Mang bang thong rong.

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Mang bang thong rong

Cac mang truyen thong hien nay thuong chi cung cap mot vai loai dich vu thong tin. Trong khi do, nhu cau trao doi thong tin cua nguoi su dung ngay cang gia tang va da dang, doi hoi kha nang ket noi moi noi moi luc va toc do truy cap cao. Mang bang thong rong (broadband network) la mot huong phat trien co nhieu tiem nang de dap ung nhu cau nay..

Mang bang thong rong - Ban co dau.
Mang bang thong rong - Ban khong dau.
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Mang bang thong rong.

Mang bang thong rong.

Nguoi ta rat mong muon co mot mang don le cung cap tat ca cac dich vu  thong tin  lien lac nhu dien thoai, e-mail, truy cap  Internet, xem phim, nghe nhac… de tan dung hieu qua cua viec chia se  tai nguyen  mang. Yeu to kinh te  nay da la dong co thuc day viec phat trien mot mang dich vu  tich hop. Su tich hop se giup don gian hoa viec quan ly mang, tang tinh linh hoat trong viec cai tien cac dich vu  hien huu cung nhu gioi thieu  cac dich vu  moi. Voi nhung tien bo trong cong nghe  bang thong rong va xu ly thong tin  voi toc do cao, viec trien khai mot mang tich hop nhu the khong con la mot uoc mo nua.

Cac du an mang bang thong rong

Mot mang vien thong  ly tuong can co cac dac tinh : bang thong rong, truyen thong  da phuong tien, truy cap  da diem, toc do truyen tai o nhieu cap do, va dich vu  da dang. No co the chuyen tai thong tin  o dang du lieu, am thanh, hinh anh  tinh, video  hay bat ky su ket hop nao giua cac dang thong tin  nay. Trong khi do, moi dang thong tin  lai co nhung yeu cau rieng ve bang thong, do tre va do chuan xac khi duoc phan phoi tren mang. Vi vay, mot mang bang thong rong co thanh phan va cau truc rat phuc tap.

Hien nay, mang bang thong rong thuong duoc trien khai rong rai la he thong  B-ISDN (Broadband Integrated Services Digital  Network – Mang tich hop cac dich vu  ky thuat  so tren nen bang thong rong) co toc do truyen tai du lieu  tu 2 Mbps  den hang tram Mbps. He thong  nay chu yeu su dung phuong thuc truyen tai khong dong bo (Asynchronous Transfer Mode – ATM), cho phep luu chuyen cung mot luc dich vu  thoai dong bo va dich vu  du lieu  khong dong bo.

B-ISDN duoc Uy ban  Tu van quoc te  ve dien thoai  va dien bao (CCITT) thuoc Hiep hoi  Vien thong  quoc te  (ITU) phat trien tu nam 1988 de cung cap mot ke hoach  chi tiet cho viec tich hop cac dich vu  thoai, video  va du lieu  (triple play) trong the ky  21. Kien truc B-ISDN su dung ATM  o tang lien ket du lieu  (data link layer) de chuyen mach va SONET (Synchronous Optical Network – mang cap quang  dong bo) o tang vat ly (physical layer) de cung cap nhung ket noi toc do cao.

Do phai phuc vu cho cac nhu cau dich vu  het suc da dang nen mang B-ISDN phai co cau truc phan tang, gom mang cua nguoi su dung, mang truy cap, mang trung ke (trunk network) va mang duong dai. Ngoai ra con co mang quan ly (Telecommunication Management  Network – TMN) va mang thong minh  (Intelligent Network – IN) la hai mang giam sat, dieu hanh, bao hieu va cung cap cac dich vu  thong minh  cho B-ISDN.

Mot trong nhung cong nghe  cap quang  dang duoc nhieu nuoc tren the gioi  trien khai la mang cap quang  den tan nha (Fiber To The Home – FTTH), mot cong nghe  bang thong rong co toc do nhanh hon DSL. Thang 9-2005, hang Verizon o Bac My cung da gioi thieu  du an FiOS (Fiber Optic Service), mot dich vu  vien thong  su dung mot duong cap quang  chay thang den nha nguoi tieu dung, cung cap moi dich vu  tu thoai, du lieu  Internet  den ti-vi co do phan giai  cao. Hang nay hy vong den nam 2010  se co khoang 3-4 trieu nguoi dang ky su dung dich vu  nay.

Trong khi do, tu thang 12-2003, Lien minh chau Au  (EU) da thuc hien du an Broadwan voi muc dich phat trien cong nghe  va kien truc mang bang thong rong, trong do tap trung vao phuong thuc truy cap  khong day. Du an nay se cung cap cac dich vu  bang thong rong cho tat ca moi nguoi o chau Au. Broadwan co 25 doi tac tham gia, gom cac nha dieu hanh mang, cac cong ty  vien thong, cac hoc vien va cac hang tu van trong nganh den tu muoi quoc gia  Au chau.
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Updated: 29/02/2008 | Views: 252 | Comments: 0

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