VDV Network Systems Integration 5 — Questions and Answers
Question 1: Which grounding standard must be followed when installing telecommunications systems in commercial buildings in the US?
- TIA-607 (Correct answer)
- NEC Article 800
- IEEE 802.3
- ANSI/TIA-568
Correct answer: TIA-607
TIA-607 (Commercial Building Grounding and Bonding Requirements for Telecommunications) specifies the grounding and bonding infrastructure for telecommunications systems.
Question 2: What is the minimum bend radius for a standard Cat6 UTP cable during installation?
- 1 times the cable diameter
- 4 times the cable diameter (Correct answer)
- 8 times the cable diameter
- 12 times the cable diameter
Correct answer: 4 times the cable diameter
TIA-568 requires that Cat6 UTP cable maintain a minimum bend radius of 4 times the cable diameter during and after installation to prevent performance degradation.
Question 3: In an integrated AV/IT network, which protocol allows control systems to manage and monitor networked devices using a standardized interface?
- RTSP
- REST API over HTTP
- PJLink
- All of the above can be used depending on device type (Correct answer)
Correct answer: All of the above can be used depending on device type
Modern integrated AV/IT control systems use multiple protocols—RTSP for streaming, REST APIs for web-connected devices, and PJLink for projector control—depending on the device.
Question 4: What is the term for the unwanted signal coupling between adjacent wire pairs in a twisted-pair cable?
- Attenuation
- Crosstalk (Correct answer)
- Impedance mismatch
- Return loss
Correct answer: Crosstalk
Crosstalk is the electromagnetic interference that occurs when a signal in one wire pair induces an unwanted signal in an adjacent pair, degrading transmission quality.
Question 5: A technician installs an IP video surveillance system and needs to segment it from the corporate data network for security. What is the most appropriate solution?
- Install a separate physical network for cameras
- Place cameras on a dedicated VLAN with firewall rules (Correct answer)
- Use crossover cables to connect cameras to the NVR
- Disable QoS on the switch ports used by cameras
Correct answer: Place cameras on a dedicated VLAN with firewall rules
Creating a dedicated VLAN for IP cameras with appropriate firewall rules segments surveillance traffic while allowing management access, providing security without requiring separate physical infrastructure.
Question 6: What does an OTDR (Optical Time-Domain Reflectometer) measure in a fiber optic cable installation?
- The number of fiber strands in a cable
- Chromatic dispersion at each wavelength
- The location and magnitude of losses and reflections along the fiber (Correct answer)
- The power output of the optical transmitter
Correct answer: The location and magnitude of losses and reflections along the fiber
An OTDR sends a pulse of light into the fiber and analyzes the backscattered light to create a trace showing the location and magnitude of splices, connectors, bends, and breaks.
Question 7: When integrating a new building automation system (BAS) with an existing IP network, which factor is most critical to verify before integration?
- The color coding of BAS wiring
- Network bandwidth availability and IP address scheme compatibility (Correct answer)
- The physical location of BAS controllers
- Whether the BAS uses coaxial or fiber cabling
Correct answer: Network bandwidth availability and IP address scheme compatibility
Before integrating a BAS with an IP network, verifying available bandwidth for BAS traffic and ensuring IP address scheme compatibility prevents conflicts and ensures reliable communication.
VDV Network Systems Integration 5
Which grounding standard must be followed when installing telecommunications systems in commercial buildings in the US?