㳿 FTTN
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, . , , Internet , , . , .
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, , . 㳿 FTTx PON. Internet. , , , , -, 볺, .
nbsp; ˲ ò FTTx
ϳ , ' , 볔. ? , 㳿 (QoS), , ' . , FTTx.
: Fiber To The X FTTx (. fiber to the x - X) - - ' , ' ( X) - , , , - ( , ). , FTTx - . . FTTx ' . [1]
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. , 볺 . 㳿, FTTx, (xDSL), - (HFC), (DBC) (Ethernet) FTTx.
: FTTx :
FTTN (Fiber to the Node) - ,
FTTC (Fiber to the Curb) - , , FTTB (Fiber to the Building) - ,
FTTH (Fiber to the Home) - ( ).
, . [2]
.1. , FTTx.
FTTH , . , CO (Central office) N . N*L fibers ( ) 2N transceivers ( ) , , .2. , CO Curb switch ( ), N*L . , Passive optical spliter ( ). transceivers N+1.
.2. FTTH.
㳿 PON.
: PON (Passive optical network) - .
PON - , . PON 䳺 , . [1]
, ( , 㳿 ), , .
: PON - OLT (optical line terminal) ONT (optical network terminal 㳿 ITU-T), ONU (optical network unit 㳿 IEEE) . [1]
PON. , OLT , , ' POS, , ONU - 64 (.3.).
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.3. PON.
PON , , FTTx, ONU , ONU , , . :
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: , OLT, , . OLT ONT - () , , 1490 . , , () , 1310 . 1550 . OLT ONT WDM, .
, . ONT, , . , .
. ONT , TDMA (time division multiple access). ONT, c , ' ONT OLT. [1]
PON - GEPON, , Ethernet TCP/IP.
: 2000 LMSC (LAN / MAN standards committee) IEEE "Ethernet " EFM (Ethernet in the first mile) 802.3ah, PON, Ethernet. EFMA (Ethernet in the first mile alliance), 2001 . EFMA EFM . EFM IEEE, EFMA 㳿. - , IEEE 802.3ah, IEEE 802.17. [3]
㳿 GEPON 1. 16, - Triple play. , VoIP, VoD, Analog TV (.4).
1. GEPON.
IEEE/EFMA | |
2004. | |
IEEE802.3ah | |
, / , / | 2500/2500 |
Ethernet | |
˳ | 8B/10B |
, | |
Triple play | |
: OLT ONU , . , --, . . , . .
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' FTTx GEPON, . ³ , , , ' 16, .
.4. GEPON.
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- Frame Relay;
- ' ATM;
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- (HDTV);
- -- (VoD);
- TV.
, FTTH , . . 볺 20 . .
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