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MPEG-2 over IP/ATM

MPEG-2 and IP Over ATM

VBrick Systems, Inc.

MPEG-2 over ATM Structure

MPEG-2 over IP/ATM

Introduction ATM has well-known capabilities for the delivery of real-time data, but it

has not been widely deployed in enterprise networks, except as a

backbone networking technology. In carrier networks, ATM is the

technology of choice for the delivery of multiple services due to its ability

to deliver Quality of Service and high-bandwidth profile.

Many years ago the networking industry debated the advantages of ATM

vs. IP. Those debates were settled with the explosion of the Internet,

and IP became the de facto network protocol. Today, the most common

use of ATM is to transport IP traffic

∗

. In fact, it is estimated that some

80% of all Internet traffic is actually carried over ATM, and most DSL

service is delivering IP over ATM (although the ATM layer is as invisible

to the user as SONET, SDH, and other higher layer transport

mechanisms).

DVD-quality MPEG-2 video can be easily and seamlessly delivered over

ATM networks using IP, and this paper explains the basics.

MPEG over ATM There are standards that describe MPEG-2 over ATM. In fact, the very

architecture of MPEG-2 was guided by ATM’s 53-byte (48-byte payload)

cell structure. MPEG-2 Transport Streams are delivered in 188-byte

sections which fit precisely into ATM’s AAL-5 layer. These standards are

promoted by the ATM Forum, DAVIC, and were adopted by early MPEG-

over ATM

systems.

The main

advantage

of direct

MPEG-to-

ATM

mapping is

that it takes

advantage

of ATM’s

ability to

deliver

Quality of Service in order to deliver very robust performance. The

disadvantage is that there is no IP layer, and therefore deployment

requires a complete end-to-end ATM solution.

Such a solution is fine for homogeneous ATM networks, but it eliminates

the possibility of delivering that video to Ethernet-connected devices

such as PC’s or other IP-connected devices.

∗

Historical Note: IP and ATM were contending for network dominance circa 1995. While some may think ATM lost the battle for

market acceptance, it turns out that ATM is still growing and IP may be the best thing that happened to ATM!

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Inhaltsverzeichnis

Seite 1 - MPEG-2 over IP/ATM

MPEG-2 over IP/ATMMPEG-2 and IP Over ATMVBrick Systems, Inc.MPEG-2 over ATM StructureMPEG-2 over IP/ATMIntroduction ATM has well-known capabilities fo

Seite 2

MPEG-2 over IP/ATMMPEG-2 and IP Over ATMVBrick Systems, Inc.MPEG over MPEG-2 video that is formatted for delivery over UDP/IP can takeIP/ATM advantage

Seite 3 - ATM Edge

MPEG-2 over IP/ATMMPEG-2 and IP Over ATMVBrick Systems, Inc. EthernetEthernetVBrickVBrickStreamPlayerIIStreamPlayerII(MPEG-2)(MPEG-2)ATMATM VBric

Seite 4 - Head End

MPEG-2 over IP/ATMMPEG-2 and IP Over ATMVBrick Systems, Inc.VPIVCIMuxVPIVPIVCIVCIMuxMuxRFC1577RFCRFC15771577MPEGEncoder/DecoderMPEGMPEGEncoder/Decoder

Seite 5

MPEG-2 over IP/ATMMPEG-2 and IP Over ATMVBrick Systems, Inc.ATM Advantages ATM, and IPoA has several important advantages. First, ATM networksare wid

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