-
7/28/2019 AON v PON
1/4
AON v PON(phn 1)
I-Tng quan
Vi nhng u im ni tri v bng thng v cht lng ng truyn so vi cp ng
truyn thng, si quang
v ang n su vo i sng cng ngh. Hin nay, c 2 cng ngh mng truyn dn
quang ang c s dng rng
ri l Active Optical Network(AON)-mng quang ch ng v Passvice
Optical Network(PON)-mng quang th ng.
gip cc bn c c mt s phn bit tng i v 2 cng ngh ny, ti xin post mt
s tm hiu ca mnh
cc bn tham kho.
S khc bit chyu ca mng quang ch ng(AON) v mng quang th ng(PON) l
ch PON s dng mt
thit b chia quang th ng: passive splitter. V c bn, Splitter l mt
lng knh khuch tn tn hiu nh sng ti
khch hng khng cn s dng thit b in(mt switch quang khng dng in ).
Do , n c tn l th ng.
II-M hnh mng truyn dn
Mc tiu ca c AON v PON l u mng tn hiu quang ti tn nh khch hng,
nng cao cht lng ng
truyn v bng thng.
M hnh mng
Active Optical Network(AON)
http://snt.com.vn/blog/wp-content/uploads/2011/02/AON.pnghttp://snt.com.vn/blog/wp-content/uploads/2011/02/langkinh1.pnghttp://snt.com.vn/blog/wp-content/uploads/2011/02/AON.pnghttp://snt.com.vn/blog/wp-content/uploads/2011/02/langkinh1.pnghttp://snt.com.vn/blog/wp-content/uploads/2011/02/AON.pnghttp://snt.com.vn/blog/wp-content/uploads/2011/02/langkinh1.png
-
7/28/2019 AON v PON
2/4
Passive Optical Network(PON)
Mng AON l m hnh mng point-to-point, mi khch hng chim dng 1 ng
quang xuyn sut khng chia s t
phng my ca nh cung cp dch v ti tn gia nh hoc thit b trp trung ca
khch hng.
Trong khi , im u tin ca mng PON l OLT(Optical Line Terminal). Ti
y, cc interface 1Gbps,
10Gbps..(cn cao hn na trong tng lai) ni ln mng core v cc
interface PON ni xung nh khch hng. Ti
khch hng, 1 passive splitter chia tn hiu ti n khch hng. M hnh
mng: point-to-multipoint, c th hnh dung cy
PON vi mi khch hng l mt nhnh ca cy. Hin nay s lng ti a khch hng
chia s 1 ng truyn l 64,
v cn ph thuc vo suy hao ca ng truyn v b chia.Kiu mng PON thng gp
hin nay l: Ethernet-
PON(EPON), Giga-Ethernet-PON(GEPON), Gigabit-PON(GPON)Cc cng ngh
ny u da trn chun IEEE
802.3 Ethernet.
Chun GPON hin ti t ti tc download 2.5Gbps v upload 1.25Gbps ln
mng core.Mt s m hnh dch v ng dng trong thc t:
http://snt.com.vn/blog/wp-content/uploads/2011/02/PON1.png
-
7/28/2019 AON v PON
3/4
AON
http://snt.com.vn/blog/wp-content/uploads/2011/02/PON-app.pnghttp://snt.com.vn/blog/wp-content/uploads/2011/02/AON-app.pnghttp://snt.com.vn/blog/wp-content/uploads/2011/02/PON-app.pnghttp://snt.com.vn/blog/wp-content/uploads/2011/02/AON-app.png
-
7/28/2019 AON v PON
4/4
PON
Trn y l mt s so snh v mt m hnh mng ca 2 cng ngh mng quang th ng
v ch ng.
Trong bi vit tip theo, ti s a ra nhng so snh v mt s kha cnh khc
gia hai cng ngh ny nh: chi ph
u t kinh t, hiuqu cp pht bng thng, ng truyn
