OV 3 - 1 Copyright © 2015 Logical Operations, Inc. All rights reserved. Unbounded Network Media ...

OV 3 - 1Copyright © 2015 Logical Operations, Inc. All rights reserved.

Unbounded Network Media

Wireless Networking Wireless Network Devices and Components Install a Wireless Network


OSI Model Location

Application7

Presentation6

Session5

Transport4

Network3

Data Link2

Physical1


Wireless Communication

Signals are transmitted over a distance without

the use of a physical medium


The IEEE 802.11 Standard

Standard Speed (Mbps) Frequency (Ghz)

Range (meters)

MIMO Streams

802.11a 54 5 20 1

802.11ac 433/channel 5 35 8

802.11b 11 2.4 100 1

802.11g 54 2.4 100 1

802.11n 150 2.4 or 5 70 4


Frequencies and Overlap of Wireless Channels

22.417

12.412

32.422

42.427

52.432

62.437

72.442

82.447

92.452

102.457

112.462

122.467

132.472

142.484

ChannelCenter Frequency (GHz)


Radio Networking

Signals are sent via RF waves


Broadcast Radio

Non-directional single frequency transmission


Spread Spectrum

Signal is sent over more than one frequency


Types of Spread Spectrum

OFDM DSSS


Infrared Transmission

Signals sent as infrared light pulses. Transmit at 300 GHz to 300,000 GHz. Receiver needs unobstructed view of sender. Signal can reflect off hard surfaces. Used for:

Remote control systems. Security sensors. Manufacturing sensors.


Bluetooth

30 meters


Microwave Transmission

Sender transmits electromagnetic signals

Receiver has an unobstructed view


Wireless Access Points

Device that provides a connection between wireless devices

WAP


Wireless Controllers

Provide wireless LAN management for multiple access points. Used in combination with the LWAPP. Can be a physical device or a software application. LWAPP is a protocol that controls multiple Wi-Fi wireless access points.


Wireless Bridges

Wireless Router

Wireless Bridge

Receives signal from wireless router and provides connection to wired devices


Wireless Antennas

Wireless Tower Dish Antenna


Wireless Antenna Types

Directional Antenna Omni-directional Antenna


Wireless Antenna Performance Factors

Infrared: Sunlight Obstacles Smoke, dust, fog

Radio: Antenna signal characteristics Wire mesh in walls, thick walls Ambient electrical noise Conductive obstacles Other electrical equipment Data transmission rate

Microwave: Weather Antenna signal characteristics Line of sight Distance between transmitting stations


WLAN Overview

Wireless connectivity device

Client systems


WLAN Architecture

STA AP Service sets BSS and BSSID ESS and ESSID IBSS DS


802.11 Modes

ESS

Distributed System

Infrastructure mode


802.11 Modes (Cont.)

Ad-hoc mode


SSID Broadcasts

Continuous announcement by WAP. Transmits its name (SSID). Often referred to as a beacon. If a WAP is password-protected, devices can see it but not connect to it.


Mobile Devices

Mobile phone Laptop Tablet Gaming device Media device


Guidelines for Implementing a Basic Wireless Network

Create a list of requirements. Consider devices and how they meet your requirements. Consider environmental limitations. Consider equipment limitations. Consider compatibility requirements. Choose appropriate 802.11 technology. Choose appropriate AP placement locations. Install APs. Test after installation:

Appropriately sized Secure Operational

Document steps and establish a baseline.


Reflective Questions

1. In your opinion, what are the primary considerations for implementing a wireless network?

2. What problems have you encountered when setting up a wireless network?

OV 3 - 1 Copyright © 2015 Logical Operations, Inc. All rights reserved. Unbounded Network Media ...

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