First layer of the OSI model covers the cabling and electrical signaling. The first layer of OSI model is the physical layer. The physical layer also decides the transmission mode and physical media.
layer 1, or the physical layer
functions of each layer in C7 signaling system
signal level
Layer 5 - Session layer
Ozone layer covers the earth. It acts as a blanket.
The Physical Layer of the OSI model is responsible for the mechanical, electrical, and functional interface between devices. It defines the physical means of sending data over network devices, including the transmission medium and signaling methods. This layer deals with the raw bitstreams and encompasses hardware elements such as cables, switches, and network interfaces.
signaling
The layer that covers Earth's surface is called the crust. It is the outermost and thinnest layer of the Earth, ranging from about 5 to 70 kilometers thick beneath the oceans and continents, respectively.
atmosphere
The atmosphere.
The atmosphere.
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