350-401 Question #882: Real Exam Question with Answer & Explanation

Question

EIRP (Effective Isotropic Radiated Power) is the actual amount of signal leaving the antenna. It is a measurement value in db and is based on which three components? (Choose three.)

Options

• ATransmit Power
• BRSSI
• CCable Loss
• DAntenna Gain
• ESNR

Explanation

EIRP Explained

EIRP represents the total effective power radiated from an antenna system and is calculated using the formula: EIRP = Transmit Power (A) - Cable Loss (C) + Antenna Gain (D). Transmit Power is the signal strength output from the radio/access point, Cable Loss accounts for signal degradation through cables and connectors, and Antenna Gain reflects how much the antenna focuses and amplifies the signal in a specific direction. RSSI (B) is incorrect because it measures received signal strength at the destination, not transmitted power - it's a reception metric, not a transmission component. SNR (E) is also incorrect because it describes the ratio of signal to background noise, which is a quality measurement rather than a component of radiated power.

💡 Memory Tip: Think of EIRP as a "Power Budget" - you start with Transmit Power, subtract what you lose (Cable Loss), and add what you gain (Antenna Gain). The formula T - C + G = EIRP keeps the three components clear. If a term measures what's received rather than transmitted, it doesn't belong in EIRP.

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