, , . . MPEG-2, MPEG-4. , , IPTV- MPEG-2 ( , - ).
IPTV-, . MPEG- IP- , -, IP-.
, IP- (IP-encapsulation). , MPEG- 188- . MPEG- PDU (Protocol Data Unit)-. . 2.3.
MAC Header |
MPEG Transport Packed |
MPEG Transport Packed |
MPEG Transport Packed |
MPEG Transport Packed |
MPEG Transport Packed |
Protocol Header |
Protokol Header |
MPEG Transport Packed |
MPEG Transport Packed |
UDP Header |
IP Header |
CRS |
. 2.3. MPEG IP |
. 2.4. MPEG UDP/IP over Ethernet |
MPEG Transport Packed |
Network Packet Payload |
Network Packed |
Protocol Header |
Payload (MPEG) |
Protocol Trailer |
MPEG Bitsream |
(Header) IP- (Trailer) .
MPEG- Gigabit Ethernet. . 2.4 MPEG over UDP/ IP over Gigabit Ethernet. CRC (Cyclic Redundancy Code) , . 2.5 MPEG over Gigabit Ethernet RTP. RTP (Real-time Transport Protocol) , . RTP UDP (User Datagram Protocol), TCP/IP IP. RTP- (Protocol Header).
, . 2.6 IP-, MPEG-, ATM-. MPEG over UDP/IP ATM I- (RFC2684 LLC- ).
AAL-5 RFC2684 ATM- . , , UDP RTP. (bridged) Ethernet Ethernet MAC IP-.
|
|
MPEG- (native , ) ATM . 2.7.
, MPEG over Native ATM, , . 2.5, UDP/IP- RFC2684- ( Native () ATM, - ). , ATM-.
UDP/IP (SPTS) ATM-, Native ATM.
IPTV- SDH. Ethernet- STM- , ATM-. , SDH-, NGSDH RPR, IP-, ATM- . , ATM-, SDH RPR- .
, -.
RTSP (Real-Time Streaming Protocol) - . . , .
RTP (Real-time Transport Protocol) , .
RTCP (Real-Time Control Protocol) RTP , .
IGMP (Internet Group Membership Protocol) .
IP-, IP-, . , multiast-, .
MPEG-2 IP- , 3,5 6 /. , , . IP- IP-multicast, IP-unicast.
|
|
IP- -. IP- QoS (Quality of Service). . ( , ). .
IP-; unicast, broadcast multicast.
IP- IP-. IP- . .
unicast ( ) , , . , . unicast IP-. STB, . 2.8.
. 2.8. unicast
, unicast , ( ). Gigabit Ethernet 1 / , , . , , unicast. , 5 / MPEG-2 , unicast, 100. (. . 1.2).
broadcast ( ) IP-, IP-. , IP- 255 (, 192.0.2.255) 255 (255.255.255.255).
, broadcast ( STB) . . , broadcast . broadcast . 2.9.
. 2.9. broadcast
multicast ( ) , , . IPTV, (. 2.10).
. 2.10. multicast
multicast IP- , 224.0.0.0 239.255.255.255. IP- D.
unicast multicast ( STB). multicast, , .. . , IPTV . broadcast-, .
|
|
, multicast- IP- , multicast. IGMP ( ).
IGMP :
IGMP report ;
;
multicast IGMP; ;
IGMP , .
multicast . Gigabit Ethernet- (, multicast -) 120 MPEG-2 (4 /).
, IPTV- : broadcast, multicast unicast. , , IP- . , , . .
, IP-.
IP- . .
ADSL, Ethernet-, PON WiMAX.