{"id":3958,"date":"2020-03-30T13:59:20","date_gmt":"2020-03-30T06:59:20","guid":{"rendered":"https:\/\/pronetsolutionsvn.com\/?p=3958"},"modified":"2025-04-03T12:53:40","modified_gmt":"2025-04-03T05:53:40","slug":"cap-nguon-qua-ethernet-poe-la-gi","status":"publish","type":"post","link":"https:\/\/pronetsolutionsvn.com\/?p=3958","title":{"rendered":"C\u1ea5p ngu\u1ed3n qua Ethernet (PoE) l\u00e0 g\u00ec?"},"content":{"rendered":"\n

Nhu c\u1ea7u l\u1eafp \u0111\u1eb7t h\u1ec7 th\u1ed1ng camera an ninh gi\u00e1m s\u00e1t cho nh\u00e0 x\u01b0\u1edfng, x\u00ed nghi\u1ec7p ng\u00e0y c\u00e0ng tr\u1edf n\u00ean ph\u1ed5 bi\u1ebfn. Tuy nhi\u00ean, \u0111\u1ec3 l\u1eafp \u0111\u1eb7t \u0111\u01b0\u1ee3c h\u1ec7 th\u1ed1ng camera ho\u00e0n ch\u1ec9nh ph\u1ea3i c\u1ea7n r\u1ea5t nhi\u1ec1u th\u1eddi gian, c\u00f4ng s\u1ee9c v\u00e0 chi ph\u00ed mua c\u00e1c thi\u1ebft b\u1ecb nh\u01b0 d\u00e2y k\u00e9o, \u1ed5 c\u1eafm \u0111i\u1ec7n. Nh\u01b0 v\u1eady s\u1ebd d\u1eabn \u0111\u1ebfn nh\u1eefng v\u1ea5n \u0111\u1ec1 b\u1ea5t l\u1ee3i. Ch\u00ednh v\u00ec v\u1eady m\u00e0 c\u00f4ng ngh\u1ec7 PoE \u0111\u00e3 \u0111\u01b0\u1ee3c ra \u0111\u1eddi nh\u1eb1m gi\u00fap vi\u1ec7c l\u1eafp \u0111\u1eb7t v\u00e0 s\u1eed d\u1ee5ng h\u1ec7 th\u1ed1ng camera \u0111\u01b0\u1ee3c \u0111\u01a1n gi\u1ea3n v\u00e0 d\u1ec5 d\u00e0ng h\u01a1n. V\u1eady c\u00f4ng ngh\u1ec7 ngu\u1ed3n PoE l\u00e0 g\u00ec?<\/strong><\/span><\/p>\n

C\u00f4ng ngh\u1ec7 c\u1ea5p ngu\u1ed3n PoE l\u00e0 g\u00ec?<\/strong><\/span><\/h1>\n

PoE hay c\u00f2n \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 c\u00f4ng ngh\u1ec7 c\u1ea5p ngu\u1ed3n PoE, l\u00e0 vi\u1ebft t\u1eaft c\u1ee7a t\u1eeb Power over Ethernet<\/strong><\/span>. C\u00f4ng ngh\u1ec7 n\u00e0y c\u00f3 t\u00ednh n\u0103ng truy\u1ec1n t\u1ea3i \u0111i\u1ec7n cho c\u00e1c thi\u1ebft b\u1ecb th\u00f4ng qua cable RJ45.<\/p>\n

C\u00f4ng ngh\u1ec7 c\u1ea5p ngu\u1ed3n PoE gi\u00fap ch\u1ea5t l\u01b0\u1ee3ng t\u00edn hi\u1ec7u ng\u00e0y v\u00e0 \u0111\u00eam lu\u00f4n \u0111\u01b0\u1ee3c \u1ed5n \u0111\u1ecbnh. Ngu\u1ed3n PoE \u0111\u01b0\u1ee3c c\u00e0i \u0111\u1eb7t trong l\u00f5i c\u00e1p UTP. Ngh\u0129a l\u00e0 trong c\u00e1p UTP th\u01b0\u1eddng c\u00f3 8 l\u00f5i. Tuy nhi\u00ean, ch\u1ec9 c\u00f3 4 l\u00f5i th\u1ef1c hi\u1ec7n nhi\u1ec7m v\u1ee5 truy\u1ec1n v\u00e0 nh\u1eadn th\u00f4ng tin, 4 l\u00f5i c\u00f2n l\u1ea1i s\u1eed d\u1ee5ng cho m\u1ee5c \u0111\u00edch c\u1ea5p ngu\u1ed3n PoE ho\u1eb7c nhi\u1ec1u m\u1ee5c \u0111\u00edch kh\u00e1c nhau.<\/p>\n

\"\"\/<\/p>\n

T\u1ea1i sao s\u1eed d\u1ee5ng PoE?<\/span><\/strong><\/h1>\n

Ngu\u1ed3n PoE gi\u00fap ti\u1ebft ki\u1ec7m th\u1eddi gian v\u00e0 chi ph\u00ed. B\u1edfi th\u1eddi gian PoE c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c l\u1eafp \u0111\u1eb7t \u1edf b\u1ea5t c\u1ee9 \u0111\u00e2u m\u1ed9t c\u00e1ch d\u1ec5 d\u00e0ng v\u00e0 thu\u1eadn ti\u1ec7n.<\/p>\n

L\u00fd do th\u1ee9 hai b\u1ea1n n\u00ean s\u1eed d\u1ee5ng PoE \u0111\u00f3 l\u00e0 t\u00ednh linh ho\u1ea1t. Thi\u1ebft b\u1ecb c\u00f3 th\u1ec3 l\u1eafp \u0111\u1eb7t \u1edf b\u1ea5t k\u1ef3 \u0111\u00e2u m\u00e0 kh\u00f4ng b\u1ecb bu\u1ed9c v\u00e0o \u1ed5 c\u1eafm \u0111i\u1ec7n. Nh\u01b0 v\u1eady s\u1ebd gi\u00fap c\u00e1c thi\u1ebft b\u1ecb nh\u01b0 \u0111i\u1ec3m truy c\u1eadp kh\u00f4ng d\u00e2y ho\u1eb7c camera IP \u0111\u01b0\u1ee3c \u0111\u1eb7t \u1edf b\u1ea5t k\u1ef3 \u0111\u1ea7u, gi\u00fap cho vi\u1ec7c \u0111\u1ecbnh v\u1ecb \u0111\u01b0\u1ee3c tr\u1edf n\u00ean d\u1ec5 d\u00e0ng h\u01a1n.<\/p>\n

L\u00fd do ti\u1ebfp theo m\u00e0 b\u1ea1n s\u1eed d\u1ee5ng ngu\u1ed3n PoE \u0111\u00f3 l\u00e0 \u0111\u1ea3m b\u1ea3o an to\u00e0n khi s\u1eed d\u1ee5ng. \u0110\u1ea3m b\u1ea3o an to\u00e0n \u1edf \u0111\u00e2y kh\u00f4ng ch\u1ec9 l\u00e0 \u0111\u1ea3m b\u1ea3o an to\u00e0n cho ng\u01b0\u1eddi s\u1eed d\u1ee5ng m\u00e0 c\u00f2n \u0111\u1ea3m b\u1ea3o cho h\u1ec7 th\u1ed1ng m\u1ea1ng. Ngh\u0129a l\u00e0 n\u1ebfu trong qu\u00e1 tr\u00ecnh s\u1eed d\u1ee5ng n\u1ebfu x\u1ea3y ra t\u00ecnh tr\u1ea1ng qu\u00e1 t\u1ea3i, c\u00e0i \u0111\u1eb7t kh\u00f4ng ch\u00ednh x\u00e1c th\u00ec nh\u1eefng thi\u1ebft b\u1ecb m\u1ea1ng s\u1ebd \u0111\u01b0\u1ee3c b\u1ea3o v\u1ec7 b\u1edfi ngu\u1ed3n PoE.<\/p>\n

Nh\u1edd ngu\u1ed3n PoE m\u00e0 nh\u1eefng c\u00e1c k\u1ebft n\u1ed1i m\u1ea1ng \u0111\u01b0\u1ee3c c\u00e0i \u0111\u1eb7t v\u00e0 ph\u00e2n ph\u1ed1i tr\u1edf n\u00ean \u0111\u01a1n gi\u1ea3n v\u00e0 hi\u1ec7u qu\u1ea3 h\u01a1n. H\u01a1n n\u1eefa c\u00f4ng ngh\u1ec7 n\u00e0y c\u00f2n gi\u00fap ki\u1ec3m so\u00e1t c\u00e1c thi\u1ebft b\u1ecb d\u1ec5 d\u00e0ng h\u01a1n.<\/p>\n

C\u00e1c thi\u1ebft b\u1ecb s\u1eed d\u1ee5ng Power over Ethernet<\/span><\/h2>\n

Hi\u1ec7n nay c\u00f3 r\u1ea5t nhi\u1ec1u thi\u1ebft b\u1ecb s\u1eed d\u1ee5ng c\u00f4ng ngh\u1ec7 ngu\u1ed3n PoE. Tuy nhi\u00ean c\u00f3 3 thi\u1ebft b\u1ecb s\u1eed d\u1ee5ng ch\u00ednh \u0111\u00f3 l\u00e0 VoIP Phone, Camera IP, Wireless.<\/p>\n

VoIP Phone<\/strong><\/span>: \u0110\u00e2y l\u00e0 m\u1ed9t trong nh\u1eefng \u1ee9ng d\u1ee5ng s\u1eed d\u1ee5ng c\u00f4ng ngh\u1ec7 PoE \u0111\u1ea7u ti\u00ean. Khi s\u1eed d\u1ee5ng c\u00f4ng ngh\u1ec7 n\u00e0y cho \u0111i\u1ec7n tho\u1ea1i ngh\u0129a l\u00e0 \u0111i\u1ec7n tho\u1ea1i ch\u1ec9 c\u00f3 m\u1ed9t k\u1ebft n\u1ed1i duy nh\u1ea5t \u0111\u01b0\u1ee3c c\u1eafm v\u1edbi \u1ed5 \u0111i\u1ec7n tr\u00ean t\u01b0\u1eddng. Ngo\u00e0i ra, c\u00f2n c\u00f3 kh\u1ea3 n\u0103ng \u0111i\u1ec1u khi\u1ec3n t\u1eeb xa.<\/p>\n

Camera IP<\/strong><\/span>: Hi\u1ec7n nay, t\u1ea5t c\u1ea3 c\u00e1c lo\u1ea1i camera gi\u00e1m s\u00e1t m\u1ea1ng \u0111\u1ec1u \u0111\u01b0\u1ee3c c\u00e0i \u0111\u1eb7t \u1ee9ng d\u1ee5ng n\u00e0y. M\u1ee5c \u0111\u00edch l\u00e0 \u0111\u1ec3 d\u1ec5 d\u00e0ng quan s\u00e1t v\u00e0 \u0111\u1ecbnh v\u1ecb l\u1ea1i.<\/p>\n

Wireless<\/span><\/strong>: S\u1eed d\u1ee5ng PoE cho wireless gi\u00fap v\u1ecb tr\u00ed c\u00e1ch xa c\u00e1c \u0111i\u1ec3m c\u1eafm ngu\u1ed3n AC v\u00e0 di chuy\u1ec3n sau c\u00e1c cu\u1ed9c kh\u1ea3o s\u00e1t \u0111\u1ecba \u0111i\u1ec3m.<\/p>\n

\"\"\/<\/p>\n

Thi\u1ebft b\u1ecb PoE ho\u1ea1t \u0111\u1ed9ng nh\u01b0 th\u1ebf n\u00e0o?<\/strong><\/span><\/h2>\n

Thi\u1ebft b\u1ecb PoE ho\u1ea1t \u0111\u1ed9ng theo t\u1eebng v\u1ecb tr\u00ed nh\u1ea5t \u0111\u1ecbnh. V\u00ed d\u1ee5 nh\u01b0 PDs, PSE, Midspan device, PoE Switches.<\/p>\n

– PDs: \u0111\u00e2y l\u00e0 thi\u1ebft b\u1ecb cu\u1ed1i c\u00f3 kh\u1ea3 n\u0103ng ch\u1ea5p nh\u1eadn t\u00edn hi\u1ec7u t\u1eeb Ethernet Cat-5 Cable.<\/p>\n

– PSE: gi\u00fap t\u0103ng c\u01b0\u1eddng ngu\u1ed3n PoE tr\u00ean cable m\u1ea1ng.<\/p>\n

– Midspan device: gi\u00fap c\u00e1c thi\u1ebft b\u1ecb \u0111\u1ea7u cu\u1ed1i c\u00f9ng nh\u01b0 thi\u1ebft b\u1ecb Switch \u0111\u01b0\u1ee3c \u0111\u1ed3ng b\u1ed9 v\u1edbi nhau.<\/p>\n

– Endspan device: \u0110\u00e2y ch\u00ednh l\u00e0 b\u1ed9 chuy\u1ec3n m\u1ea1ch bao g\u1ed3m 4 c\u1eb7p c\u00e1p xo\u1eafn l\u00e0 2 c\u1eb7p \u0111\u1ec3 data transfer, 2 c\u1eb7p \u0111\u1ec3 tr\u1ed1ng.<\/p>\n

\"\"\/<\/p>\n

\u01afu \u0111i\u1ec3m c\u1ee7a ngu\u1ed3n PoE<\/span><\/h2>\n

\u01afu \u0111i\u1ec3m \u0111\u1ea7u ti\u00ean \u0111\u00f3 l\u00e0 \u0111\u01a1n gi\u1ea3n h\u00f3a qu\u00e1 tr\u00ecnh thi c\u00f4ng m\u1ea1ng. Ngh\u0129a l\u00e0 t\u1ea5t c\u1ea3 m\u1ecdi vi\u1ec7c nh\u01b0 \u0111i d\u00e2y \u0111i\u1ec7n ngu\u1ed3n 220V \u0111\u1ebfn t\u1eebng thi\u1ebft b\u1ecb kh\u00e1c nhau \u0111\u1ec3 cung c\u1ea5p ngu\u1ed3n cho ch\u00fang \u0111\u1ec1u \u0111\u01b0\u1ee3c c\u00f4ng ngh\u1ec7 ngu\u1ed3n PoE gi\u1ea3i quy\u1ebft.<\/p>\n

\u0110\u1eb7c bi\u1ec7t, khi s\u1eed d\u1ee5ng ngu\u1ed3n PoE th\u00ec t\u1ea5t c\u1ea3 nh\u1eefng ngu\u1ed3n \u0111i\u1ec7n \u0111\u01b0\u1ee3c qu\u1ea3n l\u00fd t\u1eadp trung. Nh\u01b0 v\u1eady s\u1ebd tr\u00e1nh xa \u0111\u01b0\u1ee3c vi\u1ec7c \u0111i d\u00e2y \u0111i\u1ec7n r\u1ed1i r\u1eafm, thi\u1ebfu \u1ed5n \u0111\u1ecbnh. T\u1eeb \u0111\u00f3 ti\u1ebft ki\u1ec7m \u0111\u01b0\u1ee3c th\u1eddi gian, c\u00f4ng s\u1ee9c v\u00e0 chi ph\u00ed thi c\u00f4ng.<\/p>\n

B\u00ean c\u1ea1nh nh\u1eefng \u01b0u \u0111i\u1ec3m khi gi\u1ea3i ph\u00e1p ngu\u1ed3n PoE n\u00e0y ch\u00ednh l\u00e0 ph\u1ea1m vi ch\u1ea1y d\u00e2y m\u1ea1ng b\u1ecb gi\u1edbi h\u1ea1n. Ngh\u0129a l\u00e0 n\u1ebfu v\u01b0\u1ee3t qua trong kho\u1ea3ng 100 m\u00e9t th\u00ec s\u1ebd kh\u00f4ng th\u1ec3 cung c\u1ea5p \u0111\u1ee7 ngu\u1ed3n cho nh\u1eefng thi\u1ebft b\u1ecb kh\u00e1c ho\u1ea1t \u0111\u1ed9ng.<\/p>\n

C\u00e1c chu\u1ea9n PoE<\/strong><\/span><\/h2>\n

\"\"\/<\/p>\n

Chu\u1ea9n IEEE 802.3bt PoE<\/strong><\/span><\/h3>\n

Chu\u1ea9n n\u00e0y hay c\u00f2n \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 chu\u1ea9n t\u01b0\u01a1ng th\u00edch ng\u01b0\u1ee3c v\u1edbi chu\u1ea9n af v\u00e0 at, gi\u00fap h\u1ed7 tr\u1ee3 \u1ee9ng d\u1ee5ng 10Gbase – T \u0111\u01b0\u1ee3c ho\u1ea1t \u0111\u1ed9ng t\u1ed1t nh\u1ea5t. Chu\u1ea9n IEEE 802.3bt PoE cung c\u1ea5p t\u1ed1i thi\u1ec3u m\u1ee9c c\u00f4ng su\u1ea5t 49W cho c\u00e1c thi\u1ebft b\u1ecb. Tuy nhi\u00ean, \u0111\u1ec3 chu\u1ea9n n\u00e0y \u0111\u01b0\u1ee3c ho\u1ea1t \u0111\u1ed9ng b\u00ecnh th\u01b0\u1eddng th\u00ec h\u1ec7 th\u1ed1ng cable \u0111\u00f4i xo\u1eafn ph\u1ea3i c\u00f3 hi\u1ec7u su\u1ea5t cao. Tuy nhi\u00ean, \u0111\u1ec3 tri\u1ec3n khai \u0111\u01b0\u1ee3c chu\u1ea9n n\u00e0y th\u00ec ph\u1ea3i ch\u00fa \u00fd \u0111\u1ebfn th\u00f4ng s\u1ed1 hi\u1ec7u su\u1ea5t cable so v\u1edbi tr\u01b0\u1edbc \u0111\u00e2y.<\/p>\n

Chu\u1ea9n IEEE 802.3at PoE<\/strong><\/span><\/h3>\n

Chu\u1ea9n n\u00e0y h\u1ed7 tr\u1ee3 m\u1ed7i c\u1ed5ng t\u1ed1i \u0111a 30W. Trong m\u1ed9t \u1ee9ng d\u1ee5ng n\u1ebfu m\u1ed9t Switch h\u1ed7 t\u1ef1 chu\u1ea9n PoE+ th\u00ec t\u1ea5t nhi\u00ean c\u0169ng s\u1ebd h\u1ed7 tr\u1ee3 PoE. Tuy nhi\u00ean, nh\u1eefng Switch n\u00e0y s\u1ebd t\u1ef1 \u0111\u1ed9ng t\u01b0\u01a1ng th\u00edch v\u1edbi c\u00e1c thi\u1ebft b\u1ecb k\u1ebft n\u1ed1i v\u00e0 \u0111\u01b0a ra quy\u1ebft \u0111\u1ecbnh l\u00e0 c\u00f3 s\u1eed d\u1ee5ng PoE+, PoE hay ch\u1ec9 l\u00e0 s\u1eed d\u1ee5ng nh\u1eefng d\u1eef li\u1ec7u th\u00f4ng th\u01b0\u1eddng.<\/p>\n

Chu\u1ea9n IEEE 802.3af PoE<\/strong><\/span><\/h3>\n

N\u1ebfu s\u1eed d\u1ee5ng chu\u1ea9n n\u00e0y cho c\u00e1c \u1ee9ng d\u1ee5ng th\u00ec b\u1ea1n kh\u00f4ng c\u1ea7n ph\u1ea3i t\u00e1ch ri\u00eang d\u00e2y ngu\u1ed3n \u0111\u1ec3 duy tr\u00ec ngu\u1ed3n \u0111i\u1ec7n cho c\u00e1c thi\u1ebft b\u1ecb m\u1ea1ng. B\u1edfi chu\u1ea9n IEEE 802.3af PoE c\u00f3 th\u1ec3 cung c\u1ea5p ngu\u1ed3n \u0111i\u1ec7n l\u00ean t\u1edbi 48VDC v\u1edbi c\u00f4ng su\u1ea5t l\u00e0 12,95W.<\/p>\n

Tuy nhi\u00ean \u0111\u1ec3 c\u00e1c \u1ee9ng d\u1ee5ng c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng chu\u1ea9n n\u00e0y th\u00ec c\u00e1c thi\u1ebft b\u1ecb c\u1ea5p ngu\u1ed3n tr\u00ean Ethernet ph\u1ea3i \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a, ph\u00e2n lo\u1ea1i v\u00e0 c\u00f3 kh\u1ea3 n\u0103ng \u0111i\u1ec1u khi\u1ec3n trong qu\u00e1 tr\u00ecnh kh\u1edfi \u0111\u1ed9ng, \u0111\u00e1p \u1ee9ng \u0111\u01b0\u1ee3c c\u00e1c y\u00eau c\u1ea7u v\u1ec1 c\u00e1ch ly gi\u1eefa ngu\u1ed3n v\u00e0 d\u1eef li\u1ec7u.<\/p>\n\n\n\n

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

Nhu c\u1ea7u l\u1eafp \u0111\u1eb7t h\u1ec7 th\u1ed1ng camera an ninh gi\u00e1m s\u00e1t cho nh\u00e0 x\u01b0\u1edfng, x\u00ed nghi\u1ec7p ng\u00e0y c\u00e0ng tr\u1edf n\u00ean ph\u1ed5 bi\u1ebfn. […]<\/p>\n","protected":false},"author":1,"featured_media":6151,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[57],"tags":[],"class_list":["post-3958","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ho-tro"],"_links":{"self":[{"href":"https:\/\/pronetsolutionsvn.com\/index.php?rest_route=\/wp\/v2\/posts\/3958","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pronetsolutionsvn.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/pronetsolutionsvn.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/pronetsolutionsvn.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/pronetsolutionsvn.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=3958"}],"version-history":[{"count":0,"href":"https:\/\/pronetsolutionsvn.com\/index.php?rest_route=\/wp\/v2\/posts\/3958\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pronetsolutionsvn.com\/index.php?rest_route=\/wp\/v2\/media\/6151"}],"wp:attachment":[{"href":"https:\/\/pronetsolutionsvn.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=3958"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/pronetsolutionsvn.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=3958"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/pronetsolutionsvn.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=3958"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}