SBCA Network Design 4

Question 1

What is the primary purpose of an uplink power control (UPC) system in a satellite network?

Accepted Answer

To compensate for atmospheric attenuation and maintain constant power flux density at the satellite

Answer

UPC automatically increases earth station transmit power during rain fade or atmospheric attenuation events to maintain a stable carrier level at the satellite transponder input.

Question 2

In satellite network design, what does 'transponder loading' refer to?

Accepted Answer

The aggregate power and bandwidth utilization relative to transponder capacity

Answer

Transponder loading describes how much of the transponder's available power and bandwidth is being consumed by carriers, typically expressed as a percentage of total capacity.

Question 3

Which access method is best suited for a satellite network where thousands of terminals send very short, infrequent data bursts?

Accepted Answer

ALOHA or slotted ALOHA random access

Answer

ALOHA-based random access is ideal for large populations of terminals with bursty, infrequent transmissions where assigning dedicated channels would waste most of the capacity.

Question 4

A satellite network planner must prevent interference between adjacent satellite systems. What is the primary coordination mechanism used internationally?

Accepted Answer

ITU Radio Regulations coordination procedures and interference criteria

Answer

The ITU Radio Regulations establish mandatory coordination procedures requiring satellite operators to coordinate with potentially affected networks before bringing a new satellite into service.

Question 5

In a DVB-RCS2 return link design, what determines the maximum number of terminals that can share a single return carrier?

Accepted Answer

The aggregate traffic demand relative to carrier symbol rate and coding efficiency

Answer

The carrier's total capacity (determined by symbol rate, modulation, and coding rate) must accommodate the aggregate traffic from all sharing terminals, setting the practical limit on terminal count.

(SBCA) Satellite Broadcasting and Communications Association Certification Practice Test

(SBCA) Satellite Broadcasting and Communications Association Certification Practice Test

SBCA Network Design 4