1、 KS C IEC 60050-721 KSKSKSKSSKSKSKS KSKSKS SKSKS KSKS SKS KS 721：, , KS C IEC 60050-721 : 2002 (2012 ) 2002 11 30 http:/www.kats.go.kr C IEC 60050 721： 2002 : ( ) ( ) ( ) : (http:/www.standard.go.kr) ： ： 2002 11 30 ： 2012 12 18 2012-0721 ： ： ( 02-509-7294) (http:/www.kats.go.kr). 10 5 , . ICS 01.040
2、.33； 29.020； 33.040 KS C IEC 721：, , 60050 721： 2002(2012 ) International electrotechnical vocabulary Chapter 721： Telegraphy, facsimile and data communication 1991 1 IEC 60050 721, International electrotechnical vocabularyChapter 721： Telegraphy, facsimile and data communication . 1. , , . 2. , , 1
3、9 . 721 01： (forms of telecommunication using discrete signals) 721 02： , , (discretely-timed and digital signals, signal elements) 721 03： (transmission using discretely-timed or digital signals) 721 04： (transmission channels and methods) 721 05： (direct current transmission) 721 06： , (carrier tr
4、ansmission, multiplexing) 721 07： , (transmission performance, distortion in time) 721 08： (errors and error control) 721 09： , (codes and alphabets) 721 10： , (function controls and function signals) 721 11： , (transmission channels and processes) 721 12： (telegraph and data transmission equipments
5、) 721 13： (facsimile equipments and services) 721 14： (facsimile operational characteristics) 721 15： (defects and distortion in facsimile reproduction) 721 16： (telegraph and data networks) 721 17： , (telegraph and data switching, signalling) 721 18： (telegraph operation and services) 721 19： (data
6、 transmission operation and services) 3. , , . 2 . C IEC 60050 721： 2002 2 72101 ： (forms of telecommunication using discrete signals) ( ) 7210101 (7010114) teleprocessing 7210102 (7010111) data 7210103 (7010112) . data communication 7210104 (7010113) . data transmission 7210105 (7010116) , , , tele
7、matics (services) 7210106 (7010107) . . telegraphy 7210107 , alphabetic telegraphy character telegraphy 7210108 (7010110) . , , . telewriting teleautography 7210109 (7010109) , , , , facsimile telecopy 7210110 , , , 2 (level) , , 2 document facsimile black and white facsimile 7210111 picture facsimi
8、le 7210112 (階調 ) . , , . phototelecopy phototelegraphy 7210113 ： , , , , , telegraph service 7210114 telegram service public telegram service 7210115 (7010108) telex (service) 7210116 50 supertelex (service) high speed telex C IEC 60050 721： 2002 3 ( ) 7210117 (7010120) . teletex (service) 72102 ： ,
9、 , (discretely-timed and digital signals, sig nal elements) ( ) 7210201 (7020404) . ( , , , ) . , 140 Mbps . discretely-timed signal discrete signal 7210202 (7020405) 2 . , . digital signal 7210203 (7020402) , ( , .). ( .). analogue signal 7210204 (7042302) sampling (of a signal) 7210205 (7020407) .
10、 , . , . . quantization (of a quantity)7210206 (7020501) . , (正負 ), , , . signal element 7210207 (7020502) digit 7210208 (7020503) 2 binary digit bit (abbreviation) 7210209 (7020504) 2 2 . 0 1 . binary figure 7210210 (7020505) n n n-ary digit 7210211 (7020506) n 2 n-bit byte(1) 7210212 (7020507) 2 2
11、 2 doublet(byte) 2-bit byte (USA) 7210213 3 3 2 triplet (byte) 3-bit byte (USA) C IEC 60050 721： 2002 4 ( ) 7210214 4 4 2 quartet (byte) 4-bit byte (USA) 7210215 5 5 2 quintet (byte) 5-bit byte (USA) 7210216 6 6 sextet (byte) 6-bit byte (USA) 7210217 7 7 septet (byte) 7-bit byte (USA) 7210218 (70205
12、09) 8 8 byte octet 8-bit byte 7210219 n n 2 n-bit byte (2) 7210220 (7010307) , , code 7210221 (7010516) . code conversion 7210222 (7020521) significant condition 7210223 (7020522) number of significant conditions 7210224 two conditions 7210225 three conditions 7210226 four conditions 7210227 change-
13、over 7210228 2 transition 7210229 significant instant 7210230 2 significant interval 7210231 theoretical duration of a significant interval 7210232 . . unit interval signal element (USA) 7210233 unit element C IEC 60050 721： 2002 5 72103 ： (transmission using discretely -timed or digital signals) (
14、) 7210301 (7020413) / . . isochronous 7210302 (7020415) 2 2 anisochronous 7210303 . start-stop signal 7210304 (7020417) . . synchronous 7210305 , synchronous transmission 7210306 2 2 . , . anisochronous transmission7210307 start-stop transmission 7210308 . , . digital transmission (of a discretely-t
15、imed signal) 7210309 (7020510) character 7210310 character signal 7210311 block 7210312 start-of-block signal 7210313 end-of-block signal 7210314 block signal 7210315 (公稱 ) start signal 7210316 start element 7210317 stop signal 7210318 stop element 7210319 A A condition 7210320 Z Z condition C IEC 6
16、0050 721： 2002 6 ( ) 7210321 . , (正負 ) ( ) 2 , 1 5 . equal length code 7210322 n n n-unit code 7210323 n n code combination code representation code value 7210324 A A A element 7210325 Z Z Z element 7210326 modulation rate 7210327 T( ) B . 1 1 . 1 5 ms 200(B) . B 1/T . baud(symb： Bd) 7210328 speed c
17、onversion 7210329 2 actual transfer rate transfer rate 7210330 2 2 1. . =mi1ii2ilog1nTm , Ti i . ni i . 2. 2 bit/s . binary rate signalling rate 7210331 2 effective transfer rate 72104 ： (transmission channels and methods) ( ) 7210401 (7010202) , . telephone-type channel 7210402 (7010204) telephone-
18、type circuit 7210403 wideband channel 7210404 . multiplex C IEC 60050 721： 2002 7 ( ) 7210405 (7010309) ( ) multiplexing 7210406 (7010310) (群 ) , demultiplexing 7210407 multiplexer 7210408 demultiplexer 7210409 (multiplexer) (demultiplexer) , muldex muldem 7210410 multiplex signal multiplexed signal
19、 7210411 ( ) ( ) time division multiplexing TDM(abbreviation) 7210412 , frequency division multiplexing FDM(abbreviation) 7210413 homogeneous multiplex 7210414 heterogeneous multiplex 7210415 (7010316) . , . simplex half duplex (deprecated) 7210416 (7010317) duplex full duplex (deprecated) 7210417 ,
20、 differential duplex 7210418 , . bridge duplex 7210419 . incremental duplex 7210420 . opposition duplex 7210421 (7010318) . unidirectional. C IEC 60050 721： 2002 8 ( ) 7210422 (7010319) . 1. . 2. . bidirectional 7210423 (7010320) . one way. 7210424 (7010321) . both way. two way. 7210425 (7010205) .
21、2 , . 1. . 2. . (frequency) channel 72105 ： (direct current transmission) ( ) 7210501 direct current transmission 7210502 single current transmission 7210503 double current transmission7210504 0 , on-off transmission 7210505 sub-telephone transmission7210506 , phantom circuit 7210507 , earth-return phantom circuit 7210508 earth-return double phantom circuit 72
