Page 72 - DCAP311_DCAP607_WIRELESS_NETWORKS

Wireless Networks

Notes 2. ............................... uses short-range radio waves over distances up to approximately 10
metres
3. A Bluetooth PAN is also called a ...............................
4. The intent of ............................... technologies is to provide members of workgroups access
to corporate network resources be it shared data, shared applications or e-mail but do so in
way that does not inhibit a user’s mobility.
5. ............................... method uses a wide frequency band together with Code Division
Multiple Access (CDMA).
6. There are three types of infrared transmission: ..............................., directed and directed
point-to-point.

7. A group of stations belonging to an AP is called ...............................
4.2 Wireless PAN Technologies (WPAN)

The communication network established for the purpose of connecting computer devices of
personal use is known as the personal area network PAN (Personal Area Network).when a
network is established by connecting phone lines to personal digital devices or PDAs (personal
digital assistants), this communication is known as PAN (Personal Area Network). Thomas
Zimmerman was the first research scientist to introduce the idea of Personal Area Network
(PAN).
The basic purport of establishing PAN (Personal Area Network) is provide a communication
channel to the individuals, who want to carry their own digital devices .however at the same they
want to stay in contact with the network. PAN (Personal Area Network) networks often cover
an area of 30 feet. Personal computer devices may include palm tops mobile phones, potable
media players, play stations and net books. These devices help a person to browse internet while
traveling, to write notes and to send instant messages. These personal digital devices assist a
person to develop networks and communicate via intranet, internet or even extranet. There are
many wireless technologies which are helpful in developing wireless personal area network.
Personal area networks (PAN) are developed either using cables or wireless technologies.
Wireless PAN (Personal Area Network) is connected to the wired PAN (Personal Area Network)
system either using firewire or USB.
PANs (Personal Area Network)s are dependent on the Bluetooth or infrared technologies for the
transmission of wireless signals. Piconets are ad hoc networks. In this piconets network number of
devices are connected by using Bluetooth technology. One key master device is further attached
to seven or more than dynamic slave seven devices. Master device has a control and option to
activate these devices at any time. Piconets work over a range of 200metres and transmit data
of about 2100 kbit/ sec. the main focus point of wireless PAN (Personal Area Network) is to
facilitate individual workspace. The Bluetooth technology used in wireless PAN (Personal Area
Network) connection is based on IEEE 802.15 standard.
Wireless Personal Area Network (WPAN) can perform really efficient operations if we connect
them with specialized devices. For examples it can help surgeons to seek guidance from other
surgeons or team members during a surgical operation. Wireless Personal Area Network
(WPAN) is based on plug –in technology. When wireless equipments come into contact with
each other within the range of few kilometers, give an illusion if they are connected with a cable.
Rapid development and improvement in this technology is needed in this area. This further
development would help develop a seamless network between office and home devices. This
development would help scientists, archeologists and people associated to other departments to
transfer their findings to any database around them.
The wearable and portable computer devices communicate with each other. These devices while
communicating transfer digital signals and information, these signals are transferred using the

66 LOVELY PROFESSIONAL UNIVERSITY