e service provided on an incoming or outgoing basis. Wideband. A system with a multi-channel bandwidth of 20 kHz or more. Theauthor hefollowing sources for listingsusedinthisglossary: American National Standard Vocabulary for Information Proc- essing, American National Standards Institute, Inc., June 1980. Federal Telecom Standard 1037 Vocabulary for Telecommunica- tions, May 1978. INDEX Access methods, 87 converters, 44 acknowledgments, 39, 40, 43 CRC error detection, 40, 47 acoustic coupler, 19 CRT terminals, 51 advalanche photodiode, 12 CSMA/CD, 87 aggregate, 25 cursor, 53 alarming, 73 analog to digital conversion, 6 Data monitor, 79 analog transmission, 6 data service unit, 113 ASCII code, 4, 44, 45 DCE, 33, 34 asynchronous, 8 DDD, service, 114 auto answer device, 22 deterministic network, 86 diagnostics, central, 71 Backend network, 85 dial backup, 22 Bandsplitter, 31 digital transmission, 6 bandwidth, 6, 24 distortion, 112, 113 baseband, 6 distributed network, 4 baud, 6, 9, 19 DTE, 33, 34 baudot, 44, 45 BCD, 43 Earth station, 107 bisync, 38, 39 EBCDIC, 44 bit stuffing, 41 encryption, 80 breakout box, 77 error rate testers, 78 buffers, 54 errors, 45 bus topology, 84 control of, 39 detection of, 40, 47 Cable choices, 89 effects of, 48 CCITT, 20 Ethernet, 87 channels, 4, 5, 21 circuit switching, 93, 94 Facsimile, 63, 64 coax, 91 facsimile services, 115 codes, 43 fallback, 69 Comsat, 110 fiber optic cable, 11, 90, 114 concentrator, 25 fiber optics, 9 conditioning, 111, 112 frame, 42 130 INDEX frequency division, 24 monitoring, 69 frequency shift keying, 17, 24 multidrop, 15, 55 front end network, 84 multiplexers, 16, 22, 24 front end processor, 49 bit oriented, 27 full duplex, 5, 56 character oriented, 27 FDM, 24 Graded index fiber, 11 STAT, 25, 29 graphic terminals, 62, 63 TDM, 28, 29 type comparisons, 26 Half duplex, 5 multivendor network, 76 handshaking, 35 HDLC, 33, 41 NAK, 43 horizontal distribution, 92 network, 3 backend, 85 Idle character, 28 control center, 73 image resolution, 66 design, 103 frontend, 