Mixed Deck — All DCI Topics Flashcards

Which fall protection measure is required when working on a ladder that extends more than 4 feet above a lower level?

Answer: The ladder must be secured at the top or bottom to prevent movement

OSHA requires ladders to be secured at the top, bottom, or both to prevent slipping or tipping when extended above 4 feet.

What is the TIA-568 maximum allowable permanent link length for Category 6 horizontal cabling?

Answer: 90 meters

TIA-568 limits the permanent link (from telecommunications outlet to patch panel) to 90 meters, with the remaining 10 meters allocated for patch cords.

What is the purpose of a Job Hazard Analysis (JHA) performed before starting a cabling installation?

Answer: To identify potential hazards and establish safe procedures for each task

A JHA systematically identifies hazards associated with each job task and establishes safe work procedures to mitigate those risks.

When using a visual fault locator (VFL) on a fiber, a bright red glow is visible through the jacket. What does this indicate?

Answer: A tight bend, break, or macro-bend causing light to escape at that location

A VFL emits visible red light; if it escapes through the jacket it means the fiber is losing light at that point due to a bend, break, or mechanical fault.

Which method is used to join fiber optic cables in an outside plant environment where a permanent, low-loss connection is required?

Answer: Fusion splice

Fusion splicing provides the lowest loss and most durable permanent joint for outside plant applications by welding the glass fibers together.

While using an extension ladder to access a ceiling pathway, what is the proper safety protocol regarding the ladder's position?

Answer: The top of the ladder must extend at least three feet above the point of contact.

A key rule for extension ladder safety is that the ladder must extend at least three feet (about 1 meter) above the upper landing surface to provide a secure handhold for climbing on and off.

According to the ANSI/TIA-569 standard, which of the following is a primary requirement for a Telecommunications Room (TR)?

Answer: The room must be dedicated solely to telecommunications functions.

The ANSI/TIA-569 standard specifies that a Telecommunications Room must be dedicated to the telecommunications function and not contain equipment unrelated to that purpose. False ceilings are not recommended, location should be centralized, and a minimum of two dedicated 20A circuits are required.

What test verifies that each pair in a copper cable has approximately the same propagation delay?

Answer: Propagation delay skew

Propagation delay skew measures the difference in signal travel time between the fastest and slowest pairs, which must be within 45 ns for Cat6/6A.

Which TIA standard specifies the color coding of optical fibers within a cable sheath?

Answer: ANSI/TIA-598-D

ANSI/TIA-598-D defines the color-coding scheme for optical fiber cables, ensuring consistent fiber identification across installations.

When running cable through a ceiling plenum, which cable jacket rating is required?

Answer: CMP (Communications Multipurpose Plenum)

CMP-rated (plenum-rated) cable must be used in ceiling plenum spaces because it has a low-smoke, flame-retardant jacket meeting NFPA 90A requirements.

Which cable stripping technique is recommended to avoid damaging the conductors inside a UTP cable?

Answer: Use a cable stripper set to the correct depth to remove only the outer jacket

A properly adjusted cable stripper removes only the outer jacket without nicking the insulation or conductors beneath, which could cause continuity faults.

When testing fiber optic cable with an OTDR, what does a 'ghost' or 'echo' event indicate?

Answer: A reflective event appearing beyond the actual end of the fiber due to multiple reflections

A ghost event is a false reflection that appears beyond the fiber end caused by a high-reflectance event earlier in the trace bouncing multiple times.

What is the primary consideration when implementing changes to copper installation?

Answer: Impact assessment and change management

Impact assessment and proper change management ensure that modifications do not introduce unexpected problems or service disruptions.

What is the minimum bend radius typically allowed for a standard single-mode fiber optic cable during installation?

Answer: 20 times the cable diameter

The minimum bend radius during installation is typically 20 times the cable diameter to prevent microbending losses and physical damage.

What does the acronym MER stand for in data center pathways and spaces terminology?

Answer: Main Equipment Room

MER stands for Main Equipment Room, which is the central space in a data center that houses core network and computing equipment.

What is the maximum allowable pair untwist at a termination point for Category 6 copper cabling?

Answer: 1/4 inch (6 mm)

ANSI/TIA-568 limits untwisting to no more than 1/4 inch (6 mm) at terminations to maintain crosstalk performance.

Why should a wire management comb (cable comb) be used before terminating UTP cable at a patch panel?

Answer: To untwist and spread conductors in pair order to reduce the termination time and maintain pair organization

A cable comb separates, straightens, and fans out pairs in the correct order so conductors can be placed into the patch panel's IDC slots quickly and accurately.

What is the proper way to lift heavy spools of cable?

Answer: Lift with your legs

Lifting with your legs, not your back, is crucial for preventing injuries when handling heavy objects like cable spools. This technique utilizes the stronger muscles in your legs and glutes, keeping your back straight and reducing strain on your spinal column. It ensures proper body mechanics, minimizing the risk of muscle strains, sprains, or more severe back injuries.

What does OSHA 29 CFR 1926.416 require that directly impacts telecommunications cable installers working on construction sites?

Answer: Protection from electrical hazards near exposed energized parts

OSHA 29 CFR 1926.416 requires workers to be protected from contact with exposed energized conductors, which applies when installers work near electrical systems.

Which Cat 6A cable construction is required when installed in a plenum air-handling space?

Answer: CMP-rated (plenum) jacket

CMP (Communications Multipurpose Plenum) rated cable is required by NEC Article 800 for installation in plenum air-handling spaces.