CWDP Channel Planning and RF Design 3

Question 1

What is the '20/40 MHz coexistence' mechanism defined in 802.11n for the 2.4 GHz band?

Accepted Answer

A protection mechanism that restricts 40 MHz operation when legacy or neighboring APs are detected on adjacent channels

Answer

A method to aggregate two 5 GHz radios for higher throughput

Answer

A technique allowing a single radio to operate on both 2.4 GHz and 5 GHz simultaneously

Answer

A channel bonding algorithm that alternates dynamically between 20 and 40 MHz width

Question 2

What does EIRP stand for, and why is it significant in RF channel design?

Accepted Answer

Effective Isotropic Radiated Power — it represents the total RF power output in a specific direction combining transmit power and antenna gain

Answer

Enhanced Interference Reduction Protocol — it governs how APs reduce mutual interference

Answer

Estimated Interference and Radiation Point — it marks the location of maximum interference risk

Answer

Equivalent Integrated RF Power — it measures cumulative power across all channels

Question 3

In channel planning, what does 'channel reuse distance' refer to?

Accepted Answer

The minimum physical separation required between APs using the same channel to prevent co-channel interference

Answer

The number of times a single channel can be licensed for concurrent use

Answer

The total number of channels available in a regulatory domain

Answer

The signal-to-noise ratio threshold at which channels are reused

Question 4

Which US regulatory body governs maximum transmit power levels and permitted channels for WLAN deployments?

Accepted Answer

FCC (Federal Communications Commission)

Answer

IEEE (Institute of Electrical and Electronics Engineers)

Answer

Wi-Fi Alliance

Answer

IETF (Internet Engineering Task Force)

Question 5

What is the primary channel planning risk when deploying 80 MHz channels in an 802.11ac/Wi-Fi 5 environment?

Accepted Answer

The number of non-overlapping channels drops significantly, greatly increasing co-channel interference risk

Answer

80 MHz channels are only available in the 2.4 GHz band

Answer

80 MHz channels are not supported by any 802.11ac clients

Answer

Regulatory agencies prohibit 80 MHz channel use indoors

Question 6

What channel planning consideration is uniquely critical when deploying APs across multiple floors in a multi-story building?

Accepted Answer

RF signals bleed vertically between floors, requiring different channel assignments on adjacent floors

Answer

Using identical channel assignments on all floors simplifies management and roaming

Answer

Deploying only 2.4 GHz radios on upper floors to reduce vertical interference

Answer

Maximizing transmit power to serve multiple floors from a single AP

Question 7

In 802.11ax (Wi-Fi 6), which technology allows a single AP to serve multiple clients simultaneously on the same channel, improving spectral efficiency in channel-constrained environments?

Accepted Answer

OFDMA (Orthogonal Frequency Division Multiple Access)

Answer

MIMO (Multiple Input Multiple Output)

Answer

OFDM (Orthogonal Frequency Division Multiplexing)

Answer

Transmit Beamforming