3.2 Network Cables Flashcards by Miranda Mandadi Laxman

What is the most common cable type used in wired Ethernet networks?

Twisted pair copper cable.

This type of cable is widely used due to its effectiveness and cost-efficiency.

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Why are the wires in twisted pair Ethernet cables twisted together?

To prevent interference and distinguish real signals from noise.

Twisting the wires helps to minimize crosstalk and electromagnetic interference.

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How do twisted pairs help reduce electromagnetic interference?

Each wire pair has a different twist rate that helps the receiver filter out noise.

This design enhances the cable’s performance in noisy environments.

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What type of interference do twisted pair cables primarily reduce?

Electromagnetic interference (EMI).

EMI can disrupt signal quality, making twisted pair cables essential for reliable communication.

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Do Ethernet cables have an inherent speed rating?

No, the signals sent over the cable determine speed.

The performance is influenced by the cable category and the networking equipment.

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Where is the minimum cable category for an Ethernet standard defined?

In the IEEE 802.3 standard.

This standard outlines the specifications for Ethernet technologies.

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What minimum cable category is required for Gigabit Ethernet (1000BASE-T)?

Category 5e.

Category 5e cables support speeds up to 1 Gbps over short distances.

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What minimum cable category is required for 10 Gigabit Ethernet (10GBASE-T)?

Category 6 or Category 6A.

These categories are designed to handle higher frequencies and data rates.

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Where can you usually find the cable category information?

Printed on the cable jacket.

This labeling helps users identify the specifications of the cable.

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What are the two main components of a coaxial cable?

An inner conductor for the signal
An outer shield for protection

The design of coaxial cables allows for effective signal transmission with minimal interference.

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What is the purpose of the outer shield in coaxial cable?

To protect the signal from interference.

This shielding is crucial for maintaining signal integrity, especially in noisy environments.

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What is coaxial cable commonly used for today?

Cable modems
Digital cable for high-speed internet

Coaxial cables are still prevalent in telecommunications and broadcasting.

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What does UTP stand for?

Unshielded Twisted Pair.

UTP cables are widely used in networking due to their cost-effectiveness.

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How does UTP protect against interference?

By twisting the wire pairs without additional shielding.

This design helps to reduce crosstalk between pairs.

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What does STP stand for?

Shielded Twisted Pair.

STP cables include shielding to provide additional protection against interference.

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How does STP differ from UTP?

STP includes shielding to protect against interference.

This makes STP more suitable for environments with high electromagnetic interference.

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Where can shielding be applied in STP cables?

Around all four wire pairs
Around each individual pair

The type of shielding affects the cable’s performance in various environments.

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How can you identify the type of shielding used in a cable?

By the abbreviations printed on the cable jacket.

This labeling provides essential information about the cable’s construction.

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What is a direct burial Ethernet cable used for?

Underground installation between buildings.

These cables are designed to withstand harsh environmental conditions.

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What features make direct burial STP cables suitable for underground use?

Waterproofing
Gel to repel water
Shielding
Grounding

These features ensure the cable remains functional and protected from moisture and interference.

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Why is shielding especially important for direct burial cables?

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To protect against interference and allow proper grounding.

This is crucial for maintaining signal quality in outdoor installations.

What is a plenum space in a building?

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The open space above a drop ceiling used for air circulation.

Plenum spaces are critical for HVAC systems and require special cable considerations.

Why are plenum-rated cables required in plenum spaces?

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To prevent the spread of fire, smoke, and toxic fumes.

These cables are made from materials that minimize fire hazards.

What materials are commonly used for plenum-rated cable jackets?

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Fluorinated ethylene polymer (FEP)
Low smoke PVC

These materials are designed to reduce smoke and toxic emissions in case of fire.

What risk do **non-plenum cables** pose in plenum spaces?

Rapid spread of fire, smoke, and toxic fumes. ## Footnote Using non-plenum cables in these areas can lead to serious safety hazards.

Which cable type is best for **high-interference environments**?

Shielded twisted pair (STP). ## Footnote STP cables provide additional protection against electromagnetic interference.

Which cable type is designed for **air-handling spaces**?

Plenum-rated cable. ## Footnote These cables are specifically engineered to meet safety standards in plenum areas.

Which cable type is designed for **underground installation**?

Direct burial STP cable. ## Footnote These cables are built to withstand harsh conditions and moisture.

What are **T568A** and **T568B**?

Ethernet cabling color standards that define wire-to-pin assignments for RJ45 connectors. ## Footnote These standards ensure proper connectivity in Ethernet networks.

Which organization defines the **T568A** and **T568B** standards?

The Telecommunications Industry Association (TIA) ## Footnote TIA is responsible for developing telecommunications standards.

In what document are the **T568A** and **T568B** standards found?

The ANSI/TIA-568 standard ## Footnote This document outlines the specifications for telecommunications cabling.

What connector type do **T568A** and **T568B** standards apply to?

RJ45 connectors ## Footnote RJ45 connectors are commonly used in Ethernet networking.

Why is **standardization** important in Ethernet cabling?

It ensures consistency, simplifies installation, and makes troubleshooting easier. ## Footnote Standardization helps maintain network reliability.

What problems can occur without standardized wiring?

Inconsistent installations and network connectivity issues. ## Footnote Non-standard wiring can lead to significant operational challenges.

Do **T568A** and **T568B** use different connectors?

No, both use the same RJ45 connector. ## Footnote The difference lies in the wiring color assignments.

How do **T568A** and **T568B** differ?

They use different color assignments for certain pins. ## Footnote This affects how cables are terminated at each end.

Which standard is more commonly used in the **United States**?

T568B ## Footnote T568B is preferred for most commercial installations.

Are **T568A** and **T568B** both valid standards?

Yes. ## Footnote Both standards are recognized and can be used effectively.

Why do organizations usually choose only one **wiring standard**?

To maintain consistency and avoid wiring issues. ## Footnote Consistency helps prevent connectivity problems.

Why is mixing **T568A** and **T568B** on opposite ends of a cable discouraged?

It can cause problems, especially with gigabit Ethernet networks. ## Footnote Mixing standards can lead to signal degradation.

What wiring issue can result from mixing standards on a single cable?

Improperly wired cables that may not function correctly. ## Footnote This can lead to network failures.

Which wire pairs are the same in both **T568A** and **T568B**?

* Blue pair (pins 4 and 5) * Brown pair (pins 7 and 8) ## Footnote These pairs maintain the same color coding in both standards.

What is the order of pins for **T568A** and **T568B**?

## Footnote These differences are crucial for proper cable termination.

Why is it easier to remember the differences between **T568A** and **T568B**?

Only four pins differ between the two standards. ## Footnote This simplicity aids in training and installation.

How can you identify whether a cable is wired using **T568B**?

Compare the visible wire color order in the RJ45 connector to the T568B color scheme. ## Footnote Visual inspection is a quick method for verification.

Where can color code guidance for both standards often be found?

On keystone jacks and other Ethernet jacks. ## Footnote This guidance helps ensure correct wiring during installation.

Why do **keystone jacks** display both T568A and T568B color schemes?

To guide proper wire termination during installation. ## Footnote This feature aids installers in maintaining standards.

Which Ethernet wiring standard is most commonly used in the **US**?

T568B. ## Footnote This standard is widely adopted in commercial settings.

Which standardization body is responsible for Ethernet cabling color codes?

TIA. ## Footnote TIA sets the standards for telecommunications cabling.

What is the best practice when wiring an Ethernet network?

Use the same wiring standard consistently throughout the installation. ## Footnote Consistency is key to ensuring network reliability.

3.2 Network Cables Flashcards

(50 cards)