{"id":4717,"date":"2025-10-15T11:12:00","date_gmt":"2025-10-15T11:12:00","guid":{"rendered":"https:\/\/lp.szlogic.cn\/knowledge-center\/ieee-802-3af-vs-ieee-802-3at-vs-ieee-802-3bt\/"},"modified":"2026-06-22T06:21:04","modified_gmt":"2026-06-22T06:21:04","slug":"ieee-802-3af-vs-ieee-802-3at-vs-ieee-802-3bt","status":"publish","type":"post","link":"https:\/\/resources.l-p.com\/vi\/knowledge-center\/ieee-802-3af-vs-ieee-802-3at-vs-ieee-802-3bt","title":{"rendered":"T\u00ecm hi\u1ec3u v\u1ec1 IEEE 802.3af, 802.3at v\u00e0 802.3bt: S\u1ef1 ti\u1ebfn h\u00f3a c\u1ee7a PoE"},"content":{"rendered":"
\"Understanding<\/figure>\n\n\n\n

\ud83d\udd04 <\/strong>Gi\u1edbi thi\u1ec7u: S\u1ee9c m\u1ea1nh ng\u00e0y c\u00e0ng t\u0103ng c\u1ee7a Ethernet<\/h2>\n\n\n\n

Cung c\u1ea5p \u0111i\u1ec7n qua Ethernet (PoE<\/strong>) \u0111\u00e3 c\u00e1ch m\u1ea1ng h\u00f3a c\u00e1ch c\u00e1c m\u1ea1ng hi\u1ec7n \u0111\u1ea1i truy\u1ec1n c\u1ea3 d\u1eef li\u1ec7u v\u00e0 \u0111i\u1ec7n n\u0103ng tr\u00ean m\u1ed9t c\u00e1p duy nh\u1ea5t.
T\u1eeb vi\u1ec7c c\u1ea5p ngu\u1ed3n cho \u0111i\u1ec7n tho\u1ea1i IP \u0111\u1ebfn c\u00e1c \u0111i\u1ec3m truy c\u1eadp hi\u1ec7u n\u0103ng cao v\u00e0 m\u00e0n h\u00ecnh, c\u00e1c ti\u00eau chu\u1ea9n PoE\u2014IEEE 802.3af<\/strong><\/a>, 802.3at<\/strong><\/a>, and 802.3bt<\/strong><\/a>\u2014x\u00e1c \u0111\u1ecbnh m\u1ee9c c\u00f4ng su\u1ea5t t\u1ed1i \u0111a c\u00f3 th\u1ec3 truy\u1ec1n an to\u00e0n v\u00e0 hi\u1ec7u qu\u1ea3 qua c\u00e1p Ethernet.<\/p>\n\n\n\n

Khi c\u00e1c thi\u1ebft b\u1ecb k\u1ebft n\u1ed1i y\u00eau c\u1ea7u c\u00f4ng su\u1ea5t cao h\u01a1n, c\u00f4ng ngh\u1ec7 PoE \u0111\u00e3 ph\u00e1t tri\u1ec3n \u0111\u1ec3 b\u1eaft k\u1ecbp \u2014 ti\u1ebfn t\u1eeb PoE (15,4 W)<\/strong> to PoE+ (30 W)<\/strong> v\u00e0 cu\u1ed1i c\u00f9ng l\u00e0 PoE++ (l\u00ean \u0111\u1ebfn 100 W)<\/strong>.<\/p>\n\n\n\n

\ud83d\udd04 <\/strong>T\u1ed5ng quan v\u1ec1 c\u00e1c ti\u00eau chu\u1ea9n PoE<\/h2>\n\n\n\n
\n\n<\/colgroup>

Thu\u1ed9c t\u00ednh \/ Ti\u00eau chu\u1ea9n<\/p><\/th>

IEEE 802.3af<\/p><\/th>

IEEE 802.3at<\/p><\/th>

IEEE 802.3bt (Lo\u1ea1i 3)<\/p><\/th>

IEEE 802.3bt (Lo\u1ea1i 4)<\/p><\/th><\/tr>

T\u00ean th\u00f4ng d\u1ee5ng<\/p><\/td>

PoE<\/p><\/td>

PoE+<\/p><\/td>

PoE++<\/p><\/td>

PoE++<\/p><\/td><\/tr>

N\u0103m ban h\u00e0nh c\u1ee7a IEEE<\/p><\/td>

2003<\/p><\/td>

2009<\/p><\/td>

2018<\/p><\/td>

2018<\/p><\/td><\/tr>

C\u00f4ng su\u1ea5t \u0111\u1ea7u ra c\u1ee7a Thi\u1ebft b\u1ecb C\u1ea5p Ngu\u1ed3n (PSE)<\/p><\/td>

15,4 W<\/p><\/td>

30 W<\/p><\/td>

60 W<\/p><\/td>

100W<\/p><\/td><\/tr>

C\u00f4ng su\u1ea5t kh\u1ea3 d\u1ee5ng t\u1ea1i Thi\u1ebft b\u1ecb \u0110\u01b0\u1ee3c C\u1ea5p Ngu\u1ed3n (PD)<\/p><\/td>

12,95 W<\/p><\/td>

25,5 W<\/p><\/td>

51 W<\/p><\/td>

71\u201390 W<\/p><\/td><\/tr>

S\u1ed1 c\u1eb7p d\u00e2y d\u00f9ng \u0111\u1ec3 truy\u1ec1n c\u00f4ng su\u1ea5t<\/p><\/td>

2 c\u1eb7p<\/p><\/td>

2 c\u1eb7p<\/p><\/td>

4 c\u1eb7p<\/p><\/td>

4 c\u1eb7p<\/p><\/td><\/tr>

Typical Cable Type<\/p><\/td>

Cat5 ho\u1eb7c cao h\u01a1n<\/p><\/td>

c\u00e1p Ethernet Cat5e ho\u1eb7c cao h\u01a1n<\/p><\/td>

c\u00e1p \u0111\u1ed3ng tr\u1ee5c Cat5e\/Cat6<\/p><\/td>

Cat6\/Cat6A<\/p><\/td><\/tr>

C\u00e1c \u1ee9ng d\u1ee5ng ch\u1ee7 ch\u1ed1t<\/p><\/td>

\u0110i\u1ec7n tho\u1ea1i VoIP, camera IP, \u0111i\u1ec3m truy c\u1eadp kh\u00f4ng d\u00e2y<\/p><\/td>

Camera PTZ, \u0111i\u1ec3m truy c\u1eadp b\u0103ng t\u1ea7n k\u00e9p, m\u00e1y kh\u00e1ch m\u1ecfng<\/p><\/td>

\u0110i\u1ec3m truy c\u1eadp Wi-Fi 6, chi\u1ebfu s\u00e1ng LED, t\u1ef1 \u0111\u1ed9ng h\u00f3a t\u00f2a nh\u00e0<\/p><\/td>

Bi\u1ec3n qu\u1ea3ng c\u00e1o k\u1ef9 thu\u1eadt s\u1ed1, c\u1ed5ng IoT, m\u00e1y t\u00ednh mini<\/p><\/td><\/tr><\/tbody>\n<\/table>\n<\/figure>\n\n\n\n

\ud83d\udd04 <\/strong>So s\u00e1nh k\u1ef9 thu\u1eadt v\u00e0 kh\u1ea3 n\u0103ng cung c\u1ea5p c\u00f4ng su\u1ea5t<\/h2>\n\n\n\n
\"Technical<\/figure>\n\n\n\n

1. IEEE 802.3af (PoE)<\/a><\/h3>\n\n\n\n