SBCA Digital Transmission 5

Question 1

What is the purpose of channel bonding in satellite broadband systems?

Accepted Answer

Combining multiple satellite transponders to increase single-user throughput

Answer

Channel bonding aggregates multiple satellite transponder channels to deliver higher throughput to a single user or hub terminal.

Question 2

In VSAT networks using MF-TDMA, what happens during a rain fade event affecting a terminal's uplink?

Accepted Answer

The network may assign more time slots or a more robust coding to compensate

Answer

MF-TDMA networks can compensate for rain fade by dynamically allocating more burst capacity or switching to a more robust modcod for the affected terminal.

Question 3

What is the function of a PCR (Program Clock Reference) in an MPEG-2 transport stream?

Accepted Answer

Providing a time reference to allow receivers to reconstruct the encoder's 27 MHz clock

Answer

PCR stamps allow the decoder to recover the encoder's 27 MHz system time clock, enabling accurate audio-video synchronization and buffer management.

Question 4

Which technique allows multiple uplink stations to share a single satellite transponder by transmitting at different frequencies simultaneously?

Accepted Answer

FDMA

Answer

FDMA (Frequency Division Multiple Access) assigns each uplink station a unique frequency slot within the transponder bandwidth for simultaneous access.

Question 5

In satellite digital transmission, what does the term 'occupied bandwidth' refer to?

Accepted Answer

The frequency range containing 99% of the total signal power

Answer

Occupied bandwidth is the frequency range that contains 99% of the total transmitted signal power, as defined by ITU regulations.

(SBCA) Satellite Broadcasting and Communications Association Certification Practice Test

(SBCA) Satellite Broadcasting and Communications Association Certification Practice Test

SBCA Digital Transmission 5