6.1.7 Fixed Wireless Internet Access Flashcards
What is a potential option for internet access in areas where wired broadband is not available?
Fixed wireless internet access
Fixed wireless internet access may be used in rural areas or older buildings where running new cables is problematic.
What type of satellite provides larger coverage areas for internet access?
Geostationary orbital satellite internet access
This system uses a satellite-based microwave radio system.
What are typical transfer rates for geostationary satellite internet access?
2 or 6 Mbps up and 30 Mbps down
Rates may vary between providers and access packages.
What is a major drawback of geostationary satellite internet access?
Increased latency
The signal travels thousands of miles, causing delays compared to terrestrial connections.
What is the round trip time (RTT) delay for accessing a website over DSL?
10–20 ms
This is the typical RTT delay for DSL connections.
What is the RTT delay for accessing the same website over a satellite link?
600–800 ms
This significantly higher delay impacts real-time applications.
What equipment does an ISP install for satellite internet connection?
Very Small Aperture Terminal (VSAT) satellite dish antenna
The dish is aligned with the orbital satellite for connectivity.
Where are geostationary satellites positioned?
Above the equator
This positioning allows the satellite to remain stationary relative to the dish.
What is the typical bandwidth range for Low Earth Orbital (LEO) satellite internet access?
5–220 Mbps
LEO satellites provide better bandwidth than geostationary satellites.
What is the RTT latency for Low Earth Orbital satellite internet access?
25–60 ms
This lower latency is an advantage over geostationary satellites.
What technology allows LEO satellites to connect with customer antennas?
Phased array technology
This technology minimizes mechanical realignment as satellites pass overhead.
What is a disadvantage of Low Earth Orbital satellite internet service?
The satellites move relative to the Earth’s surface
This requires the customer’s antenna to periodically realign.
What is the role of a Wireless Internet Service Provider (WISP)?
Uses ground-based, long-range, fixed-access wireless technology
WISPs connect customers to the internet via directional antennas.
What type of networking might a WISP use?
Wi-Fi type networking or proprietary equipment
WISPs can operate on licensed or unlicensed frequency bands.
What is a potential issue with fixed-access wireless links?
Maintaining an unobstructed line of sight
This is crucial for effective communication between antennas.
What external factors can adversely affect microwave radio links?
Snow, rain, high winds, and solar flares
These conditions can disrupt the signal quality.
