ELECTRONIC COMMUNICATIONS A SYSTEMS APPROACH CHAPTER Copyright © 2014 by Pearson Education, Inc. All Rights Reserved Electronic Communications: A Systems.

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ELECTRONIC COMMUNICATIONS A SYSTEMS APPROACH CHAPTER Copyright © 2014 by Pearson Education, Inc. All Rights Reserved Electronic Communications: A Systems Approach Beasley | Hymer | Miller Computer Communication and the Internet 11

Electronic Communications: A Systems Approach Beasley | Hymer | Miller Copyright © 2014 by Pearson Education, Inc. All Rights Reserved Alphanumeric Codes The ASCII Code  American Standard Code for Information Interchange (ASCII) 7-bit code used for representing alphanumeric symbols with a distinctive code word.  Developed for purpose of coding binary data.  ASCII-7 Adopted international standard.

Electronic Communications: A Systems Approach Beasley | Hymer | Miller Copyright © 2014 by Pearson Education, Inc. All Rights Reserved Figure 11-1 American Standard Code for Information Interchange (ASCII).

Electronic Communications: A Systems Approach Beasley | Hymer | Miller Copyright © 2014 by Pearson Education, Inc. All Rights Reserved Alphanumeric Codes The EBCDIC Code  Extended Binary-Coded Decimal Interchange Code (EBCDIC) 8-bit alphanumeric code.

Electronic Communications: A Systems Approach Beasley | Hymer | Miller Copyright © 2014 by Pearson Education, Inc. All Rights Reserved Figure 11-2 The Extended Binary-Coded Decimal Interchange Code.

Electronic Communications: A Systems Approach Beasley | Hymer | Miller Copyright © 2014 by Pearson Education, Inc. All Rights Reserved Table 11-1 The EBCDIC Code—List of Abbreviations

Electronic Communications: A Systems Approach Beasley | Hymer | Miller Copyright © 2014 by Pearson Education, Inc. All Rights Reserved Alphanumeric Codes The Baudot Code  Alphanumeric code based on five binary values.

Electronic Communications: A Systems Approach Beasley | Hymer | Miller Copyright © 2014 by Pearson Education, Inc. All Rights Reserved Figure 11-3 The Baudot code.

Electronic Communications: A Systems Approach Beasley | Hymer | Miller Copyright © 2014 by Pearson Education, Inc. All Rights Reserved Figure 11-4 Baudot code examples.

Electronic Communications: A Systems Approach Beasley | Hymer | Miller Copyright © 2014 by Pearson Education, Inc. All Rights Reserved Alphanumeric Codes The Gray Code  Numeric code representing decimal values 0 to 9.  Based on relationship that only one bit in a binary word changes for each binary step.

Electronic Communications: A Systems Approach Beasley | Hymer | Miller Copyright © 2014 by Pearson Education, Inc. All Rights Reserved Figure 11-5 The Gray code.

Electronic Communications: A Systems Approach Beasley | Hymer | Miller Copyright © 2014 by Pearson Education, Inc. All Rights Reserved Computer Communication Asynchronous system  Transmit and receive clocks free-run at approximately same speed. Synchronous system  Both sender and receiver exactly synchronized to same clock frequency.

Electronic Communications: A Systems Approach Beasley | Hymer | Miller Copyright © 2014 by Pearson Education, Inc. All Rights Reserved Computer Communication Universal Serial Bus (USB) Port  Universal high-speed serial communications interface. See Table 11-2: The USB Wire Colors and Functions

Electronic Communications: A Systems Approach Beasley | Hymer | Miller Copyright © 2014 by Pearson Education, Inc. All Rights Reserved Table 11-2 The USB Wire Colors and Functions

Electronic Communications: A Systems Approach Beasley | Hymer | Miller Copyright © 2014 by Pearson Education, Inc. All Rights Reserved Figure 11-6 The USB Type A and Type B connectors.

Electronic Communications: A Systems Approach Beasley | Hymer | Miller Copyright © 2014 by Pearson Education, Inc. All Rights Reserved Figure 11-7 An example of using the MAX3451 transceiver for establishing a USB connection.

Electronic Communications: A Systems Approach Beasley | Hymer | Miller Copyright © 2014 by Pearson Education, Inc. All Rights Reserved Computer Communication IEEE 1394  High-speed serial connection for computers and peripherals; developed by Apple (FireWire).

Electronic Communications: A Systems Approach Beasley | Hymer | Miller Copyright © 2014 by Pearson Education, Inc. All Rights Reserved Figure 11-8 The IEEE 1394 connector and pin assignments.

Electronic Communications: A Systems Approach Beasley | Hymer | Miller Copyright © 2014 by Pearson Education, Inc. All Rights Reserved Computer Communication RS-232 Standard  Older serial data communications follows standard (RS-232 C).  Means of interfacing computer with modem.  Defined signal levels and different lines used.

Electronic Communications: A Systems Approach Beasley | Hymer | Miller Copyright © 2014 by Pearson Education, Inc. All Rights Reserved Figure 11-9 DB-25 connector.

Electronic Communications: A Systems Approach Beasley | Hymer | Miller Copyright © 2014 by Pearson Education, Inc. All Rights Reserved Figure Signal description for DB-25.

Electronic Communications: A Systems Approach Beasley | Hymer | Miller Copyright © 2014 by Pearson Education, Inc. All Rights Reserved Computer Communication RS-232 Line Descriptions  Ground pins  Data signal pins  Handshaking pins  Equipment ready pins

Electronic Communications: A Systems Approach Beasley | Hymer | Miller Copyright © 2014 by Pearson Education, Inc. All Rights Reserved Figure DB-9 connector.

Electronic Communications: A Systems Approach Beasley | Hymer | Miller Copyright © 2014 by Pearson Education, Inc. All Rights Reserved Computer Communication RS-232 Line Descriptions  Signal detect pin  Ring indicator pin  Other pins See Table 11-3: Overview of Current Serial Computer Communication Standards

Electronic Communications: A Systems Approach Beasley | Hymer | Miller Copyright © 2014 by Pearson Education, Inc. All Rights Reserved Table 11-3 Overview of Current Serial Computer Communication Standards

Electronic Communications: A Systems Approach Beasley | Hymer | Miller Copyright © 2014 by Pearson Education, Inc. All Rights Reserved Figure The RS-232 null modem connection.

Electronic Communications: A Systems Approach Beasley | Hymer | Miller Copyright © 2014 by Pearson Education, Inc. All Rights Reserved Computer Communication RS-422, RS-485  Uses differential technique that provides significant improvement in performance and greater distances and capacity to support higher data rates.  Supports multidrop applications. See Table 11-4: Standard Computer Bus Interfaces

Electronic Communications: A Systems Approach Beasley | Hymer | Miller Copyright © 2014 by Pearson Education, Inc. All Rights Reserved Table 11-4 Standard Computer Bus Interfaces

Electronic Communications: A Systems Approach Beasley | Hymer | Miller Copyright © 2014 by Pearson Education, Inc. All Rights Reserved Table 11-4 (continued) Standard Computer Bus Interfaces