Network Cables and Connectors

Twisted Pair Cable

⭐ CCST GOLD LINE

Twisted Pair Cable = Copper wires twisted together to reduce interference

1️⃣ Twisted Pair Cable (MOST COMMON)

A twisted pair cable is made of pairs of copper wires twisted together.

👉 Twisting reduces Electromagnetic Interference (EMI), which improves signal quality.

Twisted Pair Cable Structure

🔹 Types of Twisted Pair

Type	Full Form	Shielding	Use
UTP	Unshielded Twisted Pair	❌ No	Home, office LAN
STP	Shielded Twisted Pair	✅ Yes	High-interference areas

UTP vs STP Cable

🔹 Categories of Twisted Pair (VERY IMPORTANT)

Category	Speed	Distance
Cat5	100 Mbps	100 m
Cat5e	1 Gbps	100 m
Cat6	1–10 Gbps	100 m
Cat6a	10 Gbps	100 m
Cat7	10+ Gbps	100 m

📌 Most used today:
✅ Cat6 / Cat6a

🔹 Where Twisted Pair is Used

PC ↔ Switch
Router ↔ Switch
LAN networks
Ethernet connections

🔹 Pros & Cons

✅ Advantages

Cheap
Easy to install
Flexible

❌ Disadvantages

Limited distance (100 m)
Interference (especially UTP)

🧠 CCST Memory Trick

Twisted pair = LAN cable
Cat6 = modern standard
STP = better against interference

Coaxial Cable

⭐ CCST GOLD LINE

Coaxial Cable = Single copper core with heavy shielding for noise protection

2️⃣ Coaxial Cable (OLD BUT IMPORTANT)

A coaxial cable consists of a single copper core surrounded by insulation and shielding.

👉 Heavy shielding provides better protection from noise compared to twisted pair cables.

Coaxial Cable Structure

🔹 Structure of Coaxial Cable

Copper core – carries the signal
Insulator – separates core and shield
Metal shield – blocks interference
Outer jacket – physical protection

Coaxial Cable with Connectors

🔹 Where Coaxial Cable is Used

Cable TV
Old Ethernet (10Base2, 10Base5)
CCTV cameras
Broadband cable internet

Coaxial Cable Examples

Coaxial Network Connectors

🔹 Pros & Cons

✅ Advantages

Better noise resistance than twisted pair
Strong and stable signal

❌ Disadvantages

Bulky
Expensive
Not flexible
Mostly replaced by Ethernet & fiber

🧠 CCST Memory Trick

Coaxial = Cable TV cable
Strong shielding = less noise
Old Ethernet used coax

Fiber Optic Cable

⭐ CCST GOLD LINE

Fiber Optic Cable = Uses light instead of electricity for data transmission

3️⃣ Fiber Optic Cable (FASTEST & FUTURE)

A fiber optic cable transmits data using light signals (laser or LED) instead of electrical signals.

📌 Data travels as light pulses 💡
👉 This makes fiber extremely fast and reliable

Fiber Optic Cable Anatomy

Fiber Optic Cable Components

🔹 Types of Fiber Optic Cable

Type	Core Size	Distance	Use
Single-Mode (SMF)	Thin	100+ km	ISP, Internet backbone
Multi-Mode (MMF)	Thick	≤ 2 km	Data centers

Single-Mode vs Multi-Mode Fiber

🔹 Where Fiber Optic Cable is Used

Internet backbone
ISPs
Data centers
Long-distance networks

Fiber Optic Cable Example

🔹 Pros & Cons

✅ Advantages

Extremely high speed (Gbps – Tbps)
Very long distance
Immune to EMI (electromagnetic interference)
Highly secure

❌ Disadvantages

Expensive
Fragile
Difficult to install and repair

🧠 Exam Tip

If the question mentions:
Long distance + High speed → ✅ Fiber Optic Cable

RJ-45 Connector (Ethernet)

⭐ CCST GOLD LINE

RJ-45 = Standard connector used for Ethernet LAN cables

1️⃣ RJ-45 Connector (ETHERNET)

An RJ-45 connector is used with Ethernet twisted pair cables to connect networking devices.

📌 Key points:

Has 8 pins
Used for wired LAN connections

RJ-45 Ethernet Connector

🔹 Used With

Cat5 / Cat6 / Cat6a cables
PCs
Switches
Routers

RJ-45 Ethernet Patch Cable

🔹 Wiring Standards (Extra Knowledge)

T568A
T568B (most common)

📌 Both standards work, but T568B is widely used in practice

RJ-45 Pinout (T568A)

🔹 Simple Example

🧠 Network connection example:

PC ── RJ-45 ── Switch ── RJ-45 ── Router

🧠 CCST Memory Trick

RJ-45 = Ethernet connector
8 pins = LAN cable
T568B = most common

RJ-11 Connector (Telephone)

⭐ CCST GOLD LINE

RJ-11 = Standard connector used for telephone lines

2️⃣ RJ-11 Connector (TELEPHONE)

An RJ-11 connector is mainly used for telephone and DSL connections.

📌 Key points:

Has 4 or 6 pins
Smaller in size than RJ-45

RJ-11 Telephone Connector

🔹 Used With

Landline phones
DSL modem phone line

RJ-11 vs RJ-45

🔹 Comparison (Exam Favorite)

Feature	RJ-45	RJ-11
Pins	8	4 / 6
Use	Ethernet	Telephone
Size	Bigger	Smaller

🧠 CCST Memory Trick

RJ-45 = Internet / LAN
RJ-11 = Telephone / DSL
RJ-11 always smaller

Coaxial Connector

⭐ CCST GOLD LINE

Coaxial Connectors are used to connect coaxial cables for TV, internet, and surveillance systems

3️⃣ Coaxial Connector

A coaxial connector is used with coaxial cables to provide stable signal transmission, especially for video and broadband signals.

🔹 Types of Coaxial Connectors

Type	Used For
BNC	CCTV cameras, old Ethernet networks
F-Type	Cable TV, cable modem, broadband internet

BNC Coaxial Connector

F-Type Coaxial Connector

🔹 Used With

Coaxial cables
Television (Cable TV)
Cable internet / modem
CCTV surveillance systems

Coaxial Connectors in Networking

🧠 CCST Memory Trick

BNC = CCTV & old networks
F-Type = TV & cable internet
Coax connector = round metal pin

Fiber Optic Connectors

⭐ CCST GOLD LINE

Fiber optic connectors connect fiber cables to networking devices for high-speed, long-distance communication

4️⃣ Fiber Optic Connectors

Fiber optic connectors are used to terminate fiber optic cables and connect them to devices like switches, routers, and ISP equipment.

🔹 Common Types of Fiber Optic Connectors

Connector	Shape	Use
SC	Square	Networks
LC	Small	Data centers
ST	Round	Old fiber networks
FC	Threaded	Telecom environments

Fiber Optic Connector Types

🔹 Used With

Fiber optic cables
Network switches
Routers
ISP equipment

🧠 CCST Memory Trick

SC = Square connector
LC = Small, data centers
ST = Old, round connector
FC = Threaded, telecom