ENVS 1500 Study Guide - Summer 2018, Comprehensive Midterm Notes - Operating System, Computer Data Storage, Central Processing Unit
12 Oct 2018
School
Department
Course
Professor
ENVS 1500
MIDTERM EXAM
STUDY GUIDE
Fall 2018
ENVS 1500 Lecture 1 Notes – Wireless networking
Introduction
• Microwave communication applications include large-scale Internet backbone channels,
direct satellite-to-hoe teleisio, cellular telephoy, ad 8. Wi-Fi ireless
networking.
• It is usually necessary to convert between electrical and electromagnetic media formats.
• However, this technology is well developed and relatively inexpensive.
• One difficulty with the use of radio waves is interference between different
communications using the same carrier frequencies.
• Although the frequency spectrum seems large, it is heavily used for many different
purposes in most areas of the spectrum where communication is practical.
• Consider the interference between a microwave oven and a cordless phone, for
example.
• Higher frequencies are somewhat more available because of the ability to focus the
wave in a particular direction.
• The highest usable frequencies are, of course, light waves.
• There are wireless networks and direct computer-to-computer channels that use
infrared light as a medium.
• Wireless networking uses radio wave technology as a transmission medium.
• Like wired networking, wireless networking tends to fall into categories based on range.
• For typical short-range, local area networking, wireless Ethernet, more commonly called
Wi-Fi is the standard.
• For longer ranges there are two contenders, WiMax and cellular telephone technology,
although as of this writing neither technology has achieved the standardization, degree
of deployment, or use to determine its long-term success.
• At the personal level, Bluetooth is the generally accepted standard.
find more resources at oneclass.com
find more resources at oneclass.com
• As we mentioned there is also a recent development of technology and standards to
interconnect wireless Ethernet into a wireless mesh network using wireless technology
that can link many Wi-Fi areas into a larger network.
• Usually necessary to convert between electrical and electromagnetic media formats.
• However, this technology is well developed and relatively inexpensive.
• One difficulty with the use of radio waves is interference between different
communications using the same carrier frequencies.
• Although the frequency spectrum seems large, it is heavily used for many different
purposes in most areas of the spectrum where communication is practical.
• Consider the interference between a microwave oven and a cordless phone, for
example.
• Higher frequencies are somewhat more available because of the ability to focus the
wave in a particular direction.
• The highest usable frequencies are, of course, light waves.
• There are wireless networks and direct computer-to-computer channels that use
infrared light as a medium.
• Wireless networking uses radio wave technology as a transmission medium.
• Like wired networking, wireless networking tends to fall into categories based on range.
• For typical short-range, local area networking, wireless Ethernet, more commonly called
Wi-Fi is the standard.
• For longer ranges there are two contenders, WiMax and cellular telephone technology,
although as of this writing neither technology has achieved the standardization, degree
of deployment, or use to determine its long-term success.
find more resources at oneclass.com
find more resources at oneclass.com
Document Summary
Envs 1500 lecture 1 notes wireless networking. Introduction: microwave communication applications include large-scale internet backbone channels, direct satellite-to-ho(cid:373)e tele(cid:448)isio(cid:374), cellular telepho(cid:374)y, a(cid:374)d 8(cid:1004)(cid:1006). (cid:1005)(cid:1005) (cid:894)(cid:858)(cid:858)wi-fi(cid:859)(cid:859)(cid:895) (cid:449)ireless networking. Wi-fi is the standard: for longer ranges there are two contenders, wimax and cellular telephone technology, although as of this writing neither technology has achieved the standardization, degree of deployment, or use to determine its long-term success. Envs 1500 tutorial 1 notes delivery services. Novell ipx/spx and ibm systems network architecture: communications services within the operating system also provide the interface between the communication software and the os i/o control system that provides access to the network. Envs 1500 tutorial 2 notes security and protection services. Introduction: larger computers used for server applications often require the capability for additional growth and reliability to serve the needs of their clients, these capabilities are sometimes referred to as system scalability and fail-safe operation respectively.
