Summary of "Lec-10: Types Of Cables in Computer Networks | Coaxial, twisted pair, fibre optic cable"
Main ideas / lessons conveyed
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Purpose of using different cables in computer networks: Cables connect devices and act as a transmission medium for sending data as signals (electrical or light).
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Exam focus (UGC Net / PSU-style questions): Emphasis is on understanding what the shorthand means, such as:
- 10/100 base T
- 10 base 2
- fx and on key concepts like bandwidth, distance limits, attenuation, collision domain, and OSI layer.
Concepts explained (with meaning of exam-relevant terms)
1) Unshielded Twisted Pair (UTP) Cable
Common variants mentioned
- 10 base T
- 100 base T
Meaning of the “10” / “100”
- 10 = 10 Mbps (10 megabits per second)
- 100 = 100 Mbps (100 megabits per second)
- Interpretation: how many bits can be transmitted per second → bandwidth
Meaning of “Base-band” vs “Broad-band”
- Base-band: only one signal can travel at a time on the wire.
- If one device transmits and another transmits simultaneously → collision occurs.
- Broad-band: multiple signals can move in parallel.
Meaning of “T”
- T = up to 100 meters (as explained for UTP)
- Beyond ~100 meters, the signal weakens due to attenuation.
Attenuation (distance-related signal weakening)
- Attenuation: signal strength becomes low after a certain distance, so it can’t travel further effectively.
Where such cables are used
- Used in Ethernet LANs (Local Area Networks)
- LAN distance is generally less than 10 km (as updated for modern offices)
- Examples of network technologies mentioned:
- Token Ring
- Token Bus
2) Coaxial Cable
Variants mentioned
- 10 base 2
- 10 base 5
Change from UTP to coaxial (main exam takeaway)
- Distance increases compared to UTP.
Meaning of “10 base 2” (as described)
- Base rate remains related to 10 Mbps, while distance is increased
- 10 base 2 corresponds to ~200 meters (as mapped in the explanation)
Attenuation-distance idea (as described)
- Attenuation occurs after a longer distance (the context mentions ~500 meters, though the phrasing is unclear).
3) Fibre Optic Cable
Signal type
- Uses light signals (no electrical signal)
Speed mentioned
- Speed of light ≈ 3 × 10⁸ meters/second
Data rate mentioned
- Example given: 100 Mbps (including “100 mega bits” reference)
Meaning of “fx”
- Interpreted as fibre channel (as stated)
Distance limit examples
- 100 base fx → up to ~1.9 km (~2 km)
- Also mentions 1000 base fx as another version
Additional exam-style questions and answers the video addresses
A) Where are cables used?
- Primarily in Ethernet
- Commonly used in LANs
- Used to connect devices
B) What is attenuation?
- After a particular distance, signal strength becomes low
- The signal energy weakens, so it cannot travel further effectively
C) Collision-related question (collision domain)
- Base-band idea: collisions can occur when multiple devices transmit simultaneously.
- Collision domain / maximum collisions:
- If n devices are connected on a shared wire, then the maximum collision domain involves all n devices
- Stated as: maximum collisions / participating devices = n
D) Can cables “filter”?
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Meaning of filtering (as framed): Example: If A sends data to D, “filtering” would mean deciding whether data should move further or not.
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Answer given: Cables cannot filter because they are pure hardware.
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They cannot inspect IP address or MAC address.
- They only provide physical connectivity and transmit signals.
- Where this happens in the OSI model: Cables work in the Physical Layer (Layer 1) — no software-level addressing.
Speaker / source identification
- Speaker: Not explicitly named in the subtitles
- Source/Channel name shown in subtitles: Gate Smashers
Category
Educational
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