Network Design Flashcards
7 cards from real SBCA practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Network Design flashcards as text
What is the primary purpose of a network operations center (NOC) in a satellite broadcasting system?
Answer: To monitor, control, and troubleshoot the satellite network in real time
The NOC provides centralized real-time monitoring and management of all network elements including uplink equipment, transponder parameters, and remote terminals.
In DVB-S2 network design, what is the function of the 'physical layer header' (PL header)?
Answer: It identifies the modulation and coding format used in the frame
The DVB-S2 PL header is transmitted using BPSK and identifies the modulation, coding rate, and frame type so the receiver can demodulate the subsequent data frame correctly.
A satellite network uses frequency reuse to increase capacity. What is the most common technique for achieving frequency reuse on the same satellite?
Answer: Orthogonal polarization between adjacent beams
Orthogonal polarizations (horizontal/vertical or left/right circular) allow the same frequencies to be reused in adjacent beams while maintaining sufficient isolation to prevent interference.
What is the significance of the 'committed information rate' (CIR) in VSAT network service-level agreements?
Answer: It is the guaranteed minimum bandwidth available to a site at all times
CIR is the bandwidth guaranteed to a VSAT site regardless of network load, forming the baseline throughput commitment in a service-level agreement.
When designing a satellite uplink for TDMA operation, why must all remote terminals be precisely time-synchronized?
Answer: To prevent bursts from different terminals colliding in the same time slot
In TDMA, each terminal is assigned specific time slots; without synchronization, bursts would overlap causing collisions and data corruption at the hub receiver.
Which ITU region covers the contiguous United States for satellite frequency coordination purposes?
Answer: ITU Region 2
The contiguous United States falls within ITU Region 2, which covers North America, South America, and Greenland for frequency allocation and coordination purposes.
In a HTS (High-Throughput Satellite) network design, what is the primary technique used to achieve dramatically higher total system capacity compared to traditional FSS satellites?
Answer: Aggressive frequency reuse across many narrow spot beams
HTS satellites reuse the same frequency spectrum many times across dozens or hundreds of narrow spot beams, multiplying total capacity by the number of frequency reuse cycles.