Data Communication ELEX 4340

INTRODUCTION

• Define and describe seven element data circuit and seven layer OSI model.
• History
• Definitions
• Data communications
• Protocol
• Serial/parallel
• Synchronous/asynchronous
• Protocol functions and the OSI model
• Physical layer
• Data-link layer and sublayers
• Network layer
• Transport layer
• Session layer
• Presentation layer
• Application layer

RS-232 STANDARD

• Analyze, design and test data communication signals and circuits.
• Electrical Characteristics
• Voltage levels
• Impedance
• Slew rate
• Signals and cabling
• Signals:
• grounds
• data (TD, RD)
• control (RTS, CTS, DTR, DST, CD, RI)
• timing (TX and RX clocks)
• test
• secondary channel signals
• cable configurations
• straight through (DTE-DCE)
• null modem (DTE-DTE or DCE-DCE)
• PC loopback
• synchronous DCE and/or DTE
• Transmission line characteristics
• Primary line constants and characteristic impedance
• Propagation velocity
• Attenuation and phase delay
• Bias distortion
• Effects on communications distance and data rate

BAUD, BAUD RATE, KBPS, AND FREQUENCY OF DATA

• Use test equipment to measure data communication signals and waveforms.
• **** DATA COMPRESSION INTERSYMBOL INTERFERENCE, NYQUEST, SHANNON, SIGNAL TO NOISE, ENVELOPE DELAY, TRANSMISSION LINES, PHASE DELAY, PROPAGATION CO-EFFICIENT.

UNIVERSAL ASYNCHRONOUS RECEIVER/TRANSMITTER

• Program and test data terminal equipment.
• UART functions in general
• 16550- the basic PC UART
• Data and status registers
• Initialization
• bit rate
• character format
• Character transmission and reception - polled mode
• 16550 Interrupt control and identification registers
• PC hardware interrupts - the 8259 PIC
• - PC interrupt mechanism
• - Programming the 8259
• Communications programming
• Data structures: the circular buffer
• Potential problems
• Flow control: hardware; software.
• - hardware
• - software

ALTERNATIVES TO THE RS-232 INTERFACE

• Analyze two-wire data circuits.
• Current loop (digital)
• Current loop (analog)
• Balanced line interface
• RS-422
• RS-485
• Universal Serial Bus, IEEE 1394, Firewire

CHANNELS AND CIRCUITS

• Calculate and predict data circuit parameters and behaviour.
• Channel types
• Simplex
• Half-duplex
• Full duplex
• Echoplex
• Channel capacity
• Shannon's Limit
• Shannon-Hartley theorem
• Circuit types
• Switched (analog and digital)
• Leased (analog and digital)
• Multiplexed (TDM and FDM)
• ATM
• Bit error rate (BER)
• Data Compression (relative encoding, run-length encoding, algorithmic encoding).

ERROR CONTROL

• Describe and perform standard error control procedures.
• Vertical redundancy check (VRC)
• Longitudinal redundancy check (LRC)
• Cyclic redundancy check (CRC)
• Automatic request for repeat (ARQ)
• Forward error control (FEC)

MODEMS

• Configure and test data communication equipment.
• Baseband vs broadband transmission
• Modulation
• FSK: wide-shift, narrow-shift, MSK
• FSK: standards (Bell 103, 202, etc.)
• PSK: binary, differential, coherent
• PSK: standards (Bell 212)
• Multilevel:
• QPSK and QAM
• digital modulation - ROM/DAC and DSP/DAC
• Trellis coded
• Encoding
• Manchester
• NRZ & RZ codes, AMI
• B8ZS
• Synchronous Codes
• Using and programming a modem
• RS-232 signals
• Hayes command set
• Error correction
• Line conditioning
• Training

PROTOCOLS

• Analyze and describe data packet protocols.
• XMODEM
• Data links
• Synchronous communications
• Character-oriented protocols - BSC
• BSC frame format
• Transparency
• Bit-oriented protocols - HDLC
• Transparency and the flag
• Bit stuffing
• HDLC frame format
• Packet sequence example
• Channel access
• Polled
• CSMA and Aloha
• Token bus

LOCAL AREA NETWORKS

• Analyze and describe LAN topologies and operating system procedures.
• Introduction
• Configuration: star; bus; ring
• Protocol layers
• Token ring
• Ethernet
• Physical layer
• Data-link layer
• CSMA/CD operation
• Netware
• Protocol layers revisited
• IPX frame format
• Netware operation

WIDE AREA NETWORKS

• Describe the organization of interconnected data communication systems.
• Introduction and definition
• X.25 packet switched network, SMDS, frame relay
• TCP/IP protocol
• Bridges, routers, and gateways

SELECTED TOPICS IN DATA COMMUNICATIONS

• These may include any of the following topic or topics suggested during the term:
• Describe contemporary and emerging data communication systems.
• ATM
• FDDI
• SONET
• DIGITAL CELLULAR

Effective as of Winter 2005