{"id":3981,"date":"2025-11-06T11:12:00","date_gmt":"2025-11-06T11:12:00","guid":{"rendered":"https:\/\/lp.szlogic.cn\/glossary\/what-you-should-know-about-precision-time-protocol-ptp\/"},"modified":"2026-06-22T05:29:43","modified_gmt":"2026-06-22T05:29:43","slug":"what-you-should-know-about-precision-time-protocol-ptp","status":"publish","type":"post","link":"https:\/\/resourceslp.szlogic.cn\/vi\/glossary\/what-you-should-know-about-precision-time-protocol-ptp","title":{"rendered":"Giao th\u1ee9c Th\u1eddi gian Ch\u00ednh x\u00e1c (PTP) l\u00e0 g\u00ec? H\u01b0\u1edbng d\u1eabn To\u00e0n di\u1ec7n"},"content":{"rendered":"
\"What<\/figure>\n\n\n\n

Tr\u01b0\u1edbc PTP, Giao th\u1ee9c Th\u1eddi gian M\u1ea1ng (NTP)<\/strong> l\u00e0 ti\u00eau chu\u1ea9n \u0111\u1ec3 \u0111\u1ed3ng b\u1ed9 h\u00f3a \u0111\u1ed3ng h\u1ed3 qua m\u1ea1ng. M\u1eb7c d\u00f9 NTP r\u1ea5t xu\u1ea5t s\u1eafc trong vi\u1ec7c \u0111\u1ed3ng b\u1ed9 h\u00f3a v\u1edbi \u0111\u1ed9 ch\u00ednh x\u00e1c \u0111\u1ebfn mili gi\u00e2y, \u0111i\u1ec1u n\u00e0y ph\u00f9 h\u1ee3p cho nhi\u1ec1u \u1ee9ng d\u1ee5ng CNTT, nh\u01b0ng c\u00e1c h\u1ec7 th\u1ed1ng c\u00f4ng nghi\u1ec7p v\u00e0 t\u00e0i ch\u00ednh hi\u1ec7n \u0111\u1ea1i \u0111\u00f2i h\u1ecfi \u0111\u1ed9 ch\u00ednh x\u00e1c cao h\u01a1n nhi\u1ec1u.<\/p>\n\n\n\n

Giao th\u1ee9c Th\u1eddi gian Ch\u00ednh x\u00e1c (Precision Time Protocol), \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a b\u1edfi ti\u00eau chu\u1ea9n IEEE 1588, \u0111\u01b0\u1ee3c ph\u00e1t tri\u1ec3n nh\u1eb1m l\u1ea5p \u0111\u1ea7y kho\u1ea3ng tr\u1ed1ng n\u00e0y. N\u00f3 \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 \u0111\u1ed3ng b\u1ed9 h\u00f3a \u0111\u1ed3ng h\u1ed3 trong m\u1ed9t h\u1ec7 th\u1ed1ng ph\u00e2n t\u00e1n v\u1edbi \u0111\u1ed9 ch\u00ednh x\u00e1c d\u01b0\u1edbi micro gi\u00e2y<\/strong> qua m\u1ed9t m\u1ea1ng c\u1ee5c b\u1ed9 (LAN)<\/strong><\/a>. \u0110i\u1ec1u n\u00e0y khi\u1ebfn n\u00f3 tr\u1edf n\u00ean kh\u00f4ng th\u1ec3 thi\u1ebfu trong c\u00e1c l\u0129nh v\u1ef1c m\u00e0 vi\u1ec7c \u0111\u1ed3ng b\u1ed9 th\u1eddi gian kh\u00f4ng ch\u1ec9 ti\u1ec7n l\u1ee3i m\u00e0 c\u00f2n mang t\u00ednh then ch\u1ed1t.<\/p>\n\n\n\n

\ud83d\udcdc Giao th\u1ee9c Th\u1eddi gian Ch\u00ednh x\u00e1c (PTP) l\u00e0 g\u00ec? Ph\u00e2n t\u00edch k\u1ef9 thu\u1eadt chuy\u00ean s\u00e2u<\/strong><\/h2>\n\n\n\n

V\u1ec1 b\u1ea3n ch\u1ea5t, PTP<\/strong> l\u00e0 m\u1ed9t giao th\u1ee9c cho ph\u00e9p \u0111\u1ed3ng b\u1ed9 h\u00f3a ch\u00ednh x\u00e1c c\u00e1c \u0111\u1ed3ng h\u1ed3 tr\u00ean to\u00e0n m\u1ea1ng. Kh\u00e1c v\u1edbi NTP, th\u01b0\u1eddng ho\u1ea1t \u0111\u1ed9ng theo ki\u1ebfn tr\u00fac ph\u00e2n c\u1ea5p kh\u00e1ch-ch\u1ee7, PTP s\u1eed d\u1ee5ng m\u1ed9t ki\u1ebfn tr\u00fac ch\u1ee7-t\u1edb (master-slave)<\/strong> tinh vi h\u01a1n v\u00e0 d\u1ef1a v\u00e0o \u0111\u00e1nh d\u1ea5u th\u1eddi gian ph\u1ea7n c\u1ee9ng (hardware timestamping) \u0111\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c \u0111\u1ed9 ch\u00ednh x\u00e1c \u0111\u00e1ng kinh ng\u1ea1c.<\/p>\n\n\n\n

M\u1ee5c ti\u00eau ch\u00ednh c\u1ee7a PTP l\u00e0 \u0111o l\u01b0\u1eddng v\u00e0 b\u00f9 tr\u1eeb c\u00e1c \u0111\u1ed9 tr\u1ec5 m\u1ea1ng g\u00e2y ra s\u1ef1 ch\u00eanh l\u1ec7ch gi\u1eefa c\u00e1c \u0111\u1ed3ng h\u1ed3. N\u00f3 th\u1ef1c hi\u1ec7n \u0111i\u1ec1u n\u00e0y b\u1eb1ng c\u00e1ch trao \u0111\u1ed5i m\u1ed9t chu\u1ed7i tin nh\u1eafn c\u00f3 \u0111\u00e1nh d\u1ea5u th\u1eddi gian gi\u1eefa \u0111\u1ed3ng h\u1ed3 ch\u1ee7 (ngu\u1ed3n th\u1eddi gian ch\u00ednh x\u00e1c nh\u1ea5t) v\u00e0 c\u00e1c \u0111\u1ed3ng h\u1ed3 t\u1edb (c\u00e1c \u0111\u1ed3ng h\u1ed3 c\u1ea7n \u0111\u01b0\u1ee3c \u0111\u1ed3ng b\u1ed9 h\u00f3a).<\/p>\n\n\n\n

C\u00e1c b\u01b0\u1edbc ch\u00ednh trong qu\u00e1 tr\u00ecnh \u0111\u1ed3ng b\u1ed9 h\u00f3a PTP:<\/strong><\/h4>\n\n\n\n
    \n

  1. Tin nh\u1eafn Sync v\u00e0 Follow-Up:<\/strong> \u0110\u1ed3ng h\u1ed3 ch\u1ee7 g\u1eedi tin nh\u1eafn Sync<\/mark> , ghi l\u1ea1i th\u1eddi \u0111i\u1ec3m ch\u00ednh x\u00e1c (t1) m\u00e0 tin nh\u1eafn \u0111\u01b0\u1ee3c g\u1eedi \u0111i. N\u1ebfu ph\u1ea7n c\u1ee9ng h\u1ed7 tr\u1ee3, n\u00f3 ngay l\u1eadp t\u1ee9c g\u1eedi tin nh\u1eafn Theo_d\u00f5i<\/mark> ch\u1ee9a ch\u00ednh x\u00e1c d\u1ea5u th\u1eddi gian t1.<\/p><\/li>

  2. Y\u00eau c\u1ea7u v\u00e0 ph\u1ea3n h\u1ed3i \u0111\u1ed9 tr\u1ec5:<\/strong> \u0110\u1ed3ng h\u1ed3 t\u1edb sau \u0111\u00f3 g\u1eedi tin nh\u1eafn Y\u00eau_c\u1ea7u_tr\u00ec_ho\u00e3n<\/mark> tr\u1edf l\u1ea1i \u0111\u1ed3ng h\u1ed3 ch\u1ee7, ghi l\u1ea1i th\u1eddi \u0111i\u1ec3m (t3) m\u00e0 tin nh\u1eafn \u0111\u01b0\u1ee3c g\u1eedi \u0111i. \u0110\u1ed3ng h\u1ed3 ch\u1ee7 nh\u1eadn \u0111\u01b0\u1ee3c tin nh\u1eafn t\u1ea1i th\u1eddi \u0111i\u1ec3m t4 v\u00e0 g\u1eedi l\u1ea1i tin nh\u1eafn Ph\u1ea3n_h\u1ed3i_tr\u00ec_ho\u00e3n<\/mark> k\u00e8m theo d\u1ea5u th\u1eddi gian t4.<\/p><\/li>\n<\/ol>\n\n\n\n

    V\u1edbi b\u1ed1n d\u1ea5u th\u1eddi gian n\u00e0y (t1, t2, t3, t4), \u0111\u1ed3ng h\u1ed3 t\u1edb c\u00f3 th\u1ec3 t\u00ednh to\u00e1n c\u1ea3 \u0111\u1ed9 l\u1ec7ch (offset)<\/strong> so v\u1edbi \u0111\u1ed3ng h\u1ed3 ch\u1ee7 v\u00e0 \u0111\u1ed9 tr\u1ec5 m\u1ea1ng (network delay)<\/strong>, t\u1eeb \u0111\u00f3 \u0111i\u1ec1u ch\u1ec9nh b\u1ea3n th\u00e2n v\u1edbi \u0111\u1ed9 ch\u00ednh x\u00e1c c\u1ef1c cao.<\/p>\n\n\n\n

    \ud83d\udcdc PTP so v\u1edbi NTP: So s\u00e1nh tr\u1ef1c ti\u1ebfp<\/strong><\/h2>\n\n\n\n

    Module Not Detected \/ Errors<\/p> PTP<\/strong> v\u01b0\u1ee3t tr\u1ed9i h\u01a1n so v\u1edbi NTP<\/strong>? B\u1ea3ng sau \u0111\u00e2y tr\u00ecnh b\u00e0y chi ti\u1ebft nh\u1eefng kh\u00e1c bi\u1ec7t ch\u00ednh \u2014 \u0111i\u1ec1u ki\u1ec7n thi\u1ebft y\u1ebfu cho b\u1ea5t k\u1ef3 ai \u0111ang l\u00ean k\u1ebf ho\u1ea1ch tri\u1ec3n khai d\u1ef1 \u00e1n \u0111\u1ed3ng b\u1ed9 h\u00f3a m\u1ea1ng \u0111\u1ed9 ch\u00ednh x\u00e1c cao<\/strong> .<\/p>\n\n\n\n

    \n\n<\/colgroup>

    \u0110\u1eb7c t\u00ednh<\/p><\/th>

    Giao th\u1ee9c Th\u1eddi gian Ch\u00ednh x\u00e1c (PTP)<\/p><\/th>

    Giao th\u1ee9c Th\u1eddi gian M\u1ea1ng (NTP)<\/a><\/p><\/th><\/tr>

    \u0110\u1ed9 ch\u00ednh x\u00e1c<\/strong><\/p><\/td>

    T\u1eeb d\u01b0\u1edbi micro gi\u00e2y \u0111\u1ebfn nano gi\u00e2y<\/strong><\/p><\/td>

    Mili gi\u00e2y<\/p><\/td><\/tr>

    Ki\u1ebfn tr\u00fac<\/strong><\/p><\/td>

    Ch\u1ee7-t\u1edb (ph\u00e2n c\u1ea5p)<\/p><\/td>

    M\u00e1y kh\u00e1ch\u2013m\u00e1y ch\u1ee7<\/p><\/td><\/tr>

    G\u1eafn d\u1ea5u th\u1eddi gian<\/strong><\/p><\/td>

    D\u1ef1a tr\u00ean ph\u1ea7n c\u1ee9ng<\/strong> (trong c\u00e1c b\u1ed9 chuy\u1ec3n m\u1ea1ch v\u00e0 b\u1ed9 \u0111i\u1ec1u khi\u1ec3n giao di\u1ec7n m\u1ea1ng (NIC)
    <\/strong><\/a>)<\/p><\/td>

    D\u1ef1a tr\u00ean ph\u1ea7n m\u1ec1m<\/p><\/td><\/tr>

    Tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng ch\u00ednh<\/strong><\/p><\/td>

    T\u1ef1 \u0111\u1ed9ng h\u00f3a c\u00f4ng nghi\u1ec7p, T\u00e0i ch\u00ednh, Vi\u1ec5n th\u00f4ng<\/p><\/td>

    M\u1ea1ng CNTT, \u0110i\u1ec7n to\u00e1n t\u1ed5ng qu\u00e1t<\/p><\/td><\/tr>

    Ph\u1ee5 thu\u1ed9c v\u00e0o m\u1ea1ng<\/strong><\/p><\/td>

    Y\u00eau c\u1ea7u thi\u1ebft b\u1ecb m\u1ea1ng h\u1ed7 tr\u1ee3 PTP<\/p><\/td>

    Ho\u1ea1t \u0111\u1ed9ng tr\u00ean c\u00e1c m\u1ea1ng IP ti\u00eau chu\u1ea9n<\/p><\/td><\/tr>

    Ti\u00eau chu\u1ea9n<\/strong><\/p><\/td>

    IEEE 1588<\/p><\/td>

    RFC 5905<\/p><\/td><\/tr><\/tbody>\n<\/table>\n<\/figure>\n\n\n\n

    Nh\u01b0 b\u1ea1n c\u00f3 th\u1ec3 th\u1ea5y, \u0111\u1ed1i v\u1edbi c\u00e1c \u1ee9ng d\u1ee5ng m\u00e0 t\u1eebng nanogi\u00e2y \u0111\u1ec1u quan tr\u1ecdng, PTP l\u00e0 ng\u01b0\u1eddi chi\u1ebfn th\u1eafng kh\u00f4ng th\u1ec3 tranh c\u00e3i<\/strong>. Vi\u1ec7c tri\u1ec3n khai m\u1ed9t c\u01a1 s\u1edf h\u1ea1 t\u1ea7ng PTP b\u1ec1n v\u1eefng th\u01b0\u1eddng \u0111\u00f2i h\u1ecfi c\u00e1c th\u00e0nh ph\u1ea7n chuy\u00ean d\u1ee5ng, bao g\u1ed3m \u0110\u1ed3ng h\u1ed3 ch\u1ee7 PTP<\/strong> v\u00e0 thi\u1ebft b\u1ecb m\u1ea1ng h\u1ed7 tr\u1ee3 g\u1eafn d\u1ea5u th\u1eddi gian b\u1eb1ng ph\u1ea7n c\u1ee9ng.<\/p>\n\n\n\n

    \ud83d\udcdc PTP \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u1edf \u0111\u00e2u? C\u00e1c \u1ee9ng d\u1ee5ng ch\u1ee7 ch\u1ed1t<\/strong><\/h2>\n\n\n\n

    \u0110\u1ed9 ch\u00ednh x\u00e1c v\u00f4 song c\u1ee7a PTP<\/strong> \u0111\u00e3 khi\u1ebfn n\u00f3 tr\u1edf th\u00e0nh m\u1ed9t c\u00f4ng ngh\u1ec7 n\u1ec1n t\u1ea3ng trong nhi\u1ec1u ng\u00e0nh c\u00f4ng nghi\u1ec7p c\u00f3 y\u00eau c\u1ea7u cao. Khi t\u00ecm ki\u1ebfm \u201cPTP cho t\u1ef1 \u0111\u1ed9ng h\u00f3a c\u00f4ng nghi\u1ec7p\u201d<\/strong> or \u201cy\u00eau c\u1ea7u g\u1eafn d\u1ea5u th\u1eddi gian trong giao d\u1ecbch t\u00e0i ch\u00ednh\u201d,\u201d<\/strong> b\u1ea1n s\u1ebd th\u1ea5y PTP n\u1eb1m \u1edf trung t\u00e2m c\u1ee7a gi\u1ea3i ph\u00e1p.<\/p>\n\n\n\n