100 ' ********************************

110 ' *  IBM PC BASIC VERSION A3.30  *

120 ' *  FILE NAME "CCIR"            *

130 ' *  CCIR STANDARDS              *

140 ' *  1987/10             I.KATO  *

150 ' ********************************

160 KEY OFF:CLS:SCREEN 9

170 COLOR 14

180 LOCATE 1,1:PRINT "[ITEM 17]    TRANSMISSION QUALITY STANDARD ON HYPOTHETICAL REFERENCE CIRCUIT":PRINT :COLOR 7

190 PRINT "[HYPOTHETICAL REFERENCE CIRCUIT]"

200 PRINT "A hypothetical reference circuit for radio-relay systems is desired to the      designers of equipment and systems.  The CCIR Rec.392  stipulates that a"

210 PRINT "hypothetical reference circuit for telephony using frequency-division multiplex with a capacity of more than 60 channels should include the following equipmentsfor each 2500 km long transmission direction, as shown below.":PRINT

220 PRINT TAB(3)"3 sets of channel (audio) modulators":                             PRINT TAB(3)"6 sets of group  (g)      modulators":                             PRINT TAB(3)"6 sets of supergroup (sg) modulators"

230 GOSUB 1000

240 LOCATE 20,1:PRINT "Regarding a capacity of 12 to 60 telephone channels the students are requested  to adopt another hypothetical reference circuit defined by CCIR Rec.391."

250 COLOR 6:LOCATE 23,20:PRINT "----- To procced:  Hit space key -----"

260 COLOR 7:Q$=INKEY$:IF Q$<>" " THEN 260

270 CLS:SCREEN 0

280 LOCATE 1,1:PRINT "[ALLOWABLE NOISE POWER]"

290 PRINT "The total noise power in any telephone channel is, on one hand, depended upon a number of factors related to equipment design, and on the other hand, upon path";

300 PRINT "attenuation and its variation with time.   These are in turn dependent upon the distance between stations and the nature of the intervening terrain. This noise";

310 PRINT "power includes thermal noise and intermodulation noise caused by distortion of  transmission characteristics and interference with other radio waves.":PRINT

320 PRINT "On a 2,500km hypothetical reference circuit, the CCITT allows a mean value of   ";:COLOR 3:PRINT "10,000pW, ";:COLOR 7:PRINT "at the zero relative level point, for the overall noise power in any"

330 PRINT "hour.   The psophometric power corresponding to noise produced by all frequency division multiplex terminal equipments should not exceed one quarter of the"

340 PRINT "limit fixed above, i.e. ";:COLOR 3:PRINT "2,500pW ";:COLOR 7:PRINT "at the relative level point.   This leaves at"

350 COLOR 3:PRINT "least 7,500pW ";:COLOR 7:PRINT "available for the radio relay system."

360 PRINT "The CCIR recommends that noise power, at the point of zero relative level in anytelephone channel on a 2,500km hypothetical reference circuit for frequency     multiplex line-of-sight radio relay systems, should not exceed:":COLOR 3

370 PRINT "(1) 7,500 pW0p psophometrically weighted one minute mean power for more than        20 % of any month;"

380 PRINT "(2) 47,500 pW0p psophometrically weighted one minute mean power for more than       0.1 % of any month;"

390 PRINT "(3) 1,000,000 pW0 unweighted(with an integrating time of 5 ms) for more than        0.01 % of any month."

400 COLOR 6:LOCATE 23,40:PRINT "----- menu:  Hit space key -----"

410 COLOR 7:Q$=INKEY$:IF Q$<>" " THEN 410

420 CLS:SCREEN 0:RUN "ME"

1000 ' -------------------

1010 ' * graph draw sub  *

1020 ' -------------------

1030 WINDOW SCREEN(0,-50)-(112,66)

1040 VIEW(1,178)-(638,255),,0

1050 FOR I=0 TO 2

1060 L=37*I

1070 LINE(0+L,0)-(1+L,0),7

1080 CIRCLE(1.5+L,0),.5,4

1090 LINE(1.5+L,15)-(1.5+L,30),7,,&H8888

1100 LINE(2+L,0)-(3+L,0),7

1110 LINE(3+L,-5)-(4+L,5),6,BF

1120 LINE(4+L,0)-(5+L,0),7

1130 LINE(5+L,-15)-(6+L,15),2,BF

1140 LINE(6+L,0)-(7+L,0),3

1150 LINE( 7+L,0)-(8+L,-5),3 :' micro

1160 LINE( 7+L,0)-(8+L, 5),3

1170 LINE(10+L,0)-(9+L,-5),3

1180 LINE(10+L,0)-(9+L, 5),3 :' micro

1190 LINE(10+L,0)-(11+L,0),3

1200 LINE(11+L,-15)-(12+L, 15),2,BF

1210 LINE(12+L,0)-(14+L,0),7

1220 LINE(13+L,15)-(13+L,30),7,,&H8888

1230 LINE(14+L,-15)-(15+L, 15),2,BF

1240 LINE(15+L,0)-(16+L,0),3

1250 LINE(16+L,0)-(17+L,-5),3 :' micro

1260 LINE(16+L,0)-(17+L, 5),3

1270 LINE(19+L,0)-(18+L,-5),3 :' micro

1280 LINE(19+L,0)-(18+L, 5),3 :' micro

1290 LINE(19+L,0)-(20+L,0),3

1300 LINE(20+L,-15)-(21+L, 15),2,BF

1310 LINE(21+L,0)-(22+L,0),7

1320 LINE(22+L,-5)-(23+L, 5),6,BF

1330 LINE(23+L,0)-(24+L,0),7

1340 LINE(23.5+L,15)-(23.5+L,30),7,,&H8888

1350 LINE(24+L,-5)-(25+L, 5),6,BF

1360 LINE(25+L,0)-(26+L,0),7

1370 LINE(26+L,-15)-(27+L, 15),2,BF

1380 LINE(27+L,0)-(28+L,0),3

1390 LINE(28+L,0)-(29+L,-5),3 :' micro

1400 LINE(28+L,0)-(29+L, 5),3

1410 LINE(31+L,0)-(30+L,-5),3

1420 LINE(31+L,0)-(30+L, 5),3 :' micro

1430 LINE(31+L,0)-(32+L, 0),3

1440 LINE(32+L,-15)-(33+L, 15),2,BF

1450 LINE(33+L,0)-(34+L,0),7

1460 LINE(34+L,-5)-(35+L, 5),6,BF

1470 LINE(35+L,0)-(36+L,0),7

1480 CIRCLE(36.5+L,0),.5,4

1490 LINE(36.5+L,15)-(36.5+L,30),7,,&H8888

1500 NEXT

1510 LINE(111,0)-(112,0),7

1520 LINE(1.5,-5)-(1.5,-35),7,,&H8888

1530 LINE(110.5,-5)-(110.5,-35),7,,&H8888

1540 LINE(1.5,-35)-(110.5,-35),7,,&H8888

1550 LINE( 6,54)-( 7,54),3

1560 LINE( 7,54)-( 8,48),3

1570 LINE( 7,54)-( 8,59),3

1580 LINE(10,54)-(11,54),3

1590 LINE(10,54)-( 9,48),3

1600 LINE(10,54)-( 9,59),3

1610 LOCATE 14,39:PRINT "2500km"

1620 LOCATE 17, 1:PRINT "audio    sg      g       audio     sg      g       audio     sg      g     audio"

1630 LOCATE 18, 1:PRINT "          Radio modulator or demodulator (with baseband input or output)"

1640 RETURN