{"id":518,"date":"2026-09-23T02:04:35","date_gmt":"2026-09-23T02:04:35","guid":{"rendered":"https:\/\/kinghl.cloud\/?p=518"},"modified":"2026-09-23T02:04:35","modified_gmt":"2026-09-23T02:04:35","slug":"10-dieu-co-the-ban-chua-biet-ve-poe","status":"publish","type":"post","link":"https:\/\/kinghl.cloud\/?p=518","title":{"rendered":"10 \u0111i\u1ec1u c\u00f3 th\u1ec3 b\u1ea1n ch\u01b0a bi\u1ebft v\u1ec1 POE"},"content":{"rendered":"

1. POE l\u00e0 g\u00ec ?<\/h1>\n

PoE hay power over ethernet l\u00e0 c\u00f4ng ngh\u1ec7 cho ph\u00e9p c\u1ea5p ngu\u1ed3n th\u00f4ng qua d\u00e2y m\u1ea1ng<\/p>\n

L\u00fac tr\u01b0\u1edbc, khi l\u1eafp m\u1ed9t camera, c\u00e1c b\u1ea1n ph\u1ea3i \u0111i 2 d\u00e2y, m\u1ed9t d\u00e2y ngu\u1ed3n \u0111\u1ec3 c\u1ea5p \u0111i\u1ec7n cho camera ho\u1ea1t \u0111\u1ed9ng. M\u1ed9t d\u00e2y m\u1ea1ng \u0111\u1ec3 camera c\u00f3 truy\u1ec1n t\u00edn hi\u1ec7u.<\/p>\n

Tuy nhi\u00ean, n\u1ebfu camera h\u1ed7 tr\u1ee3 POE, c\u00e1c b\u1ea1n ch\u1ec9 c\u1ea7n k\u00e9o m\u1ed9t s\u1ee3i c\u00e1p m\u1ea1ng cho camera l\u00e0 \u0111\u1ee7. C\u00e1p n\u00e0y v\u1eeba c\u1ea5p ngu\u1ed3n cho camera, v\u1eeba gi\u00fap camera truy\u1ec1n d\u1eef li\u1ec7u.<\/p>\n

\"\"2. T\u1ea1i sao l\u1ea1i s\u1eed d\u1ee5ng POE ?<\/h1>\n

Ti\u1ebft ki\u1ec7m th\u1eddi gian v\u00e0 chi ph\u00ed<\/b> : b\u1eb1ng c\u00e1ch gi\u1ea3m th\u1eddi gian v\u00e0 chi ph\u00ed l\u1eafp \u0111\u1eb7t h\u1ec7 th\u1ed1ng c\u00e1p \u0111i\u1ec7n. POE kh\u00f4ng c\u1ea7n th\u1ee3 \u0111i\u1ec7n c\u00f3 chuy\u00ean m\u00f4n \u0111\u1ec3 l\u1eafp v\u00e0 c\u00f3 th\u1ec3 \u0111\u1eb7t \u1edf b\u1ea5t c\u1ee9 \u0111\u00e2u.<\/p>\n

T\u00ednh linh ho\u1ea1t<\/b> : kh\u00f4ng b\u1ecb ph\u1ee5 thu\u1ed9c v\u00e0o \u1ed5 c\u1eafm \u0111i\u1ec7n, c\u00e1c thi\u1ebft b\u1ecb nh\u01b0 camera IP v\u00e0 AP c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c \u0111\u1eb7t \u1edf b\u1ea5t c\u1ee9 n\u01a1i n\u00e0o c\u1ea7n thi\u1ebft v\u00e0 th\u00e1o l\u1eafp l\u1ea1i l\u1ea1i d\u1ec5 d\u00e0ng n\u1ebfu c\u1ea7n.<\/p>\n

An to\u00e0n<\/b> : POE th\u00f4ng minh h\u01a1n v\u00e0 \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 b\u1ea3o v\u1ec7 thi\u1ebft b\u1ecb m\u1ea1ng kh\u1ecfi t\u00ecnh tr\u1ea1ng qu\u00e1 t\u1ea3i, thi\u1ebfu c\u00f4ng su\u1ea5t ho\u1eb7c l\u1eafp \u0111\u1eb7t sai.<\/p>\n

\u0110\u1ed9 tin c\u1eady<\/b> : Ngu\u1ed3n POE \u0111\u1ebfn t\u1eeb m\u1ed9t ngu\u1ed3n trung t\u00e2m v\u00e0 t\u01b0\u01a1ng th\u00edch to\u00e0n c\u1ea7u, thay v\u00ec ph\u1ea3i d\u00f9ng m\u1ed9t lo\u1ea1t c\u00e1c b\u1ed9 ngu\u1ed3n adapter r\u1eddi. Do \u0111\u00f3 POE c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c l\u01b0u b\u1eb1ng UPS ho\u1eb7c \u0111\u01b0\u1ee3c \u0111i\u1ec1u khi\u1ec3n \u0111\u1ec3 d\u1ec5 d\u00e0ng b\u1eadt\/t\u1eaft c\u00e1c thi\u1ebft b\u1ecb. N\u1ebfu t\u1eaft camera, ch\u1ec9 c\u1ea7n t\u1eaft port tr\u00ean switch poe l\u00e0 xong.<\/p>\n

Kh\u1ea3 n\u0103ng m\u1edf r\u1ed9ng <\/b>: c\u00f3 s\u1eb5n ngu\u1ed3n \u0111i\u1ec7n tr\u00ean m\u1ea1ng c\u00f3 ngh\u0129a l\u00e0 vi\u1ec7c c\u00e0i \u0111\u1eb7t v\u00e0 ph\u00e2n ph\u1ed1i c\u00e1c k\u1ebft n\u1ed1i m\u1ea1ng tr\u1edf n\u00ean \u0111\u01a1n gi\u1ea3n v\u00e0 hi\u1ec7u qu\u1ea3<\/p>\n

3. \u0110\u1ec3 d\u00f9ng POE th\u00ec c\u1ea7n g\u00ec ?<\/h1>\n

\u0110\u1ea7u ti\u00ean l\u00e0 thi\u1ebft b\u1ecb ph\u1ea3i h\u1ed7 tr\u1ee3 ngu\u1ed3n POE tr\u01b0\u1edbc \u0111\u00e3. Thi\u1ebft b\u1ecb n\u00e0y \u0111uo\u1ee3c g\u1ecdi l\u00e0 PD : powered device. Ba lo\u1ea1i ph\u1ed5 bi\u1ebfn c\u00f3 th\u1ec3 h\u1ed7 tr\u1ee3 POE \u0111\u00f3 l\u00e0 : access point wifi, camera v\u00e0 ip phone.<\/p>\n

Th\u1ee9 hai l\u00e0 ngu\u1ed3n poe: PSE – power source equipment Ngu\u1ed3n poe c\u00f3 th\u1ec3 l\u00e0 switch poe ho\u1eb7c poe injector.<\/p>\n

V\u1edbi switch poe, th\u01b0\u1eddng d\u00f9ng trong c\u00e1c tr\u01b0\u1eddng h\u1ee3p c\u00f3 nhi\u1ec1u PD, l\u00fac n\u00e0y \u0111\u01a1n gi\u1ea3n ch\u1ec9 c\u1ea7n d\u00f9ng c\u00e1p m\u1ea1ng \u0111\u1ec3 k\u1ebft n\u1ed1i PD v\u1edbi port switch l\u00e0 xong. C\u00e1ch n\u00e0y \u0111\u01a1n gi\u1ea3n, kh\u1ea3 n\u0103ng ki\u1ec3m so\u00e1t c\u0169ng cao. C\u00e1c b\u1ea1n c\u00f3 th\u1ec3 theo d\u00f5i tr\u1ea1ng th\u00e1i poe, bi\u1ebft \u0111\u01b0\u1ee3c c\u00e1c thi\u1ebft b\u1ecb \u0111\u00e3 d\u00f9ng bao nhi\u00eau c\u00f4ng su\u1ea5t, c\u00f3 b\u1ecb qu\u00e1 t\u1ea3i hay kh\u00f4ng, v\u00e0 c\u0169ng c\u00f3 th\u1ec3 b\u1eadt\/t\u1eaft PD b\u1eb1ng c\u00e1ch b\u1eadt\/ t\u1eaft port tr\u00ean switch.<\/p>\n

Poe Injector th\u01b0\u1eddng d\u00f9ng trong tr\u01b0\u1eddng h\u1ee3p \u00edt PD \u0111\u1ec3 ti\u1ebft ki\u1ec7m chi ph\u00ed. B\u1ed9 POE inject c\u00f3 m\u1ed9t ch\u1ed7 c\u1eafm ngu\u1ed3n, v\u00e0 2 port LAN. B\u1ea1n c\u1ea5p ngu\u1ed3n cho POE injector th\u00f4ng qua ngu\u1ed3n \u0111i\u1ec7n AC th\u00f4ng th\u01b0\u1eddng. 2 port LAN th\u00ec m\u1ed9t port c\u1eafm v\u00e0o PD , m\u1ed9t port c\u1eafm v\u1ec1 switch.<\/p>\n

4. POE c\u00f3 t\u01b0\u01a1ng th\u00edch gi\u1eefa c\u00e1c h\u00e3ng kh\u00e1c nhau kh\u00f4ng ?<\/h1>\n

\u0110\u00fang l\u00e0 th\u1eddi k\u1ef3 \u0111\u1ea7u c\u1ee7a POE, nhi\u1ec1u h\u00e3ng s\u1ea3n xu\u1ea5t \u0111\u1ed9c quy\u1ec1n. Tuy nhi\u00ean, ti\u00eau chu\u1ea9n IEEE 802.3af \u0111\u00e3 \u0111\u01b0\u1ee3c ph\u1ed5 bi\u1ebfn r\u1ed9ng r\u00e3i khi s\u1ef1 ph\u1ed5 bi\u1ebfn c\u1ee7a POE ng\u00e0y c\u00e0ng lan r\u1ed9ng, c\u00f3 ngh\u0129a l\u00e0 kh\u1ea3 n\u0103ng t\u01b0\u01a1ng th\u00edch gi\u1eefa t\u1ea5t c\u1ea3 c\u00e1c thi\u1ebft b\u1ecb POE hi\u1ec7n \u0111\u1ea1i \u0111\u01b0\u1ee3c \u0111\u1ea3m b\u1ea3o.<\/p>\n

5. POE y\u00eau c\u1ea7u h\u1ec7 th\u1ed1ng d\u00e2y \u0111i\u1ec7n \u0111\u1eb7c bi\u1ec7t hay kh\u00f4ng ?<\/h1>\n

Kh\u00f4ng h\u1ec1, c\u00f9ng m\u1ed9t lo\u1ea1i c\u00e1p – Cat 5e, Cat 6, v.v. – v\u00e0 \u0111\u1ea7u n\u1ed1i ki\u1ec3u “RJ45” \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng chung cho c\u1ea3 m\u1ea1ng th\u00f4ng th\u01b0\u1eddng v\u00e0 m\u1ea1ng h\u1ed7 tr\u1ee3 PoE<\/p>\n

6. C\u1eafm laptop v\u00e0o port POE th\u00ec c\u00f3 sao kh\u00f4ng ?<\/h1>\n

Quan ni\u1ec7m sai l\u1ea7m n\u00e0y ph\u1ed5 bi\u1ebfn m\u1ed9t c\u00e1ch \u0111\u00e1ng ng\u1ea1c nhi\u00ean. Trong pha \u0111\u1ea7u ti\u00ean khi c\u1eafm thi\u1ebft b\u1ecb v\u00e0o, c\u00e1c thi\u1ebft b\u1ecb s\u1ebd t\u1ef1 \u0111\u1ed9ng ph\u00e1t hi\u1ec7n n\u0103ng l\u1ef1c POE (c\u00f3 h\u1ed7 tr\u1ee3 poe kh\u00f4ng, poe chu\u1ea9n g\u00ec) d\u1ef1a tr\u00ean \u0111i\u1ec7n tr\u1edf. Do \u0111\u00f3 c\u1eafm laptop hay PC v\u00e0o port POE s\u1ebd kh\u00f4ng c\u00f3 v\u1ea5n \u0111\u1ec1 g\u00ec c\u1ea3.<\/p>\n

7. C\u00e1c ti\u00eau chu\u1ea9n POE ?<\/h1>\n

C\u00f3 4 chu\u1ea9n :<\/p>\n

    \n
  • 802.3 af (POE): PSE cung c\u1ea5p t\u1ed1i \u0111a 15.4W, c\u00f4ng su\u1ea5t t\u1ed1i \u0111a t\u1ea1i PD l\u00e0 12.95W<\/li>\n
  • 802.3 at (POE+) : PSE cung c\u1ea5p t\u1ed1i \u0111a 30W, c\u00f4ng su\u1ea5t t\u1ed1i \u0111a t\u1ea1i PD l\u00e0 25.5W<\/li>\n
  • 802.3 bt type 1 (HPOE): PSE cung c\u1ea5p t\u1ed1i \u0111a 60W, c\u00f4ng su\u1ea5t t\u1ed1i \u0111a t\u1ea1i PD l\u00e0 51W<\/li>\n
  • 802.3 bt type 2 : PSE cung c\u1ea5p t\u1ed1i \u0111a 100W, c\u00f4ng su\u1ea5t t\u1ed1i \u0111a t\u1ea1i PD l\u00e0 71W<\/li>\n<\/ul>\n

    Chu\u1ea9n poe cao h\u01a1n th\u00ec t\u01b0\u01a1ng th\u00edch ng\u01b0\u1ee3c v\u1edbi c\u00e1c chu\u1ea9n poe tr\u01b0\u1edbc. v\u00ed d\u1ee5 AP 802.3 af v\u1eabn c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c c\u1eafm v\u00e0o PSE 802.3at.<\/p>\n

    8. Ch\u1ecdn thi\u1ebft b\u1ecb POE ?<\/h1>\n

    \u0110\u1ea7u ti\u00ean ph\u1ea3i xem PD c\u1ee7a b\u1ea1n h\u1ed7 tr\u1ee3 POE kh\u00f4ng, chu\u1ea9n poe g\u00ec v\u00e0 c\u00f4ng su\u1ea5t ti\u00eau th\u1ee5 c\u1ee7a PD l\u00e0 bao nhi\u00eau. Th\u00f4ng th\u01b0\u1eddng camera, AP v\u00e0 IP phone h\u1ed7 tr\u1ee3 POE 802.3af, c\u00f4ng su\u1ea5t ti\u00eau th\u1ee5 th\u01b0\u1eddng r\u1ea5t th\u1ea5p. Access Point Wi-Fi 6, access point m\u1eadt \u0111\u1ed9 cao s\u1ebd c\u1ea7n nhi\u1ec1u ngu\u1ed3n h\u01a1n, ph\u1ea3i d\u00f9ng \u0111\u1ebfn 802.3at. Camera PTZ, camera th\u00e2n nhi\u1ec7t… s\u1ebd c\u1ea7n HPOE 802.3bt.Nh\u01b0ng ch\u1eafc \u0103n th\u00ec c\u1ee9 ph\u1ea3i \u0111\u1ecdc datasheet thi\u1ebft b\u1ecb.<\/p>\n

    Ti\u1ebfp theo l\u00e0 ch\u1ecdn PSE. PSE ph\u1ea3i c\u00f3 chu\u1ea9n b\u1eb1ng ho\u1eb7c cao h\u01a1n PD. V\u00ed d\u1ee5 AP c\u1ea7n POE+ th\u00ec switch c\u0169ng ph\u1ea3i h\u1ed7 tr\u1ee3 POE+. N\u1ebfu c\u1ea5p thi\u1ebfu ngu\u1ed3n, c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn thi\u1ebft b\u1ecb kh\u00f4ng kh\u1edfi \u0111\u1ed9ng \u0111\u01b0\u1ee3c, ho\u1eb7c ch\u1ea1y kh\u00f4ng h\u1ebft c\u00f4ng su\u1ea5t. V\u00ed d\u1ee5 anten 4×4 c\u00f3 th\u1ec3 chuy\u1ec3n xu\u1ed1ng c\u00f2n 2×2. Ngo\u00e0i ra, t\u1ed5ng c\u00f4ng su\u1ea5t POE (POE budget) c\u1ee7a switch poe ph\u1ea3i l\u1edbn h\u01a1n t\u1ed5ng c\u00f4ng su\u1ea5t m\u00e0 c\u00e1c PD k\u1ebft n\u1ed1i v\u00e0o n\u00f3 th\u1ee5. N\u1ebfu c\u1ea5p thi\u1ebfu, switch s\u1ebd b\u1ecb qu\u00e1 t\u1ea3i poe v\u00e0 li\u00ean t\u1ee5c reset.<\/p>\n

    \"\"<\/p>\n

    9. POE ch\u1ea1y tr\u00ean m\u1ea5y l\u00f5i ?<\/h1>\n

    POE c\u00f3 hai mode : mode A v\u00e0 mode B<\/p>\n

    POE mode A truy\u1ec1n t\u00edn hi\u1ec7u v\u00e0 \u0111i\u1ec7n tr\u00ean c\u00f9ng l\u00f5i. Do \u0111\u00f3, ch\u1ec9 c\u1ea7n d\u00f9ng 4 l\u00f5i.<\/p>\n

    POE mode B t\u00e1ch bi\u1ec7t vi\u1ec7c truy\u1ec1n t\u00edn hi\u1ec7u v\u00e0 \u0111i\u1ec7n. truy\u1ec1n t\u00edn hi\u1ec7u tr\u00ean 4 l\u00f5i v\u00e0 truy\u1ec1n \u0111i\u1ec7n tr\u00ean 4 l\u00f5i c\u00f2n l\u1ea1i. Do \u0111\u00f3, c\u1ea7n \u0111\u1ee7 8 l\u00f5i.<\/p>\n

    Vi\u1ec7c d\u00f9ng mode A hay mode B, 4 l\u00f5i hay 8 l\u00f5i \u0111\u01b0\u1ee3c quy\u1ebft \u0111\u1ecbnh b\u1edfi PSE (t\u1ee9c l\u00e0 switch poe v\u00e0 poe injector). N\u1ebfu PD kh\u00f4ng h\u1ed7 tr\u1ee3 1 trong 2 mode th\u00ec \u0111\u01b0\u1ee3c xem nh\u01b0 l\u00e0 kh\u00f4ng \u0111\u1ee7 ti\u00eau chu\u1ea9n.<\/p>\n

    Hay n\u00f3i ng\u01b0\u1ee3c l\u1ea1i. \u0110\u00e3 \u0111\u1ea3m b\u1ea3o chu\u1ea9n poe 802.3af tr\u1edf l\u00ean th\u00ec kh\u00f4ng c\u1ea7n qu\u00e1 quan t\u00e2m chuy\u1ec7n 4 l\u00f5i hay 8 l\u00f5i<\/p>\n

    10. POE c\u1ea5p ngu\u1ed3n bao nhi\u00eau Volt ?<\/h1>\n

    Khi d\u00f9ng \u0111\u00fang chu\u1ea9n POE, PSE v\u00e0 PD s\u1ebd t\u1ef1 th\u1ecfa thu\u1eadn \u0111i\u1ec7n \u00e1p v\u00e0 c\u00f4ng su\u1ea5t ti\u00eau th\u1ee5. Ch\u00fang ta kh\u00f4ng c\u1ea7n ph\u1ea3i quan t\u00e2m v\u1ec1 v\u1ea5n \u0111\u1ec1 n\u00e0y.<\/p>\n

    Tr\u01b0\u1edbc \u0111\u00e2y c\u00f3 v\u00e0i thi\u1ebft b\u1ecb ch\u1ea1y passive poe, d\u00f9ng m\u1ee9c \u0111i\u1ec7n \u00e1p c\u1ed1 \u0111\u1ecbnh 24V ho\u1eb7c 48V, v\u00ed d\u1ee5 nh\u01b0 Unifi ch\u1eb3ng h\u1ea1n, \u0111\u00e2y kh\u00f4ng ph\u1ea3i l\u00e0 poe ti\u00eau chu\u1ea9n 802.3af. L\u00fac n\u00e0y c\u1ea7n quan t\u00e2m poe bao nhi\u00eau volt. c\u00f2n \u0111\u00e3 chu\u1ea9n r\u1ed3i, th\u00ec c\u1ee9 c\u1eafm v\u00e0 ch\u1ea1y.<\/p>\n

    – H\u1ebft –<\/p>\n","protected":false},"excerpt":{"rendered":"

    1. POE l\u00e0 g\u00ec ? PoE hay power over ethernet l\u00e0 c\u00f4ng ngh\u1ec7 cho ph\u00e9p c\u1ea5p ngu\u1ed3n th\u00f4ng qua d\u00e2y m\u1ea1ng L\u00fac tr\u01b0\u1edbc, khi l\u1eafp m\u1ed9t camera, c\u00e1c b\u1ea1n ph\u1ea3i \u0111i 2 d\u00e2y, m\u1ed9t d\u00e2y ngu\u1ed3n \u0111\u1ec3 c\u1ea5p \u0111i\u1ec7n cho camera ho\u1ea1t \u0111\u1ed9ng. M\u1ed9t d\u00e2y m\u1ea1ng \u0111\u1ec3 camera c\u00f3 truy\u1ec1n t\u00edn hi\u1ec7u. Tuy nhi\u00ean, n\u1ebfu […]<\/p>\n","protected":false},"author":1,"featured_media":519,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[34],"tags":[],"class_list":["post-518","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cctv"],"acf":[],"_links":{"self":[{"href":"https:\/\/kinghl.cloud\/index.php?rest_route=\/wp\/v2\/posts\/518","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kinghl.cloud\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kinghl.cloud\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kinghl.cloud\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/kinghl.cloud\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=518"}],"version-history":[{"count":1,"href":"https:\/\/kinghl.cloud\/index.php?rest_route=\/wp\/v2\/posts\/518\/revisions"}],"predecessor-version":[{"id":520,"href":"https:\/\/kinghl.cloud\/index.php?rest_route=\/wp\/v2\/posts\/518\/revisions\/520"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/kinghl.cloud\/index.php?rest_route=\/wp\/v2\/media\/519"}],"wp:attachment":[{"href":"https:\/\/kinghl.cloud\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=518"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kinghl.cloud\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=518"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kinghl.cloud\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=518"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}