CCNA | நெட்வொர்க் கேபிள்களின் அடிப்படை (Basic of Network Cables) | பகுதி 1 | விளக்கம்

CCNA – Network Cables (Copper & Fiber)
Today we are going to discuss Network Cables.
Network cables are the physical medium used to transmit data between devices.
There are two main types:
1️⃣ Copper Cables
2️⃣ Fiber Optic Cables

🔶 1️⃣ Copper Cables
📌 What is Copper Cable?
Copper cable transmits data using electrical signals.
It is widely used in LAN networks.

📌 Types of Copper Cables
1️⃣ Twisted Pair Cable (Most Common)
Used in Ethernet networks.
Two main types:
• UTP (Unshielded Twisted Pair)
• STP (Shielded Twisted Pair)
The wires are twisted to reduce electromagnetic interference (EMI).

📌 Categories of Ethernet Cables
Category Speed Max Distance
Cat5e 1 Gbps 100 meters
Cat6 1 Gbps (10 Gbps up to 55m) 100 meters
Cat6A 10 Gbps 100 meters
Cat7 10 Gbps 100 meters
CCNA exam commonly refers to Cat5e and Cat6.

📌 Maximum Distance
Copper Ethernet cable supports:
Maximum 100 meters per segment
Why?
Because electrical signals degrade over long distances (attenuation).

📌 Advantages of Copper
• Low cost
• Easy to install
• Flexible
• No special tools required

📌 Disadvantages of Copper
• Limited to 100 meters
• Susceptible to EMI (Electromagnetic Interference)
• Lower bandwidth compared to fiber

📌 Real-World Usage
• Office LAN connections
• PC to Switch
• Access Switch connections

🔷 Fiber Optic Cable
📌 What is Fiber?
Fiber optic cable transmits data using light signals, not electricity.
It uses glass or plastic core.

📌 Why Fiber is Faster?
Because:
• Light travels faster than electrical signals
• No electromagnetic interference
• Much lower signal loss

📌 Types of Fiber
Multimode Fiber (MMF)
• Used for shorter distances
• Common in campus networks
• Uses LED light source
• Distance: Up to ~2 km (depending on type)
Common standards:
• OM1
• OM2
• OM3
• OM4

Single Mode Fiber (SMF)
• Used for long distances
• Used in WAN / ISP networks
• Uses laser light source
• Distance: 10 km to 100+ km

📌 Fiber Structure
Fiber cable has:
• Core
• Cladding
• Buffer coating
• Jacket
Light travels inside the core using total internal reflection.

📌 Advantages of Fiber
• Very high bandwidth
• Long distance support
• No EMI
• More secure (hard to tap)

📌 Disadvantages of Fiber
• More expensive
• Fragile compared to copper
• Requires specialized tools
• Skilled installation needed

🔍 Copper vs Fiber – Technical Comparison
Feature Copper Fiber
Signal Type Electrical Light
Max Distance 100m KM range
Speed Up to 10 Gbps 100+ Gbps
EMI Affected Not affected
Cost Low High
Installation Easy Skilled required


🎤 CCNA – Cable Diagrams, Connectors & Optical Modules

🔶 Cable Diagrams Explanation
🧵 Twisted Pair Cable Structure (Copper)
Inside a standard Ethernet cable (Cat5e/Cat6), we have:
• 8 copper wires
• Arranged as 4 twisted pairs
• Each pair reduces electromagnetic interference (EMI)
Internal Structure:
Outer Jacket
└── 4 Twisted Pairs
├── Pair 1 (Blue / White-Blue)
├── Pair 2 (Orange / White-Orange)
├── Pair 3 (Green / White-Green)
└── Pair 4 (Brown / White-Brown)
Twisting prevents signal interference between pairs.

🔷 Fiber Cable Structure
Fiber cable has multiple layers:
Outer Jacket
└── Buffer Coating
└── Cladding
└── Core (Light travels here)
• Core → Carries light
• Cladding → Reflects light back to core
• Buffer → Protection layer
Light travels using Total Internal Reflection.

🔌 Connector Types
Now let’s discuss physical connectors.

🔹 RJ45 (Copper Connector)
Used for Ethernet cables.
• 8 pins
• Used with Cat5e, Cat6
• Used in LAN connections
RJ45 connects:
• PC to Switch
• Switch to Router
• Firewall to Switch
Very common in office networks.

🔹 LC Connector (Fiber)
• Small form-factor connector
• Used in modern switches and SFP modules
• Common in data centers
Looks like a small push-in connector.

🔹 SC Connector (Fiber)
• Larger square connector
• Older fiber deployments
• Used in telecom racks
Push-pull type.

🔹 ST Connector (Fiber)
• Round connector
• Twist-lock mechanism
• Mostly older installations
Rare in modern enterprise setups.

🌟 Advanced Optical Concepts
Now we move to professional-level networking.

🔹 What is SFP?
SFP = Small Form-factor Pluggable
Used to connect fiber cables to switches.
Supports:
• 1 Gbps
Inserted into switch SFP port.

🔹 SFP+
Upgraded version.
Supports:
• 10 Gbps
Used in:
• Distribution layer
• Core switches

🔹 QSFP
QSFP = Quad Small Form-factor Pluggable
Supports:
• 40 Gbps
• 100 Gbps (QSFP28)
Used in:
• Data centers
• Core backbone networks

🔹 Types of Optical Modules
Based on distance:
• SX → Short range (MMF)
• LX → Long range (SMF)
• SR → Short range
• LR → Long range
• ER → Extended range

🔹 Real Enterprise Design Example
Access Layer:
• Copper (RJ45)
• 1 Gbps
Distribution Layer:
• SFP+ 10G fiber
Core Layer:
• QSFP 40G / 100G fiber

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