Cable Fire Ratings: CM, CMR, & CMP

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Introduction
PVC has properties suitable for making up Ethernet cable jackets, but it also produces toxic smoke and fumes if caught in a fire.
However, cable jackets are not made equally. They have three basic fire ratings: CM, CMR, and CMP.
CM-rated cables are only for general use: patch cables, or cables installed inside the wall where the fire code is not strict.
CMR - rated cables are used between the floors of a multistory building.
CMP-rated cables are better than both CM and CMR. They are the most fire-resistant and should be used in plenum spaces where fire can easily start and spread.

Playlists:
Topology & cabling, & physical cabling structure:
https://www.youtube.com/watch?v=T5xQJ...
Ethernet Basics:
https://www.youtube.com/watch?v=FkH_J...
IPv4 Basics:
   • Tricks to five classes of IPv4  
OSI Model and related:
   • OSI Model