division Multiplexing

• Code Division Multiplexing

• Wavelength Division Multiplexing

PDH equipment in Indian Railways most commonly supports which interface?

• E1 (2 Mbps)

• E3 (34 Mbps)

• STM-1 (155 Mbps)

• OC-3

Which standard frame structure applies to 2Mb/s PDH links?

• 30 voice + 2 signaling time slots

• 24 voice + 1 signaling slot

• 32 voice channels only

• 16 user + 4 control slots

What is the basic SDH rate used in Indian Railway backbone networks?

• 2 Mbps

• 34 Mbps

• 155 Mbps

• 622 Mbps

SDH network topologies commonly implemented are:

• Linear bus

• Star

• Ring

• Mesh

Which one is not the correct accommodation bit rates for SDH (STM-1)

• 2.048 mbps x 63 nos

• 34 mbps x 3 no.

• 2 x 34 mbps + 21 nos of 2 mbps

• 2 x 34 mbps + 42 nos of 2 mbps

STM-1 multiplexes inputs with different periods of bits into a single period of

• 6.4 ns

• 125 micro second

• 1 second

• 5 seconds

In the standard STM-1 frame structure 3 x TUG-3 forms VC4, what each TUG-3 contains:

• 21 E1s

• 63 E1s

• POH

• RSOH

What is the typical core diameter of single mode optical fibre?

• 125 microns

• 50-62.5 microns

• 9 microns

• 100 microns

For long haul transmission in Indian Railways, which type of fibre is preferred?

• Multimode

• Single-mode

• Plastic fibre

• Free-space optics