MPEG-2 over IP/ATM
MPEG-2 and IP Over ATM
VBrick Systems, Inc.
VPI
VCI
Mux
VPI
VPI
VCI
VCI
Mux
Mux
RFC
1577
RFC
RFC
1577
1577
MPEG
Encoder/Decoder
MPEG
MPEG
Encoder/Decoder
Encoder/Decoder
MPEG
Encoder/Decoder
MPEG
MPEG
Encoder/Decoder
Encoder/Decoder
Ethernet User
Data Port
Ethernet User
Ethernet User
Data Port
Data Port
IP Router
Function
IP Router
IP Router
Function
Function
ATM
AAL-5
ATM
ATM
AAL-5
AAL-5
ATM
OC-3c
ATM
ATM
OC-3c
OC-3c
Head End
ATM
DSLAM
DSLAM
Service providers, cable
operators, and content
aggregators benefit from IP over
ATM because, at some point
along the delivery chain, the
network infrastructure will
presuppose IP. Some Digital
Subscriber Line Access
Multiplexes (DSLAM) accept ATM, making it possible to provide higher
density Head End solutions with fewer inside ports while maintaining the
QoS necessary for premium content delivery.
Architecture The VBrick IPoA facility takes advantage of VBrick’s integral IP routing
function. This function exchanges RIP tables with other routers, making
it virtually transparent to the user and enabling seamless IP connectivity
where each ‘port’ of the router may be a unique IP network.
The block diagram illustrates how the IPoA works.
Each MPEG encoder or decoder may be configured with a different IP
address, and a routing facility can direct that traffic to an appropriate
ATM VPI/VCI where the IPoA and AAL-5 encapsulation occurs.
Similarly, the local Ethernet Data Port supports native IP data, allowing
high-speed access to the Internet and other common network resources.
The ATM Virtual
Circuits are
delivered over the
ATM OC3c
interface.
VBrick Video
Network
Appliances can
be configured
with multiple
address
assignments, to
concentrate IP traffic across the ATM network. The VBrick internal
routing function automatically knows which ATM interface is most
appropriate to use based upon routing knowledge leaned through the
RIP processing. VBrick can seamlessly convert between Ethernet and
ATM IP layers, and automatically extract video and management IP
packets. The local Ethernet interface port may be used as an data
access port, such that IP data presented to it is automatically routed to a
particular ATM PVC.
Importantly, VBrick allows the MPEG-2 video to be delivered on any valid
ATM Virtual Circuit, and allows the same or different ATM Virtual Circuits
to be used for various combinations of video or data sources. For
example, you might use:
• one VC for receiving and a different VC for sending
• one VC for encoder #1 and a different VC for encoder #2
• one VC for all video
• one VC for Ethernet User Data and a different one VC for video
(8 Seiten)
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