Multimedia systems allow for the delivery of various media types such as audio, video, graphics, and text across computer networks and the internet. Content can be delivered through both offline and online methods using various networking technologies and protocols. Common online delivery methods include unicast, which sends content to individual clients, and multicast, which sends content simultaneously to multiple clients.

1. ia Systems
520251: Multimed
Multimedia
Delivering
17 ¡กÑั¹นÂยÒาÂย¹น 2555

2. ´ดÔิ¨จÔิ·ท∙ÑัÅลÊสÒาÁมÒาÃร¶ถàเ¼ผÂยáแ¾พÃร‹‹äไ´ดŒŒËหÅลÒา¡กÇวÔิ¸ธÕี

3. offline

4. online

5. [ÍอÔิ¹นàเ·ท∙ÍอÃรàเ¹น็µต]
•TCP/IP
•Internet Service Provider (ISP)
•Dial-up
•ADSL
•3G

7. [ÍอÔิ¹นàเ·ท∙ÍอÃรàเ¹น็µต]
•TCP/IP
•Internet Service Provider (ISP)
•Dial-up
•ADSL
•3G

16. 16 NETWORKING FUNDAMENTALS
Connection Speed Text Graphics Multimedia
Type
20 kB 100 kB 2 MB
Dial-up (V.90) 56 kbps 2.9 s 14.6 s 5 min
ADSL basic 512 kbps 320 ms 1.6 s 32.8 s
typical 2 Mbps 82 ms 410 ms 8.4 s
premium 8 Mbps 20.5 ms 102 ms 2.1 s
Cable typical 512 kbps 320 ms 1.6 s 32.8 s
premium 2 Mbps 82 ms 410 ms 8.4 s
Satellite† 512 kbps 860 ms 2.1 s 33.3 s
Leased T1 1.5 Mbps 109 ms 546 ms 11.2 s
line
T3 44 Mbps 3.7 ms 19 ms 381 ms
G3 phone 2 Mbps 82 ms 410 ms 8.4 s
Abilene 100 Mbps 1.6 ms 8.2 ms 168 ms
† Includes latency.
Figure 16.1. Typical download times
Clients and Servers

17. Client-Server Model
•¡กÒาÃร¡กÃรÐะ¨จÒาÂย¢ขŒŒÍอÁมÙูÅล¢ขÍอ§งÃรÐะºบºบÁมÑัÅลµตÔิÁมÕีàเ´ดÕีÂย¨จÐะãใªชŒŒ¾พ×ื้¹น°ฐÒา¹น¢ขÍอ§ง
client-server model
•server ¤คÍอÂยÃรÑัºบ request áแÅลÐะµตÍอºบÊส¹นÍอ§งµต‹‹Íอ client
ÊสÓำËหÃรÑัºบ¢ขŒŒÍอÁมÙูÅลáแÅลÐะºบÃรÔิ¡กÒาÃรµต‹‹Òา§งæๆ

18. HTTP (HyperText Transfer Protocol)
•àเ»ปšš¹น protocol áแºบºบ§ง‹‹ÒาÂย·ท∙Õี่ÍอÍอ¡กáแºบºบàเ¾พ×ื่ÍอãใËหŒŒ´ดÓำàเ¹นÔิ¹น¡กÒาÃรÃรÑัºบ
Êส‹‹§งÍอÂย‹‹Òา§งÃรÇว´ดàเÃร็Çว¢ขÍอ§ง¢ขŒŒÍอÁมÙูÅลáแºบºบ hypermedia ÃรÐะËหÇว‹‹Òา§ง
Web Server (server) ¡กÑัºบ Web Browser (client)

19. Unicast - Multicast
Unicast Multicast
•àเ»ปšš¹นÅลÑั¡กÉษ³ณÐะ¢ขŒŒÍอÁมÙูÅลäไ»ปÂยÑั§ง •àเ»ปšš¹นÅลÑั¡กÉษ³ณÐะ¢ขŒŒÍอÁมÙูÅลäไ»ปÂยÑั§ง
¤คÍอÁม¾พÔิÇวàเµตÍอÃร»ปÅลÒาÂย·ท∙Òา§งµตÑัÇว ¡กÅลØุ‹‹Áม¢ขÍอ§ง¤คÍอÁม¾พÔิÇวàเµตÍอÃร
ãใ´ดµตÑัÇวËห¹นÖึ่§ง´ดŒŒÇวÂย¡กÒาÃรÃรÐะºบØุ »ปÅลÒาÂย·ท∙Òา§งäไ´ดŒŒËหÅลÒาÂยµตÑัÇว
µตÓำáแËห¹น‹‹§ง¨จÓำàเ¾พÒาÐะ ¾พÃรŒŒÍอÁม¡กÑั¹นãใ¹น¡กÒาÃรÊส‹‹§งáแµต‹‹ÅลÐะ
¤คÃรÑั้§ง

20. àเËหÁมÒาÐะ¡กÑัºบ¡กÒาÃร·ท∙Óำ
streaming áแÅลÐะ internet
television
Multicast
•àเ»ปšš¹นÅลÑั¡กÉษ³ณÐะ¢ขŒŒÍอÁมÙูÅลäไ»ปÂยÑั§ง
¡กÅลØุ‹‹Áม¢ขÍอ§ง¤คÍอÁม¾พÔิÇวàเµตÍอÃร
»ปÅลÒาÂย·ท∙Òา§งäไ´ดŒŒËหÅลÒาÂยµตÑัÇว
¾พÃรŒŒÍอÁม¡กÑั¹นãใ¹น¡กÒาÃรÊส‹‹§งáแµต‹‹ÅลÐะ
¤คÃรÑั้§ง

21. [¡กÒาÃร¡กÃรÐะ¨จÒาÂยäไ¿ฟÅล MULTIMEDIA]
•FTP (File Transfer Protocol)
•RSS
•Podcasts
•Bit-Torrent (P2P)