Objectives:. Transmission media and cabling LAN Physical Layer Ethernet WAN Technologies Network Devices. Chapter 2: Physical Layer. Guided Transmission Data. Magnetic Media Twisted Pair Coaxial Cable Fiber Optics. Twisted Pair. (a) Category 3 UTP. (b) Category 5 UTP.
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Chapter 2: Physical Layer
(a) Category 3 UTP.
(b) Category 5 UTP.
A coaxial cable.
(a) Side view of a single fiber.
(b) End view of a sheath with three fibers.
(a) Three examples of a light ray from inside a silica fiber impinging on the air/silica boundary at different angles.
(b) Light trapped by total internal reflection.
Convection currents can interfere with laser communication systems.
A bidirectional system with two lasers is pictured here.
The use of both analog and digital transmissions for a computer to computer call. Conversion is done by the modems and codecs.
(a) A binary signal
(b) Amplitude modulation
(c) Frequency modulation
(d) Phase modulation
A typical ADSL equipment configuration.
Only Ethernet versions are growing
2- IEEE 802.3ab
1- IEEE 802.3z
2- Copper Cabling Specifications
1- Fiber Cabling Specifications
Layer 1 network devices: Repeaters, HubsLayer 2 network devices: Bridges, Switches, modems, NICsLayer 3 network devices: Repeaters, Hubs
A repeater solves the problem of too many nodes and not enough cable; cleans, amplifies, and resends a signal that is weakened by long cable length.
Bridges filter traffic by looking at MAC addresses.
Designed to create two or more LAN segments, each of which is a separate collision domain
A Switch is a Multiport Bridge
Switches Combine the connectivity of a hub with the traffic regulation of a bridge on each port