AVIXA Updated CTS Exam Questions and Answers by clayton

A Request for Information (RFI) is a document used to clarify project design issues. RFIs are typically issued when there is a need for additional information or clarification on specific aspects of the project design. This helps ensure that all parties have a clear understanding of the requirements and can proceed with accurate and consistent implementation. RFIs are commonly used in construction and AV projects to address uncertainties or discrepancies in the design documents.

The fourth cable from the left (black coaxial cable)

The coaxial cable (the fourth cable from the left) is least susceptible to electromagnetic interference (EMI) due to its construction, which includes a central conductor surrounded by a shielding layer. This shielding, often made of metal foil or braided wire, effectively blocks external electromagnetic fields, preventing them from interfering with the signal.

Here’s a breakdown of each cable type:

Twisted Pair Cable (first from the left): Susceptible to EMI unless shielded, though twisted pairs can reduce interference somewhat.

Multi-conductor Cable (second from the left): More susceptible to EMI, depending on the shielding used.

Fiber Optic Cable (third from the left): Immune to EMI, as it transmits data as light rather than electrical signals.

Coaxial Cable (fourth from the left): Highly resistant to EMI due to its shielding, making it ideal for environments with significant electrical interference.

CTS Technology Specialist ReferenceThe CTS curriculum discusses the benefits of coaxial cable in environments with potential EMI due to its robust shielding properties. It’s often recommended for AV installations where EMI is a concern. Fiber optic, which is not affected by EMI, is another choice, but coaxial is traditionally favored for certain AV applications due to cost and compatibility.

The microphone in the setup may require phantom power to operate. Phantom power is a DC voltage (usually 48V) supplied through the microphone cable to power condenser microphones. Without phantom power, a condenser microphone will not function, resulting in no audio being passed through the system. Since the drawing shows a microphone connected to a digital audio transmitter, it's likely a condenser microphone, and if it isn't receiving phantom power, this would be the most probable cause of the system not passing audio.

During an initial site survey, understanding the overall scope of the AV solution provides the foundational insight needed for designing a system that meets client requirements. This ensures alignment with objectives and informs subsequent phases of the project.

CTS Technology Specialist ReferenceThe CTS curriculum advises focusing on the AV solution scope to guide design and implementation processes effectively, ensuring client needs are addressed.