1. Introduction to Data Communications and Networking.
2. Signals, Noise, Modulation, and Demodulation.
3. Cable Transmission Media.
4. Optical Fiber Transmission Media.
5. Digital Transmission.
6. Multiplexing and T-Carriers.
7. Wireless Communications Systems.
8. Telephone Instruments and Signals.
9. The Telephone Circuit.
10. The Public Telephone Network.
11. Cellular Telephone Concepts.
12. Cellular Telephone Systems.
13. Data Communications Codes, Data Formats, and Error Control.
14. Data Communications Hardware, Serial and Parallel Interfaces.
15. Data Communications Equipment.
16. Data Link Protocols.
17. Networking and Internetworking.
18. Local Area Networks.
19. TCP/IP Protocol Suite and Internet Protocol Addressing.
20. Networks and Subnetworks.
21. Network-Layer Protocols.
22. Internet Control Management Protocol.
23. Transport-Layer Protocols.
24. Internet Protocol Version 6.
25. Configuration and Domain Name Protocols.
26. TCP/IP Applications-Layer Protocols.
27. Integrated Services Data Networks.
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Revision 2.1 - Introduction to Data Communications
In the 1950s, computer systems used batch processing, and users carried their punched cards to the computer for processing. By the 1960s, data communication across telephone lines became more common. Users could type their own batches of data for processing using online terminals. Data communications involved the transmission of messages from these terminals to a large central mainframe computer and back to the user.
Chapter 1. Introduction to Data Communications | …
There are several ways this can be accomplished, such as through a shared memory bus or over a network, however the actual event of data exchange is commonly referred to as communications regardless of the method employed.
Chapter+1+Introduction+to+Data+Communications - …
The first commercial microwave link for telephone transmission was established in Canada in 1948. In 1951, the first direct long-distance dialing without an operator began. The first international satellite telephone call was sent over the Telstar I satellite in 1962. By 1965, there was widespread use of commercial international telephone service via satellite. Fax services were introduced in 1962. Touch-tone telephones were first marketed in 1963. Picturefone service, which allows users to see as well as talk with one another, began operating in 1969. The first commercial packet-switched network for computer data was introduced in 1976.
01 Introduction DATA COMMUNICATIONS AND NETWORKING …
With an MDF, all cables run into the MDF. If one switch becomes overloaded, it is straightforward to unplug the cables from several high-demand computers from the overloaded switch and plug them into one or more less-busy switches. This effectively spreads the traffic around the network more efficiently and means that network capacity is no longer tied to the physical location of the computers; computers in the same physical area can be connected into different network segments.
Introduction to Data Communications - SQA
With rack-mounted equipment, it becomes simple to move computers from one LAN to another. In the switched backbone design as shown in Figure 8.6, for example,all the computers in the same general physical location are connected to the same switch and thus share the capacity of the switch. Although this often works well, it can cause problems if many of the computers on the switch are high-traffic computers. For example, in Figure 8.6, if all the busy computers on the network are located in the upper left area of the figure, the switch in this area may become a bottleneck.
INTRODUCTION TO COMMUNICATION - WikiEducator
In 1837, Samuel Morse exhibited a working telegraph system; today we might consider it the first electronic data communication system. In 1841, a Scot named Alexander Bain used electromagnets to synchronize school clocks. Two years later, he patented a printing telegraph—the predecessor of today’s fax machines. In 1874, Alexander Graham Bell developed the concept for the telephone at his father’s home in Brantford, Ontario, Canada, but it would take him and his assistant, Tom Watson, another two years of work in Boston to develop the first telephone capable of transmitting understandable conversation in 1876. Later that year, Bell made the first long-distance call (about ten miles) from Paris, Ontario, to his father in Brantford.