DEC, Digital Equipment Corporation, 1977, fifth printing July 1979; 387 pages, index, glossary, tables and diagrams, appendices.
Condition: Good+ overall, blue cloth hardcover, titles in white on cover and spine; spine lean, ex-technical library rubberstamps on endpages. Binding is sound, pages clean.
Keywords: single line synchronous interface, bit oriented protocols, modems in the 1980s, packet switching networks, error detection, telephone switching systems, asynchronous multiplexers, asynchronous modems, synchronous communication, history of modems
Categories: 1970's computers and computing, 1980's computers and computing, Computer Science, Computers and Society, Databooks, Handbooks, Manuals, DEC (Digital Equipment Corporation), Hardware, Human-Computer Interaction, Microcomputers, Minicomputers, Word Processing, Data Processing
See all items by John E. McNamara
Item DescriptionIncludes Sections on -- Asynchronous Communications; A Single Line Asynchronous Interface (characteristics of the UART, block diagram of sinle line async interface, bit assignments for registers, etc)
The Twenty Milliampere Loop - hstory, general principles of teleprinters, methods of generating 20 milliampere currents, simple circuits for printer and keyboard loops, optical couplers, connecting 20 milliampere circuits to one another, more
Asynchronous Modems for Private Lines - relays as repeaters, two-wire versus four-wire, private line vs dial, the Bell System 103F principles of operation and modem options, the Bell System 202 principles of operations
Interface Standards - condensed version of RS-232-C, clock distortion and bias distortion, RS-422 and RS-423, more; A Single Line Asynchronous Interface with Control for Private Line Modems
Asynchnronous Multiplexers; Telephone switching systems - historical development of the need for telephone switching systems; magneto switchboards, terminology, common battery systems, Strowger, detection of service request, dialing, tone signaling, speed of connection, CCIS, traffic capacity, hunt groups, noise, switched network structure, VNL design, echo suppressors, network management
Modem Control for Switched Network Use; Asynchronous Modems for Switched Network Use - available frequency spectrum, detials of the Bell System 103, originate mode and answer mode, eye patterns, carrier loss clamps, more
Automatic calling Units -- applications, Bell System 801A and 801C, more; Asynchronous Multiplexers with Modem Control - programmable formats and speeds, common terminal operating speeds, direct memory transfers, current addresses and byte counts, monitoring and cotnrolng modems on 16 lines, transition detection systems, more
Error detection - VRC and LRC, cyclic redundancy checks CRC, mathematical presentation of CRC, step by step examples, more
Synchronous Communication -- synchronizing on one character or two, phase modulation operaton of the Bell System 201B modem, product modulators, operaton of 9600 bit per second modems, more
A Single Line Synchronous Interface - LSI chips, block diagrams, bit assignments, modem control leads, more
Protocols BISYNC and Character Oriented Protocols; DDCMP and Byte Count Oriented Protocols; SDLC and Bit Oriented Protocols; A Single Line Synchronous Interface for Bit Oriented Protocols High Performance Interfaces
Microprocessor Based Multiplexers; Interprocessor Communication;Digital Transmission and Packet Switching Networks - problems with analog telephone systems, analog amplifiers, digital transmission systems, T1 carrier systems, digital transmission service offerings, circuit switching, message switching, packet switching, benefits of; X.25, introduction to SNAP protocol
Parallel Communication; Special Problems; How far, how fast - speed versus distance tables for varoius types of interface circuits; Modem Options -- A list of Bell System modem options and the option selections preferred by DEC field service; Codes - tables of Baudot, ASCII and other communicaton codes
Universal Asynchronous Receiver Transmitter - explanation and block schematics of the UART integrated circuit, pin assignments and signal functions; Format and Speed Table for Asynchronous Communication; Channel Conditioning; Glossary; Index.