Cac cach bam day mang RJ45.

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Cac cach bam day mang RJ45

May tinh ngay nay da tro thanh mot phan khong the thieu trong cong viec cung nhu cuoc song hang ngay cua chung ta. De cac may tinh co the lam viec hieu qua va tiet kiem hon - chung can phai duoc noi mang voi nhau nham chia se thong tin, tai nguyen....

Cac cach bam day mang RJ45 - Ban co dau.
Cac cach bam day mang RJ45 - Ban khong dau.
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Cac cach bam day mang RJ45.

Cac cach bam day mang RJ45.

 

Co rat nhieu cac chuan ve cap mang khac nhau nhung trong khuon kho bai viet nay toi chi xin trinh bay ve cac chuan su dung trong mang LAN (Local Area Network). Thong thuong nguoi ta su dung cap dong truc (Coaxial Cable) hoac cap xoan khong boc UTP (Unshielded Twisted Pair). Loai cap dong truc hien da loi thoi do toc do thap (10 Mbps) va hien nay rat it noi con su dung.

Cap xoan UTP lai duoc chia ra lam nhieu tieu chi (CAT - Category) khac nhau, nhung pho bien nhat trong mang LAN  la 2 loai CAT-5 va CAT-6 (100Mbps va 1000Mbps).


CAT-5 gom co 4 cap day = 8 day voi cac mau xanh duong, trang - xanh duong, da cam, trang - da cam, xanh la cay, trang - xanh la cay, nau, trang - nau. Cu 2 day co mau giong nhau duoc xoan thanh 1 cap va 4 cap nay lai duoc xoan voi nhau va xoan voi 1 soi day nylon chiu luc keo, ben ngoai duoc boc bang vo nhua.

Cap UTP di voi dau noi RJ-45 (RJ - Registered Jack), RJ-45 bang nhua cung trong suot co 8 chan bang dong, khi dua dau day vao roi dung kim bam day de bam thi 8 chan nay se ghim vao 8 soi day CAT-5.


Co 2 chuan bam day duoc su dung la T568A va T568B. Hinh ve sau mo ta thu tu cac day duoc sap xep khi ta ngua dau RJ-45 (phia co cac chan tiep xuc) va nhin tu trai qua phai.

 Thong thuong, khi bam day de noi tu PC vao HUB ta co the bam ca 2 dau day voi cung 1 chuan: cung la T568A hoac cung T568B. Luc nay ta co day cap thang (Straight Through).



Khi bam day de noi tu PC den PC (truong hop chi co 2 may tinh) hoac tu HUB/SWITCH vao HUB/SWITCH (day link trong truong hop muon noi 2 HUB/SWITCH lai voi nhau) ta bam 1 dau day theo chuan T568A con dau kia theo chuan T568B. Day goi la day cap cheo (Cross Over)


Nhu cac ban thay chi co 4 day trong so 8 soi day duoc su dung la 1, 2, 3, 6 - tuong ung voi 4 day tin hieu TX+, TX- (TX - Transmit), RX+, RX- (RX - Receive) cua card  mang (NIC - Network Interface Card).



Tong hop lai thi chi co 2 chuan bam day va 2 loai day ke tren. Chuc cac ban thanh cong 


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Updated: 28/03/2008 | Views: 3402 | Comments: 0

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