Pass the AVIXA AVIXA Communications Certifications CTS Questions and answers with CertsForce

When upgrading an AV system in a boardroom and adding control of the lights and shades to the control panel, the most relevant information to gather is the communications protocols. Understanding the protocols used by the lighting and shading systems ensures compatibility with the AV control panel, enabling seamless integration. Axis Technology Specialist documentation highlights the necessity of knowing communication protocols to ensure different systems can interact correctly and be managed from a unified control interface.

Mic-level, line-level audio, and relay control are all low-voltage, low-noise sensitive signal types. They can typically share a common cable pathway with proper shielding. RF and loudspeaker cables, on the other hand, can cause interference and should be routed separately.

“Group cables by signal type to reduce interference: low-voltage control and audio together; high-power (loudspeaker or AC) separately.”

— CTS Exam Guide, Cabling and Signal Management Chapter

The image shows a dynamic microphone, which works through electromagnetic induction. In a dynamic microphone, sound waves cause the diaphragm to move, which in turn moves a coil of wire within the magnetic field of a magnet. This movement generates an electrical signal that corresponds to the sound. The visible components, such as the diaphragm, coil, and magnet, are characteristic of a dynamic microphone’s internal structure.

CTS Technology Specialist Reference

The CTS curriculum details the workings of various microphone types, explaining that dynamic microphones are durable and suitable for live sound due to their ability to handle high sound pressure levels.

The RS-232 standard is a common serial communication protocol often used for connecting and controlling various AV devices. It typically employs a DB9 connector, which is illustrated in Option C. The DB9 connector is a 9-pin D-sub connector, widely used in RS-232 connections due to its reliable performance in transmitting serial data.

Here’s an overview of the connector options in the image:

Option A: This is an RJ-45 connector, commonly used for Ethernet networking (data communication), not for RS-232.

Option B: This is a VGA connector, often used for video signals, typically between computers and monitors.

Option C: This is a DB9 (DE-9) connector, which is most commonly associated with RS-232 serial connections.

Option D: This is an XLR connector, generally used for audio signals, especially in professional audio applications.

CTS Technology Specialist Reference

In AV systems integration, RS-232 is frequently employed for control and communication between devices such as projectors, displays, and control processors. According to CTS training materials, the DB9 connector is the most recognized form of connection for RS-232 due to its reliability and ease of integration in various AV systems.

The only cable in the image capable of Ethernet transmission over 1 mile (1.6 km) is C, which is fiber optic cable.

???? Why?

According to the AVIXA CTS Exam Guide and industry standards such as IEEE 802.3:

Twisted pair cables (like A and B) are limited to 100 meters (328 feet) for Ethernet.

Coaxial cable (D) is typically not used for long-distance Ethernet and has high attenuation over distance.

Fiber optic cable (C) can support data transmission over kilometers depending on the type (single-mode or multi-mode). For 1 mile (1.6 km), single-mode fiber is ideal.

From the CTS Exam Guide, 5th Edition – Chapter 3: Networking, it explains:

"For high-speed and long-distance data communication, fiber optic cabling is essential. Single-mode fiber can transmit Ethernet over distances exceeding 10 km, making it the only practical choice for transmissions over 1 mile."

Additionally:

Fiber is immune to electromagnetic interference.

Provides higher bandwidth and lower attenuation compared to copper-based cables.

Benchmarking involves comparing the client’s system needs or expectations with other successful installations. This exposes clients to possibilities they may not have considered and helps refine their vision.

“Benchmarking showcases what’s possible and helps clients visualize their own needs in a more informed way.”

— CTS Exam Guide, Design Consultation and Benchmarking Practices

Energy Efficient Ethernet (EEE) must be disabled in a Dante network. EEE can cause latency and jitter issues which are detrimental to audio streams. Dante is designed for low-latency, high-reliability audio networking, and EEE's power-saving mechanisms, which involve putting links to sleep, can interfere with the consistent data transmission required by Dante networks. Disabling EEE ensures stable and uninterrupted network performance for audio applications.

The systems integration phase is when devices are installed and configured together. Verifying loudspeaker transformer taps during this phase ensures that each speaker receives the correct power level, which is critical for achieving uniform audio coverage and system performance.

“Loudspeaker transformer taps should be verified during the systems integration phase to ensure proper audio balance and coverage before final verification.”

— AVIXA Standard – AV System Performance Verification (ANSI/INFOCOMM 10:2013)

Preventive maintenance is planned maintenance conducted at regular intervals to ensure system reliability and prevent issues before they occur, rather than in response to system failures.

CTS Technology Specialist Reference

CTS training on maintenance highlights the importance of scheduled preventive maintenance to keep systems operating smoothly and extend equipment lifespan.

Ceiling microphones are sensitive to air handling noise. Coordination with HVAC is crucial to avoid placing microphones near noisy vents or ducts, which can cause unwanted ambient noise and reduce intelligibility.

“Microphones should be kept clear of HVAC vents and diffusers. Coordination with mechanical trades prevents noise contamination.”

— CTS Exam Guide, Audio and Integration Planning Chapter