{"id":1364,"date":"2012-03-01T11:16:20","date_gmt":"2012-03-01T04:16:20","guid":{"rendered":"http:\/\/snt.com.vn\/blog\/?p=1364"},"modified":"2012-03-01T11:16:20","modified_gmt":"2012-03-01T04:16:20","slug":"cong-ngh%e1%bb%87-truy%e1%bb%81n-d%e1%ba%abn-vdsl","status":"publish","type":"post","link":"https:\/\/snt.com.vn\/blog\/cong-ngh%e1%bb%87-truy%e1%bb%81n-d%e1%ba%abn-vdsl\/","title":{"rendered":"C\u00f4ng ngh\u1ec7 truy\u1ec1n d\u1eabn VDSL"},"content":{"rendered":"

C\u00f4ng ngh\u1ec7 VDSL (Very high bit-rate DSL) VDSL c\u00f3 th\u1ec3 \u0111em \u0111\u1ebfn cho ng\u01b0\u1eddi d\u00f9ng b\u0103ng th\u00f4ng \u0111\u00e1ng kinh ng\u1ea1c, t\u1ed1c \u0111\u1ed9 c\u00f3 th\u1ec3 l\u00ean \u0111\u1ebfn 52Mb\/s. N\u1ebfu so s\u00e1nh v\u1edbi t\u1ed1c \u0111\u1ed9 8-10Mb\/s c\u1ee7a ADSL (Asymmetric DSL) v\u00e0 modem c\u00e1p th\u00ec b\u0103ng th\u00f4ng m\u00e0 c\u00f4ng ngh\u1ec7 VDSL \u0111em l\u1ea1i c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c coi l\u00e0 m\u1ed9t b\u01b0\u1edbc ti\u1ebfn quan tr\u1ecdng gi\u1ed1ng nh\u01b0 vi\u1ec7c chuy\u1ec3n t\u1eeb modem 56K sang modem c\u00e1p hay ADSL<\/p>\n

C\u01a1 B\u1ea3n V\u1ec1 DSL (Digital Subscriberline).<\/strong><\/p>\n

\u0110\u01b0\u1eddng d\u00e2y \u0111i\u1ec7n tho\u1ea1i th\u00f4ng th\u01b0\u1eddng t\u1ea1i nh\u00e0 b\u1ea1n th\u01b0\u1eddng l\u00e0 m\u1ed9t \u0111\u00f4i d\u00e2y \u0111\u1ed3ng. \u0110\u00f4i d\u00e2y \u0111\u1ed3ng n\u00e0y c\u00f3 th\u1ec3 chuy\u1ec3n t\u1ea3i l\u01b0\u1ee3ng d\u1eef li\u1ec7u nhi\u1ec1u h\u01a1n ngo\u00e0i c\u00e1c cu\u1ed9c tho\u1ea1i. Vi\u1ec7c s\u1eed d\u1ee5ng \u0111\u00f4i d\u00e2y n\u00e0y \u0111\u1ec3 truy\u1ec1n ti\u1ebfng n\u00f3i, th\u1eadt s\u1ef1 ch\u1ec9 khai th\u00e1c \u0111\u01b0\u1ee3c m\u1ed9t ph\u1ea7n kh\u1ea3 n\u0103ng c\u1ee7a n\u00f3. DSL s\u1eed d\u1ee5ng \u0111\u01b0\u1ee3c ph\u1ea7n kh\u1ea3 n\u0103ng c\u00f2n l\u1ea1i c\u1ee7a d\u00e2y \u0111i\u1ec7n tho\u1ea1i m\u00e0 kh\u00f4ng h\u1ec1 l\u00e0m gi\u00e1n \u0111o\u1ea1n vi\u1ec7c th\u1ef1c hi\u1ec7n c\u00e1c cu\u1ed9c tho\u1ea1i.<\/p>\n

D\u1ecbch v\u1ee5 \u0111i\u1ec7n tho\u1ea1i chu\u1ea9n c\u00f3 gi\u1edbi h\u1ea1n t\u1ea7n s\u1ed1 m\u00e0 c\u00e1c b\u1ed9 chuy\u1ec3n \u0111\u1ed5i, m\u00e1y \u0111i\u1ec7n tho\u1ea1i v\u00e0 c\u00e1c thi\u1ebft b\u1ecb kh\u00e1c c\u00f3 th\u1ec3 th\u1ef1c hi\u1ec7n. Gi\u1ecdng n\u00f3i c\u1ee7a con ng\u01b0\u1eddi, trong \u0111i\u1ec1u ki\u1ec7n giao ti\u1ebfp th\u00f4ng th\u01b0\u1eddng, c\u00f3 t\u1ea7n s\u1ed1 t\u1eeb 400 \u2013 3400 Hertz, trong khi b\u1ea3n ch\u1ea5t s\u1ee3i d\u00e2y \u0111\u1ed3ng c\u00f3 kh\u1ea3 n\u0103ng x\u1eed l\u00fd c\u00e1c t\u1ea7n s\u1ed1 l\u00ean \u0111\u1ebfn v\u00e0i tri\u1ec7u Hertz. C\u00e1i ch\u00fang ta c\u1ea7n l\u00e0 m\u1ed9t c\u00f4ng ngh\u1ec7 cho ph\u00e9p g\u1eedi \u0111i c\u00e1c d\u1eef li\u1ec7u s\u1ed1 c\u00f3 th\u1ec3 t\u1eadn d\u1ee5ng t\u1ed1t h\u01a1n kh\u1ea3 n\u0103ng c\u1ee7a d\u00e2y \u0111i\u1ec7n tho\u1ea1i m\u00e0 v\u1eabn an to\u00e0n. V\u00e0 DSL l\u00e0m \u0111\u01b0\u1ee3c \u0111i\u1ec1u \u0111\u00f3.<\/p>\n

\"\"<\/p>\n

C\u00e1c lo\u1ea1i DSL<\/strong><\/p>\n

Asymmetric DSLn\u00a0(ADSL): \u0110\u01b0\u1ee3c g\u1ecdi l\u00e0 \u201cb\u1ea5t \u0111\u1ed1i x\u1ee9ng\u201d v\u00ec t\u1ed1c \u0111\u1ed9 t\u1ea3i xu\u1ed1ng l\u1edbn h\u01a1n t\u1ed1c \u0111\u1ed9 t\u1ea3i l\u00ean. \u0110a ph\u1ea7n ng\u01b0\u1eddi s\u1eed d\u1ee5ng internet \u0111\u1ec1u xem v\u00e0 t\u1ea3i xu\u1ed1ng d\u1eef li\u1ec7u nhi\u1ec1u h\u01a1n l\u00e0 g\u1eedi hay t\u1ea3i l\u00ean.<\/p>\n

High bit-rate DSLn\u00a0(HDSL): Cung c\u1ea5p t\u1ed1c \u0111\u1ed9 truy\u1ec1n t\u01b0\u01a1ng \u0111\u01b0\u01a1ng v\u1edbi \u0111\u01b0\u1eddng truy\u1ec1n T1 (kho\u1ea3ng 1,5Mb\/s), HDSL nh\u1eadn v\u00e0 g\u1eedi d\u1eef li\u1ec7u c\u00f9ng m\u1ed9t t\u1ed1c \u0111\u1ed9, nh\u01b0ng n\u00f3 \u0111\u00f2i h\u1ecfi hai \u0111\u01b0\u1eddng d\u00e2y ri\u00eang, kh\u00f4ng chung v\u1edbi \u0111\u01b0\u1eddng d\u00e2y \u0111i\u1ec7n tho\u1ea1i c\u1ee7a b\u1ea1n.<\/p>\n

ISDN DSL (IDSL):n\u00a0T\u0103ng t\u1ed1c cho nh\u1eefng ng\u01b0\u1eddi \u0111ang d\u00f9ng ISDN. IDSL ch\u1eadm h\u01a1n so v\u1edbi c\u00e1c lo\u1ea1i DSL kh\u00e1c. IDSL lu\u00f4n ho\u1ea1t \u0111\u1ed9ng \u1edf t\u1ed1c \u0111\u1ed9 144Kb\/s, d\u00f9 nh\u1eadn hay g\u1eedi d\u1eef li\u1ec7u.<\/p>\n

Multiraten\u00a0Symmetric DSL (MSDSL): \u0110\u00e2y l\u00e0 m\u1ed9t lo\u1ea1i DSL \u0111\u1ed1i x\u1ee9ng c\u00f3 th\u1ec3 cung c\u1ea5p nhi\u1ec1u m\u1ee9c t\u1ed1c \u0111\u1ed9 do nh\u00e0 cung c\u1ea5p d\u1ecbch v\u1ee5 quy \u0111\u1ecbnh.<\/p>\n

Rate Adaptive DSLn\u00a0(RADSL): \u0110\u00e2y l\u00e0 bi\u1ebfn th\u1ec3 c\u1ee7a ADSL, cho ph\u00e9p modem \u0111i\u1ec1u ch\u1ec9nh t\u1ed1c \u0111\u1ed9 c\u1ee7a k\u1ebft n\u1ed1i t\u00f9y theo chi\u1ec1u d\u00e0i v\u00e0 ch\u1ea5t l\u01b0\u1ee3ng c\u1ee7a \u0111\u01b0\u1eddng d\u00e2y.<\/p>\n

Symmetric DSLn\u00a0(SDSL): Gi\u1ed1ng nh\u01b0 HDSL, lo\u1ea1i n\u00e0y c\u00f3 t\u1ed1c \u0111\u1ed9 nh\u1eadn v\u00e0 g\u1eedi d\u1eef li\u1ec7u nh\u01b0 nhau. Lo\u1ea1i n\u00e0y y\u00eau c\u1ea7u m\u1ed9t \u0111\u01b0\u1eddng d\u00e2y ri\u00eang.<\/p>\n

Very high bit-raten\u00a0DSL (VDSL): VDSL l\u00e0 lo\u1ea1i kh\u00f4ng \u0111\u1ed1i x\u1ee9ng, c\u00f3 t\u1ed1c \u0111\u1ed9 c\u1ef1c nhanh, nh\u01b0ng n\u00f3 ch\u1ec9 l\u00e0m vi\u1ec7c trong m\u1ed9t \u0111o\u1ea1n d\u00e2y \u0111i\u1ec7n tho\u1ea1i ng\u1eafn.<\/p>\n

Nguy\u00ean L\u00fd Ho\u1ea1t \u0110\u1ed9ng, Thi\u1ebft B\u1ecb<\/strong><\/p>\n

ADSL s\u1eed d\u1ee5ng 2 thi\u1ebft b\u1ecb: thi\u1ebft b\u1ecb cho kh\u00e1ch h\u00e0ng v\u00e0 thi\u1ebft b\u1ecb cho nh\u00e0 cung c\u1ea5p.\u00a0M\u00e1y thu ph\u00e1t: t\u1ea1i n\u01a1i s\u1eed d\u1ee5ng, kh\u00e1ch h\u00e0ng s\u1ebd \u0111\u01b0\u1ee3c l\u1eafp \u0111\u1eb7t m\u1ed9t m\u00e1y thu ph\u00e1t DSL. Thi\u1ebft b\u1ecb n\u00e0y c\u00f2n c\u00f3 th\u1ec3 d\u00f9ng trong nhi\u1ec1u d\u1ecbch v\u1ee5 kh\u00e1c v\u00e0 th\u01b0\u1eddng \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 \u201cmodem DSL\u201d, t\u00ean g\u1ecdi \u0111\u00fang l\u00e0 \u201cb\u1ed9 thu ph\u00e1t ADSL t\u1eeb xa\u201d (ATU-R \u2013 ADSL Transceiver Unit)<\/p>\n

M\u00e1y \u0111a th\u00e0nh ph\u1ea7n truy c\u1eadp DSL (DSL Access Multiplexer – DSLAM): C\u00e1c nh\u00e0 cung c\u1ea5p d\u1ecbch v\u1ee5 DSL s\u1eed d\u1ee5ng thi\u1ebft b\u1ecb DSLAM \u0111\u1ec3 nh\u1eadn k\u1ebft n\u1ed1i c\u1ee7a kh\u00e1ch h\u00e0ng.Thi\u1ebft b\u1ecb DSLAM ti\u1ebfp nh\u1eadn k\u1ebft n\u1ed1i c\u1ee7a ng\u01b0\u1eddi d\u00f9ng r\u1ed3i g\u1ed9p ch\u00fang v\u00e0o m\u1ed9t k\u1ebft n\u1ed1i internet duy nh\u1ea5t c\u00f3 kh\u1ea3 n\u0103ng ti\u1ebfp nh\u1eadn r\u1ea5t cao. Nh\u00ecn chung, c\u00e1c DSLAM \u0111\u1ec1u \u0111\u00e1ng tin c\u1eady v\u00e0 c\u00f3 kh\u1ea3 n\u0103ng h\u1ed7 tr\u1ee3 nhi\u1ec1u lo\u1ea1i DSL, c\u0169ng nh\u01b0 cung c\u1ea5p th\u00eam c\u00e1c ch\u1ee9c n\u0103ng kh\u00e1c nh\u01b0 router, c\u1ea5p s\u1ed1 IP \u0111\u1ed9ng.<\/p>\n

C\u00f4ng ngh\u1ec7 DSL ph\u1ee5 thu\u1ed9c v\u00e0o kho\u1ea3ng c\u00e1ch truy\u1ec1n t\u1ea3i. Khi kho\u1ea3ng c\u00e1ch truy\u1ec1n t\u1ea3i l\u1edbn, ch\u1ea5t l\u01b0\u1ee3ng t\u00edn hi\u1ec7u s\u1ebd gi\u1ea3m \u0111i. ADSL c\u00f3 kho\u1ea3ng c\u00e1ch truy\u1ec1n t\u1ea3i t\u1ed1i \u0111a kho\u1ea3ng 5460m – kho\u1ea3ng c\u00e1ch n\u00e0y t\u1eeb modem DSL \u0111\u1ebfn thi\u1ebft b\u1ecb DSLAM c\u1ee7a nh\u00e0 cung c\u1ea5p d\u1ecbch v\u1ee5. N\u1ebfu kho\u1ea3ng c\u00e1ch truy\u1ec1n d\u1eabn l\u1edbn h\u01a1n gi\u1edbi h\u1ea1n n\u00e0y th\u00ec ng\u01b0\u1eddi s\u1eed d\u1ee5ng ph\u1ea3i ch\u1ea5p nh\u1eadn t\u1ed1c \u0111\u1ed9 th\u1ea5p h\u01a1n r\u1ea5t nhi\u1ec1u so v\u1edbi b\u00ecnh th\u01b0\u1eddng.<\/p>\n

C\u00f3 th\u1ec3 b\u1ea1n s\u1ebd th\u1eafc m\u1eafc, n\u1ebfu kho\u1ea3ng c\u00e1ch l\u1edbn \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn ch\u1ea5t l\u01b0\u1ee3ng c\u1ee7a DSL, t\u1ea1i sao n\u00f3 l\u1ea1i kh\u00f4ng \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn ch\u1ea5t l\u01b0\u1ee3ng c\u1ee7a \u0111i\u1ec7n tho\u1ea1i th\u00f4ng th\u01b0\u1eddng. Xin tr\u1ea3 l\u1eddi r\u1eb1ng \u0111\u00f3 l\u00e0 nh\u1edd v\u00e0o c\u00e1c cu\u1ed9n d\u00e2y ph\u1ee5 t\u1ea3i m\u00e0 c\u00f4ng ty \u0111i\u1ec7n tho\u1ea1i \u0111\u00e3 l\u1eafp \u0111\u1eb7t tr\u00ean \u0111\u01b0\u1eddng d\u00e2y \u0111i\u1ec7n tho\u1ea1i. Tuy nhi\u00ean c\u00e1c cu\u1ed9n d\u00e2y ph\u1ee5 t\u1ea3i \u0111\u00f3 kh\u00f4ng th\u00edch h\u1ee3p v\u1edbi DSL v\u00ec n\u00f3 s\u1ebd l\u00e0m m\u1ea5t \u0111i to\u00e0n b\u1ed9 d\u1eef li\u1ec7u. \u0110i\u1ec1u \u0111\u00f3 c\u00f3 ngh\u0129a l\u00e0 n\u1ebfu \u0111\u01b0\u1eddng d\u00e2y \u0111i\u1ec7n tho\u1ea1i gi\u1eefa n\u01a1i l\u00e0m vi\u1ec7c ho\u1eb7c nh\u00e0 c\u1ee7a b\u1ea1n v\u1edbi c\u00f4ng ty \u0111i\u1ec7n tho\u1ea1i c\u00f3 l\u1eafp \u0111\u1eb7t cu\u1ed9n d\u00e2y ph\u1ee5 t\u1ea3i th\u00ec b\u1ea1n s\u1ebd kh\u00f4ng th\u1ec3 d\u00f9ng \u0111\u01b0\u1ee3c d\u1ecbch v\u1ee5 DSL. Ngo\u00e0i ra, c\u00f2n c\u00f3 v\u00e0i nguy\u00ean nh\u00e2n kh\u00e1c khi\u1ebfn b\u1ea1n kh\u00f4ng th\u1ec3 s\u1eed d\u1ee5ng \u0111\u01b0\u1ee3c d\u1ecbch v\u1ee5 ADSL: h\u1ec7 th\u1ed1ng c\u00e1p \u0111i\u1ec7n tho\u1ea1i l\u00e0 c\u00e1p quang, v\u00e0 kho\u1ea3ng c\u00e1ch c\u1ee7a b\u1ea1n qu\u00e1 xa so v\u1edbi nh\u00e0 cung c\u1ea5p d\u1ecbch v\u1ee5. H\u1ec7 th\u1ed1ng c\u00e1p \u0111i\u1ec7n tho\u1ea1i quang kh\u00f4ng cho ph\u00e9p b\u1ea1n s\u1eed d\u1ee5ng d\u1ecbch v\u1ee5 ADSL v\u00ec t\u00edn hi\u1ec7u ADSL kh\u00f4ng th\u1ec3 \u0111\u01b0\u1ee3c chuy\u1ec3n \u0111\u1ed5i trong qu\u00e1 tr\u00ecnh chuy\u1ec3n \u0111\u1ed5i analog \u2013 digital \u2013 analog (t\u01b0\u01a1ng t\u1ef1 \u2013 s\u1ed1 \u2013 t\u01b0\u01a1ng t\u1ef1) m\u00e0 h\u1ec7 th\u1ed1ng \u0111i\u1ec7n tho\u1ea1i b\u1eb1ng c\u00e1p quang hay s\u1eed d\u1ee5ng.<\/p>\n

VDSL<\/strong><\/p>\n

Nguy\u00ean t\u1eafc ho\u1ea1t \u0111\u1ed9ng c\u1ee7a VDSL c\u0169ng gi\u1ed1ng nh\u01b0 c\u1ee7a ADSL. VDSL c\u0169ng d\u00f9ng d\u00e2y \u0111\u1ed3ng nh\u01b0 d\u00e2y \u0111i\u1ec7n tho\u1ea1i \u0111\u1ec3 truy\u1ec1n t\u1ea3i. Tuy nhi\u00ean, c\u0169ng c\u00f3 v\u00e0i kh\u00e1c bi\u1ec7t. VDSL c\u00f3 th\u1ec3 \u0111\u1ea1t t\u1edbi t\u1ed1c \u0111\u1ed9 52Mb\/s (khi d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c truy\u1ec1n t\u1edbi m\u00e1y t\u00ednh c\u1ee7a b\u1ea1n) v\u00e0 16Mb\/s (khi b\u1ea1n truy\u1ec1n d\u1eef li\u1ec7u \u0111i). T\u1ed1c \u0111\u1ed9 n\u00e0y v\u01b0\u1ee3t xa t\u1ed1c \u0111\u1ed9 c\u1ee7a ADSL (8Mb\/s truy\u1ec1n t\u1edbi v\u00e0 800Kb\/s truy\u1ec1n \u0111i). Nh\u01b0ng VDSL l\u1ea1i c\u00f3 kho\u1ea3ng c\u00e1ch truy\u1ec1n t\u1ea3i t\u1ed1i \u0111a ng\u1eafn h\u01a1n so v\u1edbi ADSL, ch\u1ec9 1200m.<\/p>\n

L\u00e0m c\u00e1ch n\u00e0o m\u00e0 VDSL c\u00f3 th\u1ec3 \u0111\u1ea1t t\u1edbi t\u1ed1c \u0111\u1ed9 nh\u01b0 v\u1eady? \u0110\u00f3 l\u00e0 nh\u1edd c\u00e1p quang.<\/p>\n

B\u1eb1ng c\u00e1ch \u0111\u1eb7t m\u1ed9t m\u00e1y thu ph\u00e1t \u1edf nh\u00e0 b\u1ea1n v\u00e0 m\u1ed9t c\u1ed5ng n\u1ed1i (gateway) VDSL \u1edf h\u1ed9p n\u1ed1i th\u00ec gi\u1edbi h\u1ea1n kho\u1ea3ng c\u00e1ch truy\u1ec1n t\u1ea3i ch\u1ec9 c\u00f2n l\u00e0 v\u1ea5n \u0111\u1ec1 l\u00fd thuy\u1ebft. C\u1ed5ng n\u1ed1i s\u1ebd \u0111\u1ea3m b\u1ea3o cho qu\u00e1 tr\u00ecnh chuy\u1ec3n \u0111\u1ed5i analog \u2013 digital \u2013 analog, v\u1ed1n s\u1ebd l\u00e0m m\u1ea5t \u0111i d\u1eef li\u1ec7u khi\u1ebfn cho b\u1ea1n kh\u00f4ng th\u1ec3 s\u1eed d\u1ee5ng d\u1ecbch v\u1ee5 ADSL b\u1eb1ng c\u00e1p quang. Thi\u1ebft b\u1ecb n\u00e0y s\u1ebd bi\u1ebfn \u0111\u1ed5i d\u1eef li\u1ec7u th\u00e0nh xung \u00e1nh s\u00e1ng \u0111\u1ec3 c\u00f3 th\u1ec3 truy\u1ec1n \u0111i b\u1eb1ng c\u00e1p quang \u0111\u1ebfn nh\u00e0 cung c\u1ea5p d\u1ecbch v\u1ee5. T\u1ea1i \u0111\u00e2y, d\u1eef li\u1ec7u s\u1ebd \u0111\u01b0\u1ee3c g\u1eedi \u0111\u1ebfn cho m\u1ea1ng th\u00edch h\u1ee3p \u0111\u1ec3 \u0111i \u0111\u1ebfn \u0111\u00edch. Khi c\u1ed5ng n\u1ed1i VDSL nh\u1eadn \u0111\u01b0\u1ee3c t\u00edn hi\u1ec7u g\u1eedi cho m\u00e1y c\u1ee7a b\u1ea1n, n\u00f3 s\u1ebd chuy\u1ec3n \u0111\u1ed5i t\u00edn hi\u1ec7u nh\u1eadn \u0111\u01b0\u1ee3c r\u1ed3i g\u1eedi \u0111\u1ebfn m\u00e1y thu ph\u00e1t c\u1ee7a b\u1ea1n. T\u1ea5t c\u1ea3 c\u00e1c qu\u00e1 tr\u00ecnh \u0111\u00f3 di\u1ec5n ra trong v\u00f2ng m\u1ed9t ph\u1ea7n tri\u1ec7u c\u1ee7a gi\u00e2y.<\/p>\n","protected":false},"excerpt":{"rendered":"

C\u00f4ng ngh\u1ec7 VDSL (Very high bit-rate DSL) VDSL c\u00f3 th\u1ec3 \u0111em \u0111\u1ebfn cho ng\u01b0\u1eddi d\u00f9ng b\u0103ng th\u00f4ng \u0111\u00e1ng kinh ng\u1ea1c,<\/p>\n","protected":false},"author":9,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11,1],"tags":[95,290,306],"yoast_head":"\nC\u00f4ng ngh\u1ec7 truy\u1ec1n d\u1eabn VDSL - Blog SNT - C\u00f4ng Ty TNHH Si\u00eau Nh\u1eadt Thanh - Sao Nhanh Th\u1ebf<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/snt.com.vn\/blog\/cong-ngh\u1ec7-truy\u1ec1n-d\u1eabn-vdsl\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"C\u00f4ng ngh\u1ec7 truy\u1ec1n d\u1eabn VDSL - Blog SNT - C\u00f4ng Ty TNHH Si\u00eau Nh\u1eadt Thanh - 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