Next Generation Networks Chapter 10
Knowledge Concepts <ul><li>QoS concepts </li></ul><ul><li>Bandwidth needs for Internet traffic </li></ul>
Important Terms <ul><li>QoS </li></ul><ul><li>Streaming video </li></ul><ul><li>Compression </li></ul><ul><li>MPEG </li></...
Bandwidth and Expansion <ul><li>Internet traffic doubles every 11 months </li></ul><ul><li>Traffic increases due to changi...
Broadband Requirements <ul><li>High speed and capacity </li></ul><ul><ul><li>From terabits to petabits! </li></ul></ul><ul...
IP Networks <ul><li>Traditional routers not designed to handle high-speed/large scale network traffic </li></ul><ul><li>De...
ATM  <ul><li>Provides for real-time traffic management </li></ul><ul><li>Enables CoS and QoS </li></ul><ul><li>Emerging cl...
ATM Service Levels <ul><li>CBR (constant bit rate) for streaming video </li></ul><ul><li>VBR (variable bit rate) for provi...
IP QoS <ul><li>IntServ—controls end-to-end packet delays </li></ul><ul><ul><li>Bandwidth reservation technique </li></ul><...
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Chapter 10 slides

  1. 1. Next Generation Networks Chapter 10
  2. 2. Knowledge Concepts <ul><li>QoS concepts </li></ul><ul><li>Bandwidth needs for Internet traffic </li></ul>
  3. 3. Important Terms <ul><li>QoS </li></ul><ul><li>Streaming video </li></ul><ul><li>Compression </li></ul><ul><li>MPEG </li></ul><ul><li>Delay </li></ul><ul><li>Jitter </li></ul><ul><li>Latency </li></ul><ul><li>Isochronous traffic </li></ul><ul><li>IP switches </li></ul><ul><li>CoS </li></ul><ul><li>MPLS </li></ul>
  4. 4. Bandwidth and Expansion <ul><li>Internet traffic doubles every 11 months </li></ul><ul><li>Traffic increases due to changing nature of applications—more video and music with high bandwidth </li></ul><ul><li>Streaming video requires 3-7 Mbps </li></ul><ul><li>Video compression </li></ul><ul><ul><li>MPEG standards </li></ul></ul>
  5. 5. Broadband Requirements <ul><li>High speed and capacity </li></ul><ul><ul><li>From terabits to petabits! </li></ul></ul><ul><li>Bandwidth on demand </li></ul><ul><ul><li>Any time allocation </li></ul></ul><ul><li>Bandwidth reservation </li></ul><ul><ul><li>Guarantee of needed bandwidth </li></ul></ul><ul><li>Support of isochronous traffic </li></ul><ul><ul><li>Traffic with no tolerance for delay </li></ul></ul><ul><li>QoS </li></ul><ul><ul><li>Provide variable service levels </li></ul></ul>
  6. 6. IP Networks <ul><li>Traditional routers not designed to handle high-speed/large scale network traffic </li></ul><ul><li>Demand exceeds capacity of core, creates queue over-run </li></ul><ul><ul><li>Capacity over-load and lost packets </li></ul></ul><ul><ul><li>Congestion and slow response times </li></ul></ul><ul><li>Routers send traffic to shortest path not least congested </li></ul><ul><ul><li>During congestion, routers can take minutes to recalculate a new route </li></ul></ul><ul><li>IP switching improves speed </li></ul>
  7. 7. ATM <ul><li>Provides for real-time traffic management </li></ul><ul><li>Enables CoS and QoS </li></ul><ul><li>Emerging class of terabit switch routers for backbone </li></ul><ul><li>QoS accomdates priority control, cell loss and delay </li></ul><ul><ul><li>Implicit means the application chooses the required QoS </li></ul></ul><ul><ul><li>Explicit means the network manager controls the decision </li></ul></ul>
  8. 8. ATM Service Levels <ul><li>CBR (constant bit rate) for streaming video </li></ul><ul><li>VBR (variable bit rate) for providing bandwidth according to allocation policy </li></ul><ul><li>ABR (available bit rate) for service guarantees for average to peak traffic patterns </li></ul><ul><li>UBR (unspecified bit rate) provides a best effort service </li></ul>
  9. 9. IP QoS <ul><li>IntServ—controls end-to-end packet delays </li></ul><ul><ul><li>Bandwidth reservation technique </li></ul></ul><ul><ul><li>Applications request bandwidth from the host </li></ul></ul><ul><ul><li>Uses FIFO queuing </li></ul></ul><ul><li>DiffServ—packets marked to receive special treatment </li></ul><ul><ul><li>Really CoS model </li></ul></ul><ul><ul><li>Prioritizes streams and marks traffic so nodes can provide different levels of service </li></ul></ul><ul><ul><li>Evolved from IntServ </li></ul></ul>

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