rfc1128.ps

RFC 的详细文档！

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300 1724 473 3 (Status of this Memo)fjt
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300 1626 1889 14 (This paper describes a series of experiments involving over 100,000 hosts of the Internet syst)fjt
2189 1626 61 0 (em)fjt
300 1567 1950 15 (and located in the U.S., Europe and the Pacific. The experiments are designed to evaluate the)fjt
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300 1451 1950 13 (DARPA/NSF Internet and the Network Time Protocol \(NTP\), which is specified as an Internet)fjt
300 1393 1950 14 (Standard in RFC-1119. NTP is designed specifically for use in a large, diverse internet system)fjt
300 1334 1950 14 (operating at speeds from mundane to lightwave. In NTP a distributed subnet of time servers)fjt
300 1276 1826 9 (operating in a self-organizing, hierarchical, master-slave configuration exchange precision )fjt
2126 1276 108 0 (times)fjt
2234 1276 17 0 (-)fjt
300 1218 1934 16 (tamps in order to synchronize subnet clocks to each other and national time standards via wire o)fjt
2234 1218 17 0 (r)fjt
300 1160 115 0 (radio.)fjt
300 1062 1950 15 (The experiments are designed to locate Internet hosts and gateways that provide time by one of)fjt
300 1003 1831 13 (three time distribution protocols and evaluate the accuracy of their indications. For those hos)fjt
2131 1003 119 1 (ts that)fjt
300 945 1845 13 (support NTP, the experiments determine the distribution of errors and other statistics over )fjt
2145 945 105 0 (paths)fjt
300 887 1845 13 (spanning major portions of the globe. Finally, the experiments evaluate the accuracy and relia)fjt
2145 887 105 0 (bility)fjt
300 829 1950 12 (of precision timekeeping using NTP and typical Internet paths involving DARPA, NSFNET and)fjt
300 770 1950 10 (other agency networks. The experiments demonstrate that timekeeping accuracy throughout most)fjt
300 712 1826 15 (portions of the Internet can be ordinarily maintained to within a few tens of milliseconds, e)fjt
2126 712 124 1 (ven in)fjt
300 654 1290 10 (cases of failure or disruption of clocks, time servers or networks.)fjt
300 556 1579 12 (This memo does not specify a standard. Distribution of this memo is unlimited.)fjt
300 457 1818 9 (Keywords: internet clock synchronization, standard time distribution, Internet protocol, tim)fjt
2118 457 116 0 (ekeep)fjt
2234 457 17 0 (-)fjt
300 399 332 1 (ing experiments.)fjt
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300 3041 532 2 (Network Working Group)fjt
2032 3041 218 2 (D. L. Mills)fjt
300 2982 637 3 (Request for Comments 1128)fjt
1752 2982 498 2 (University of Delaware)fjt
1948 2924 302 1 (October 1989)fjt
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300 279 100 0 (Mills)fjt
2109 279 141 1 (Page i)fjt
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300 2841 421 2 (Table of Contents)fjt
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300 2753 38 0 (1.)fjt
450 2753 259 1 ( Introduction)fjt
713 2753 1500 40 ( . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .)fjt
2225 2753 25 0 (1)fjt
300 2695 75 0 (1.1.)fjt
450 2695 914 5 ( Standard Time and Frequency Dissemination)fjt
1388 2695 825 22 ( . . . . . . . . . . . . . . . . . . . . . .)fjt
2225 2695 25 0 (2)fjt
300 2637 75 0 (1.2.)fjt
450 2637 576 4 ( The Network Time Protocol)fjt
1050 2637 1163 31 ( . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .)fjt
2225 2637 25 0 (2)fjt
300 2579 75 0 (1.3.)fjt
450 2579 689 4 ( Determining Time and Frequency)fjt
1163 2579 1050 28 ( . . . . . . . . . . . . . . . . . . . . . . . . . . . .)fjt
2225 2579 25 0 (3)fjt
300 2520 38 0 (2.)fjt
450 2520 661 3 ( Discovering Internet Timetellers)fjt
1125 2520 1088 29 ( . . . . . . . . . . . . . . . . . . . . . . . . . . . . .)fjt
2225 2520 25 0 (5)fjt
300 2462 75 0 (2.1.)fjt
450 2462 719 4 ( Evaluation of Timekeeping Quality)fjt
1200 2462 1013 27 ( . . . . . . . . . . . . . . . . . . . . . . . . . . .)fjt
2225 2462 25 0 (7)fjt
300 2404 75 0 (2.2.)fjt
450 2404 231 1 ( Discussion)fjt
713 2404 1500 40 ( . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .)fjt
2225 2404 25 0 (7)fjt
300 2346 38 0 (3.)fjt
450 2346 440 4 ( Survey of NTP Hosts)fjt
900 2346 1313 35 ( . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .)fjt
2225 2346 25 0 (8)fjt
300 2287 75 0 (3.1.)fjt
450 2287 642 5 ( Errors Due to Statistical Delays)fjt
1125 2287 1088 29 ( . . . . . . . . . . . . . . . . . . . . . . . . . . . . .)fjt
2225 2287 25 0 (9)fjt
300 2229 75 0 (3.2.)fjt
450 2229 810 6 ( Errors due to Radio Propagation Effects)fjt
1275 2229 900 24 ( . . . . . . . . . . . . . . . . . . . . . . . .)fjt
2200 2229 50 0 (12)fjt
300 2171 75 0 (3.3.)fjt
450 2171 793 7 ( Errors due to Radio Clock Phase Noise)fjt
1275 2171 900 24 ( . . . . . . . . . . . . . . . . . . . . . . . .)fjt
2200 2171 50 0 (14)fjt
300 2113 38 0 (4.)fjt
450 2113 259 1 ( Conclusions)fjt
713 2113 1463 39 ( . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .)fjt
2200 2113 50 0 (16)fjt
300 2054 38 0 (5.)fjt
450 2054 233 1 ( References)fjt
713 2054 1463 39 ( . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .)fjt
2200 2054 50 0 (16)fjt
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300 1967 343 2 (List of Figures)fjt
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300 1879 774 5 (Figure 1. Calculating Delay and Offset)fjt
1088 1879 1125 30 ( . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .)fjt
2225 1879 25 0 (4)fjt
300 1821 794 5 (Figure 2. Error Distribution by Protocol)fjt
1125 1821 1088 29 ( . . . . . . . . . . . . . . . . . . . . . . . . . . . . .)fjt
2225 1821 25 0 (6)fjt
300 1763 505 4 (Figure 3. Offset vs Delay)fjt
825 1763 1350 36 ( . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .)fjt
2200 1763 50 0 (10)fjt
300 1705 440 3 (Figure 4. Raw Offsets)fjt
750 1705 1425 38 ( . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .)fjt
2200 1705 50 0 (11)fjt
300 1646 503 3 (Figure 5. Filtered Offsets)fjt
825 1646 1350 36 ( . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .)fjt
2200 1646 50 0 (11)fjt
300 1588 843 6 (Figure 6. Error Distribution for NTP hosts)fjt
1163 1588 1013 27 ( . . . . . . . . . . . . . . . . . . . . . . . . . . .)fjt
2200 1588 50 0 (12)fjt
300 1530 783 5 (Figure 7. Radio Clock Frequency Error)fjt
1088 1530 1088 29 ( . . . . . . . . . . . . . . . . . . . . . . . . . . . . .)fjt
2200 1530 50 0 (15)fjt
300 1472 697 5 (Figure 8. Radio Clock Offset Error)fjt
1013 1472 1163 31 ( . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .)fjt
2200 1472 50 0 (15)fjt
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300 1384 321 2 (List of Tables)fjt
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300 1297 747 5 (Table 1. Time Responses by Protocol)fjt
1050 1297 1163 31 ( . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .)fjt
2225 1297 25 0 (5)fjt
300 1239 761 5 (Table 2. Time Responses by Category)fjt
1088 1239 1125 30 ( . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .)fjt
2225 1239 25 0 (9)fjt
300 1180 679 4 (Table 3. Radio Propagation Delay)fjt
1013 1180 1163 31 ( . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .)fjt
2200 1180 50 0 (13)fjt
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