LAN and IEEE Standards
October 31, 2016
Categorised in: Data Communicaiton & Wireless Sensor Networks
ETHERNET
It defines a number of wiring for the physical layer, through means of Network access at the Media Access Control (MAC)/Data Link Layer, and a Common addressing format.
The combination of the twisted pair versions of Ethernet with the fiber optic versions largely replacing standards such as coaxial cable Ethernet.
In recent years, Wi-Fi, the wireless LAN standardized by IEEE 802.11, has been used instead of Ethernet for many home and small office networks and in addition to Ethernet in larger installations.
The Institute of Electrical and Electronics Engineers Standards Association (IEEE- SA) is an organization within IEEE that develops global standards in a broad range of industries, including: power and energy, biomedical and health
care, information technology and robotics, telecommunication and
home automation, transportation, nanotechnology, information assurance, and
many more.
IEEE Standards
802.11 Wireless LAN
Prolevgidaecsynetwork connectivity over wireless media wired
An Access Point (AP) is installed to act as Bridge between Wireless and Wired Network
The AP is connected to wired network and is equipped with antennae to provide wireless connectivity
Range ( Distance between Access Point and WLAN client) depends on structural interferences and RF gain of the antenna at the Access Point
To service larger areas, multiple APs may be installed with a 20-30% overlap
A client is always associated with one AP and when the client moves closer to another AP, it associates with the new AP (Hand-Off)
Three flavors:
802.11b
802.11a
802.11g
Multiple Access with Collision Avoidance (MACA)
Before every data transmission
- Sender sends a Request to Send (RTS) frame containing the length of the transmission
- Receiver respond with a Clear to Send (CTS) frame
- Sender sends data
- Receiver sends an ACK; now another sender can send data
When sender doesn’t get a CTS back, it assumes collision
WiMAX : Broadband Wireless Access
WiMAX (Worldwide Interoperability for Microwave Access) is a wireless communications standard designed to provide 30 to 40 megabit-per-second data rates, with the 2011 update providing up to 1 Gbit/s
ZigBee
Technological Standard Created for Control and Sensor Networks
Based on the IEEE 802.15.4 Standard
Created by the ZigBee Alliance
ZigBee Aims Low
Low data rate
Low power consumption
Small packet devices
What Does ZigBee Do?
Designed for wireless controls and sensors
Operates in Personal Area Networks (PAN’s) and device-to-device networks
Connectivity between small packet devices
Control of lights, switches, thermostats, appliances, etc.
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