ITU-R S (2010/01)

ITU-R S.7- (200/0) "#! S

ITU-R S.7- ii.. (IPR) (ITU-T/ITU-R/ISO/IEC).ITU-R http://www.itu.int/itu-r/go/patents/en. (http://www.itu.int/publ/r-rec/en ) ( ) () BO BR BS BT F M P RA S RS SA SF SM SNG TF V :.ITU-R 200 ITU 200..(ITU)

ITU-R S.7- (200-2005) ITU-R S.7- (ITU-R 263-/4 ). ().. " ". ( ( ITU-R S.420 ITU-R S.062 ITU-T G.826 () ( ( (.3 ) ( (ITU-R S.248 2 2

ITU-R S.7-2 3 (2 2 ) 7-0 : ) ( ).4 (2 5 3 2 ). (2 4 4 2.4. - 4 ).(2. ITU-R S.248-2. 2.((HTTP) 6 5-3 ) (FTP)

ITU-R S.7-3 -... 7... 7 2... 7.2 - -... 7 2.2 VSAT... 7.2.2... 7 2.2.2... 8 3.2... 8 2 -... 9... 9 2... 9.2... 9..2... 9 2..2... 9 3..2... 9 2.2... 0.2.2... 0 2.2.2... 2 3.2.2... 8 3.2... 8.3.2... 8 2.3.2... 9 3.3.2... 9 4.3.2... 24 3... 24.3... 24 2.3... 25.2.3... 25 2.2.3... 26 3.2.3... 27 3.3... 29

4 ITU-R S.7-4...ATM 29.4... 29 2.4 ATM... 3 3.4... 32.3.3... 33 2.3.3... 35 4.4... 37 5... 37.5... 37..5... 37 2..5... 38 2.5... 40.2.5... 40 2.2.5... 40 3.2.5... 42 3.5... 42 6 ) (FTP)...((HTTP) 42.6 ATM... 43 2.6 FTP OC-3... 44 3.6 HTTP OC-3... 46.3.6 HTTP.0... 46 2.3.6 HTTP.0 "..." 46 3.3.6 HTTP. /... 46 4.3.6 HTTP.... 47 5.3.6... 47 4.6... 50 7... 50

5 ITU-R S.7- (ATM adaptation layer) (ATM) (Acknowledgement) (Asynchronous transfer mode) (Bandwidth delay product) (Bit-error ratio) (Bandwidth) (Congestion experience bit) (Central processing unit) ( Congestion window (variable in )) ( ) (Dedicated access) (Delayed acknowledgement) (Demand assignment multiple access) (Digital video broadcast via satellite) (Explicit congestion notification) (Equivalent isotropically radiated power) (Forward error correction) (Final segment (in a connection) ( ) (File transfer protocol) (Gain to equivalent system temperature ratio) (Geostationary satellite orbit) (Gateway) (Hub page accelerator) (Hub satellite processor) (Hypertext markup language) (Hypertext transfer protocol) (Internet control message protocol) (Internet engineering task force) (Input/output) / (Internet protocol) (IP security protocol) (Internet service provider) (Local area network) (Long fat network) (Multifrequency time division multiple access) (Moving picture experts group) (Multiprotocol label switching) AAL ACK ATM BDP BER BW CE CPU cwnd DA DACK DAMA DVB-S ECN e.i.r.p FEC FIN FTP G/T GSO GW HPA HSP HTML HTTP ICMP IETF I/O IP IPSEC ISP LAN LFN MF-TDMA MPEG MPLS

ITU-R S.7-6 (Maximum segment size) (Maximum transmission unit) (Network news transport protocol) (Network time protocol) (Operating system) (Padding bytes) (Protect against wrapped sequence(s)) (Personal computer(s)) (Protocol data unit) (Performance enhancing proxy) (Random access) (Random access memory) (Rate-based pacing) (Receive window (variable in )) ( ) ( Request for comments (issued ( ) (Slow start threshold (variable in )) ( (Synchronous start segment (used to establish a ( by the IETF)) (Remote page accelerator) (Reed-Solomon) - (Round trip time) (RTT measurement) (Receiver) (Selective acknowledgment) (Single channel per carrier) (Solid state power amplifier) ) ) connection)) ( for transactions) (Token buffer fil) (Trellis coded) (Transmission control protocol) (Time division multiple access) (Travelling wave tube amplifier) (Transmitter) (User datagram protocol) (Uniform/universal resource locator) (Very small aperture terminal) (Wide area network) MSS MTU NNTP NTP OS PAD PAWS PC PDU PEP RA RAM RBP rcvwnd RFC RPA RS RTT RTTM Rx SACK SCPC SSPA ssthres SYN T/ TBF TC TDMA TWTA Tx UDP URL VSAT WAN

7 ITU-R S.7-. 2 - -. ) AB. A B ) BA (R AB B A ).(R BA.((MPLS) (ATM) - -.2 BA(R BA ) AB (R AB ) A B 2. -... VSAT 2.2.2.2 2.

ITU-R S.7-8 2 N. 3 3 2.2.2 N ) VSAT.( 3.2

9 ITU-R S.7-2 2..ITU-R S.248 2.2 KIDDI. ( ). INTELSAT.2. 3.2. 2.2..2. ms 700 WAN ms 200. kbytes 8. Windows NT Windows 98 Windows 95 ms 200 RTT..ms 700 /.(4 ). kbit/s 2..2 3..2 9 kbit/s 320 8 kbytes 8 bits = 320 kbit/s RTT = 200 ms.

ITU-R S.7-0 4 (Mbit/s). kbit/s 536 2.2.2.2 : VSAT :A VSAT. :A :B..2.2 A. (SCPC) UDP UDP kbit/s 384 DAMA.kbit/s 2 048 DAMA.5 A VSAT.VSAT.VSAT.. (2 ).VSAT VSAT %99,85 HUB VSAT %99,9

ITU-R S.7-4 A kbit/s 384 = = kbit/s 536 = kbit/s 2 048 = kbit/s 2 048.. :ES :-GW 7- VSAT (w) SSPA (m) 7,6 Type- 384 0,2 VSAT-A Type-2 536 40,2 VSAT-B Type-2 2 048 40,8 VSAT-C Type-2 2 048 20,8 VSAT-D (Mbit) Iperf.. 256 Pentium III GHz FreeBSD 4,3 VSAT-A Iperf.. 52 Pentium III GHz FreeBSD 4,3 VSAT-B Iperf.. 256 Pentium III GHz FreeBSD 4,3 VSAT-C Iperf.. 52 Pentium III GHz FreeBSD 4,3 VSAT-D 256 Pentium III 600 MHz Windows 2000 NTP server

ITU-R S.7-2 NTP FreeBSD 4.5 Iperf VSAT.. :B 2..2.2. B 8 4 2 5 0 6 0 7 0 8 0 ) (kbit/s 536 kbit/s 384 ).( ) ms 250 ( /. 6. Microsoft Windows 2000 (SP2)..2.4.7 Linux Microsoft Windows 2000 (SP2) 6 B - Cisco2500 ADTECH SX2 Cisco2500 - - 2 iperf.. Windows 2000 2 Linux 2.4.7 Windows 2000 2.2.2 ( (2 ( A.2.2.2 :. (..2.2.2 ) UDP - ) (2..2.2.2 ) / - ) (3..2.2.2 ) / - %40) UDP ( %60) -.(2 ) (4..2.2.2 ) Iperf... Iperf.http://dast.nlanr.net/Projects/Iperf../release.html :

3 ITU-R S.7-. IP/. VSAT. UDP 4 - - 2. %95 UDP..2.2.2 VSAT-D 365 365 365 ( ) (kbit/s 384 2 (%93,8) kbit/s 360,2 : kbit/s 384 ) VSAT-C 365 365 365 VSAT-B 365 365 365 VSAT-A 345 346 346 : VSAT-A VSAT-B VSAT-C VSAT-D (kbit/s 384) ( ) 3 (%95,2) kbit/s 463 : kbit/s 536 : (kbit/s 536 ) VSAT-D VSAT-C kbit/s 463 VSAT-B VSAT-A VSAT-A (kbit/s 384) (kbit/s 2 048 4 (%95,) kbit/s 947,5 : kbit/s 2 048 ) : (kbit/s 2 048) D (kbit/s 2 048) C (kbit/s 536) B (kbit/s 384) A kbit/s 949 kbit/s 946 VSAT-B (kbit/s 536)

ITU-R S.7-4 2..2.2.2 ( ) 5 (%96,9) kbit/s 349,2 : kbit/s 384 : (kbit/s 384 ) VSAT-D VSAT-C VSAT-B VSAT-A 359,0 358,3 357,8 359,0 358,5 359,0 348,3 327,8 328,0 VSAT-A VSAT-B VSAT-C (kbit/s 384) 348,3 358,5 328,0 VSAT-D. 5 ( ) (kbit/s 536 6 (%95,5) kbit/s 397,5 : kbit/s 536 ) : VSAT-D (kbit/s 2 048) VSAT-C (kbit/s 2 048) kbit/s 397,5 VSAT-B (kbit/s 536) VSAT-A (kbit/s 384) VSAT-A (kbit/s 384). 6 ( ) (kbit/s 2 048 7 (%97,) kbit/s 890, : kbit/s 2 048 ) : VSAT-D (kbit/s 2 048) kbit/s 89,8 VSAT-C (kbit/s 2 048) kbit/s 888,3 VSAT-B (kbit/s 536) VSAT-A (kbit/s 384) VSAT-B (kbit/s 536)

5 ITU-R S.7- ( ) (kbit/s 536 8 (%95,5) kbit/s 370,5 : kbit/s 536 ) : 3..2.2.2 VSAT-D (kbit/s 2 048) VSAT-C (kbit/s 2 048) VSAT-B (kbit/s 536) VSAT-A (kbit/s 384) 338 337 329 329 333 360 358 345 345 408 VSAT-A (kbit/s 384) ( ) (kbit/s 2 048 9 (%98,) kbit/s 90 : kbit/s 2 048 ) : VSAT-D (kbit/s 2 048) VSAT-C (kbit/s 2 048) VSAT-B (kbit/s 536) VSAT-A (kbit/s 384) 680 565 657 902 759 597 562 98 VSAT-B (kbit/s 536) UDP 4..2.2.2 VSAT-D (kbit/s 2 048) 02 84 (%40) UDP 0 (kbit/s 384) VSAT-C (kbit/s 2 048) 24 687 VSAT-B (kbit/s 536) (%60).UDP VSAT-A (kbit/s 384) VSAT-B : : B 2.2.2.2. 7 B. 8 2.

ITU-R S.7-6 kbit/s 200 /IP 8 7 ( ) (8 ). Ygn ( ) (9 ) 8.kbit/s 400." " " " Mbit/s,5.0 7 ( 8-0 = BER) ( 6-0 = BER ) BER (ms 250) (ms 250) 8 ( 8-0=BER) (%) (%) 7-07 (ms 250) (ms 250) 7-08

7 ITU-R S.7-9 ( 8-0 = BER) (ms 250) (ms 250) 0 ( 6-0 7-0 = BER) 7-0=BER 6-0=BER (%) (%) 7-09 (ms 250) (ms 250) 7-0

ITU-R S.7-8 (%00 = ) (%99 = ) (ms 250) (ms 250) 7- %95. 7-0 BER. 8... 3.2.2 3.2.3.2.2... Cisco 7206 2 048 Sun Enterprise 450 (2 UltraSPARC-II 296 MHz). -.Solaris 7

9 ITU-R S.7- ( ) HSSI 0 HSSI FE FE FE3 2 ( ) ( ).. : : 2.3.2 Internet-2. :2 ISP ms 700 WAN ms 200.. ms 200 ms 500. :3.. ms 500. ms 200. ms 200 ( ) (R) IDSU/CSU IDSU/CSU Mbit/s 00 "" 3.3.2.3.3.2 3 (R2) 7-2

ITU-R S.7-20..ms 700 4 ms 700 ms 200 ms 700.. 3 Mbit/s 45 : :Mentat Mbit/s 43 :Sky X ms 200 : 7-3 4 : Mbit/s 45 :Mentat Mbit/s 43 :Sky X ms 700 : (Mbit/s) 7-4

2 ITU-R S.7-2.3.3.2 (ISP)..ISP ms 700 ms 200.kbit/s 28.. 3.3.3.2 6 5 kbit/s 28. kbit/s 28.Mbit/s 45 350 ms 200. 5. ms 700... 350 6 Mbit/s 3 5 (Mbit/s) kbit/s 28 Mbit/s 45 ms 200 0-7 BER : : : 0-6 BER 0-8 BER 0-5 BER 7-5

ITU-R S.7-22 (Mbit/s) 6 0-7 BER 0-6 BER 0-8 BER 0-5 BER ms 200 7..ms 700 7 8 7 8 4.3.3.2 (Mbit/s) 45,60 40,75 35,88 3,02 26,6 230 6,44,58 6,72,86 ms 700 kbit/s 28 : Mbit/s 45 : : 7-6 kbit/s 28 Mbit/s 45 ms 700 0-7 BER 0-6 BER : : : Mbit/s 43 :SkyX 0-8 BER 0-5 BER 7-7

23 ITU-R S.7-8 (Mbit/s) kbit/s 28 Mbit/s 45 ms 700 0-7 BER 0-6 BER : : :Mentat : Mbit/s 43 :Sky X 0-8 BER 0-5 BER 7-8.. 280 %00 3.3.3.2.( 500 5-0 BER ) %0 Mbit/s 0 Mbit/s 33 350 %0. 5.3.3.2.. ms 500.. ms 200. 9 8 6 9..

ITU-R S.7-24 9 (Mbit/s) ms 700 0-7 BER 0-6 BER kbit/s 28 : Mbit/s 45 : :Mentat : Mbit/s 43 :SkyX 0-8 BER 0-5 BER 7-9 4.3.2 /.ms 700. 7-0 (BER) 3.3. 20. ( ). (HITRI) (KT)...

25 ITU-R S.7-20 7-20 2.3.VSAT. 3 3. 2.2.3 IDU/ODU ACQ: 9.0 PING: 686 ms PTS: VSAT_4b_uts 9,2 Mbit/s 45 VSAT 6 MHz,040 2 Mugunghwa-3 : MHz 36 : 23 ) : (khz 480 MHz 24,8 (GHz 2/GHz 4) Ku-band kbit/s 28 ~ kbit/s 256 Mbit/s 23,58 : :

ITU-R S.7-26 MB MB 384 MB 768 64 VSAT 3 LAN 2.. 22 :.Mbit/s 45 2.2.3 www.naver.com www.google.com www.hansei.ac.kr :A :B :C. www.kbstar.co.kr : 2 :D :/ - : - : - VSAT (IDU) IP. : -.. IP. 22.

27 ITU-R S.7-2 Mugonghwa 6 MHz 35 GHz 2/4 www.naver.com www.google.com www.hansei.ac.kr 2 3 m 9 IP ( ) 25 Mbit/s 28 kbit/s - 256 kbit/s VSAT VSAT VSAT www.kbstar.co.kr 4 IP () 2 3 4 7-2 22 www.naver.com www.google.com www.hansei.ac.kr WAN 45 Mbit/s LAN (00 Mbit/s) www.kbstar.co.kr 7-22 5) 2.2.3 3.2.3 5 2 20 (.4

(kbyte/sec) ITU-R S.7-4 (s) 28 :4 :3 :2 : (kbytes/s) (s) (kbytes/s) (s) (kbytes/s) (s) (kbytes/s) (s) (kbytes/s) (s) 27,8 4, 24,7 5,6 9,7 44,9 0,3 35,7 0,8 3,5 A 3, 5,2 2,9 5,9,6 9,8 2, 9,5,9,4 B 54,3 4,7 30,4 3, 3,9 44,3 3, 56,9 3,7 5,9 C 7,9 3,0 0,9 5,4 7,7 22,9 6, 28,4 99, 6, D www.naver.com www.google.com www.hansei.ac.kr. www.kbstar.co.kr :A :B :C :D

29 ITU-R S.7- /IP. ) B ( ) A. ( ),8 (C ) 4,2 (B ),5 VSAT.((C ) 3,9 (B ) ATM 2.4..4 3.4. ATM 4.4. ATM..- ATM 23 5 ETRI 7 - ATM. CRL :Mbit/s 55 Mukungwha-3 : - GHz 2,2-7,7 GHz 3-27,5 : : - W 25 :TWAT - dbw 7 :(Mukungwha-3) (e.i.r.p.) - ( ) db/k 32 :( 45 ) G/T - (TC8-PSK) PSK TC 8- / - 8/7 = R 7 = K : -.Mbit/s 55,52 : -.MHz 80 : - OC-3 ATM.(GSO). ATM ATM.(IPv6) (IPv4).MPEG -. 25 24. ATM 3.3 4.4

ITU-RR S.7-300 23-7 5 7-23 24 ATM OC/3 AT TM 7-24

3 ITU-R S.7- TPC 25 PC TPC 7-24 ATM ATM IPv6 IPv4/IPv6.ms 540 (GSO) IPv4/IPv6 26. ATM.ATM ATM IPv4/IPv6 26 2.4 MTU. 9 80 ATM MTU (MSS). 20 IPv4 9 60 IPv4/IPv6.( 20 40 IPv6 ) 9 00 MSS ATM AAL5. :. PAD = 48 ((8+ 20+ 40+ 20+ 900+ 8) MOD48) = 20 : (PDU) 900 900 η = = = 0.986 (8+ 20 + 40 + 20 + 900 + 20 + 8) 9224

OC-3 48 ITU-R S.7-32 BW STM-.Mbit/s 34,94 ATM : Mbit/s 49 = 34.94 η 33.05 Mbit/s. ( ) 27.IPv6 Mbit/s 06 IPv4 Mbit/s 3 Mbit/s 6 ATM. %95.ms 540 (GSO) 27 ATM (Mbit/s) ATM (Mbytes) (IPv4) 7-27 ms 540 6.. Mbit/s 3 2.LFN ( ) LFN..ATM.. 28..... ( ).( 27 ) 3.4

33 ITU-R S.7-28 (Mbit/s) TPC (s) 7-28. ATM.29. Mbit/s 35 Mbit/s 500 29.3.3 2 2 7-29 (GSO). (IPv6) 430 MSS ATM : BW RTT W = 8 6 35 0 0.540 = 6 374 8 430 (R > R2) ATM R2 R R2 2 = R.( ) R2 W max.(ack) : P( t) = [ R R2] t = [2 R2 R2] t = R2 t T T T W t =,2,3 L max R2 R2 R2 2 R2. T

ITU-R S.7-34 Wmax W 2 max W P = R = 2 R2 2 R2 2 : ACK.(RTT). Mbit/s 35 Mbit/s 500 ATM 30.2 3 30. 3 87 3. ACK 6 374.. 2 279 max 30 (s) 7-30

35 ITU-R S.7-3 (Mbit/s) () 7-3 ) TBF Rate.TBF 32. TBF.(Linux. -. Burst Size Bucket size.... 2.3.3 TBF 32 =

ITU-R S.7-36 TBF 33 34.( ) Mbytes 6. kbits 30-20.. Mbytes 30 TBF 33 (Mbit/s) (Mbytes) 7-33 34 (Mbit/s) (kbytes) 7-34

37 ITU-R S.7- :.(GSO) Mbit/s 55.Mbytes 6 4.4 2. ATM. : :..( %95 ) Mbit/s 95 3.. %90....5. Star One 2.5..2.5 3.5. 5.5.() (). IP. 35..5 Hub.. DVB-S VSAT.

ITU-R S.7-38 35 (B A) 7-35 2..5 VSAT.2..5 ( ) MHz 4 24 MHz 4 068.( ) MHz 99 MHz 774.kbit/s 76,8 () 40 Mbit/s 48 () (B A ) (3 2 ). VSAT 8 000 GHz /4.ms 800 VSAT 200 320 (HSPs) VSAT 3 200 VSAT 3 600 E b /N 0 :(A ) HSP :(A ) : 2 HSP :(B ) 3. 5 VSAT.6 5 VSAT 50 SSPA (W) (m) 0,96 3 2

39 ITU-R S.7- DVB-S E b / N 0 (db) 6 4,5 5,0 5,5 6,0 6,4 /2 2/3 3/4 5/6 7/8 MPEG-2 Hub 2.2..5 VSAT (Hub) DVB-S.37 36 IP IP MPEG-2 36 DVB-S MPEG MPEG-2 DVB-S 7-36 (bytes 4) 37 MPEG (bytes 84) MPEG-2 - QPSK

RA ITU-R S.7-40 MF-TDMA ( ).38 DA 38 7-38. 3 2 2.5.3 2.2.5 7.2003 200. ( ) 3 2 2.2.5 9 8.2004

4 ITU-R S.7-7 3 2 %,4 %, %0,2 %0,0 %0,0 %0,0 %0,0 %0,0 %0,0 %0,0 %0, %0, %0,2 99,9 99,9 00,0 00,0 00,0 99,9 00,0 00,0 00,0 99,0 00,0 00,0 00,0 00,0 00,0 00,0 00,0 00,0 99,9 99,9 00,0 99,9 00,0 00,0 99,9 00,0 00,0 00,0 00,0 00,0 00,0 99,9 00,0 00,0 00,0 HSP 3 307,58 306,63 324,09 298,70 2 8 HSP 2 309,02 309,50 32,36 299,06 HSP 30,33 3,76 37,44 304,03 2 308,97 307,66 39, 302,3 HSP 4 266,74 266,99 282,42 249,46 HSP 3 266,74 266,99 282,42 249,46 3 9 HSP 2 25,04 252,5 259,45 24,94 HSP 247,09 246,87 256,94 237,55 3 253,05 253,24 262,35 243,98

ITU-R S.7-42 3.2.5 ( ) 3 2 2 20.2004 20 HSP 3 6,30 7,00 7,99 3,5 2 (Gbyte) HSP 2 6,2 7,00 8,0 3,80 HSP 5,72 6,60 7,57 3,5 2 6,08 7,02 7,65 3,56 2 HSP 4 3,58 3,88 5,4,89 HSP 3 5,74 6,35 7,54 2,63 3 (Gbyte) HSP 2 4,58 4,65 6,34 2,39 HSP 5,44 6,26 7,44 2,79 3 4,84 5,33 6,33 2,64 IP VSAT. IP. ((HTTP).2000 (FTP) ) CRL ETRI.ATM HTTP FTP -.Ka MUKUNGWHA-3 HTTP FTB 2.6 HTTP 3.5..6 3.6.FTP. 4.6.HTTP 6

43 ITU-R S.7- ATM./ ATM 39. CRL m 5 ETRI 7..4 - ATM.6 ETRI, Taejeon 39 ATM Ka-band Mukungwha-3 CRL, Kitakyushu ATM m 7 RF m 5 RF PC 55 Mbit/s ATM 55 Mbit/s ATM 7-39.Linux CRL HTTP FTP Windows 2000 ETRI.ATM ATM :. Linux.ATM.. FTP. WUFTPD 2.6. NCFTP FTP WUFTPD. NCFTP 3.0.Linux Apache.3.2 HTTP HTTP. HTTP.0.Mbytes 0.HTTP. W3C Webbot 5.2.8 HTTP.0 Linux Netscape 4.77 :.tcptrace HTTP tcpdump.22 HTTP

ITU-R S.7-44 22 (bytes) 22 207 80 333 76 05 393 672 72 03 30 2 33 6 8 China2008 CRL FIFA LionKing RBLAB OC-3 FTP.ATM FTP Mbit/s 8,32 Mbit/s 55 FTP FTP Mbytes 92,.( %87,5 ) Kbytes 64 FTP 40.. 2.6 4,0 Mbit/s 55 40 FTP 3,0 (Mbit/s) 2,0,0 0,0 0,5,5 2,5 3,5 (Mbytes) 7-40 / CPU FTP 42 4..Mbytes

45 ITU-R S.7- ) 42.(. 38 4. FTP.. / (Mbyte 4 = ) (Mbit/s) (s) 7-4 (Mbyte 600 000 42 = ) (bytes) 400 000 200 000 0 20 30 40 (s) 7-42

ITU-R S.7-46 OC-3 HTTP HTTP.0.3.6 HTTP.0 HTTP.0 43. HTTP. HTML... 3.6 43 HTTP.0 " " HTTP.0 " " HTTP.0.HTTP. HTTP 44..." ". 7-43 2.3.6 44 " " - HTTP.0 / 7-44 HTTP..HTTP. " "... HTTP HTLM.. HTTP. 45. (RTT) 3.3.6

47 ITU-R S.7-45 7-45 HTTP.. HTTP... HTTP. 4.3.6 46. 46. HTTP 23.HTTP HTTP. ) (Webbot) Netscape.(. HTTP.0. HTTP.0.. HTTP.. 5.3.6

ITU-R S.7-48. ( ).( ) (bit/s) 4 373 0 030 48 638 9 296 5 930 24 74 3 49 8 22 40 690 47 562 3 42 80 637 6 58 025 8 865 (s) 4,764 2,58 4,363 8,642 3,547 3,247 3,054 2,682 4,328 8,277 2,529 4,882 4,365 6,540 3,822 655 306 38 307 33 37 55 282 285 660 54 564 66 04 9 HTTP 23 4 22 34 4 8 Netscape 4.77 Webbot Webbot Netscape 4.77 Webbot Webbot Netscape 4.77 Webbot Webbot Netscape 4.77 Webbot Webbot Netscape 4.77 Webbot Webbot China2008 30) 22 207 ( ( CRL 2) 80 333 FIFA 33) 76 05 ( ( LionKing 6) 393 672 RBLAB 8) 72 03 (.HTML HTTP GET GET. (RTT) GET HTTP.... HTTP.0 ( 47.( ) RBLAB 47.. ( 47. 2.HTTP GET (( 47 ) HTTP.0.HTTP. HTTP. RBLAB... HTTP..

49 ITU-R S.7-47 RBLAB (s) (netscape) " " HTTP.0 ( (s) (s) (webbot) " " HTTP. ( (webbot) " " HTTP. ( 7-47

ITU-R S.7-50..GSO LFN. HTTP..Mbytes Mbit/s 3 FTP. Mbytes.. /. HTTP. HTTP 4.6. : ).(2 ) 7 0 7 -.(5 3 2.(3 ) %90..(4 ) %95.(4 ) /.(6 ) HTTP..(6 ) - - - - - -