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Wireless Systems Design and Infrastructure Flashcards

7 cards from real RCDD practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. According to ANSI/TIA-4965, what is the recommended maximum distance between wireless access point (WAP) mounting locations and the nearest telecommunications outlet in a distributed antenna or WAP deployment?

    Answer: 30 meters (100 ft)

    ANSI/TIA-4965 recommends WAP locations be served by cabling no longer than 30 meters (100 ft) from the telecommunications outlet to ensure adequate PoE delivery and signal quality.

  2. Which IEEE standard defines Power over Ethernet (PoE) at a maximum of 15.4 watts of power delivered to a powered device (PD)?

    Answer: IEEE 802.3af

    IEEE 802.3af (PoE) delivers a maximum of 15.4 W at the PSE (12.95 W at the PD), which is the original PoE standard.

  3. When designing in-building wireless (IBW) systems, a Distributed Antenna System (DAS) is primarily used to:

    Answer: Improve cellular and wireless coverage in areas with weak or no signal

    A DAS distributes RF signals from a central source through remote antenna units to improve wireless and cellular coverage throughout a building.

  4. In wireless LAN design, what term describes the overlapping coverage area between two adjacent access points, typically set at 15–20% overlap, to enable seamless roaming?

    Answer: Cell overlap

    Cell overlap (15–20%) between adjacent WAPs ensures a client device can roam seamlessly without dropping the connection before associating with the next AP.

  5. Which frequency band is most susceptible to absorption by walls and physical obstructions in an indoor wireless deployment?

    Answer: 5 GHz

    The 5 GHz band has shorter wavelengths that are more readily absorbed and attenuated by walls and obstructions compared to 2.4 GHz, reducing range indoors.

  6. When documenting a wireless site survey for an RCDD project, which measurement is used to quantify the ratio of the desired signal strength to the background noise level?

    Answer: SNR (Signal-to-Noise Ratio)

    SNR (Signal-to-Noise Ratio) measures the difference between the desired signal level and the noise floor, directly indicating link quality for wireless communications.

  7. Per BICSI TDMM guidelines, what minimum cable category is recommended to support IEEE 802.3bt (Type 4, 90W) PoE for high-power WAP installations?

    Answer: Category 6A

    Category 6A is recommended for IEEE 802.3bt 4-pair PoE because its larger conductors and lower DC resistance reduce heat buildup during high-power delivery.

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Wireless Systems Design and Infrastructure Flashcards — RCDD Study Cards with Answers