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Readying Data Networks for Converged Services

Readying Data Networks for Converged Services. Presented by: Jaye Armstrong-CCIE Director of Data Services. Readying Data Networks for Converged Services. Introduction Assessing and Qualities that effect Converged Networks Network Tools that effect Converged Networks Example Network.

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Readying Data Networks for Converged Services

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  1. Readying Data Networks for Converged Services Presented by: Jaye Armstrong-CCIE Director of Data Services

  2. Readying Data Networks for Converged Services • Introduction • Assessing and Qualities that effect Converged Networks • Network Tools that effect Converged Networks • Example Network

  3. What is a Converged Network?Communications • A converged network is a network that handles two or more different applications such as Data, Voice, and Video.

  4. Convergence Requirements • Any Successful Converged Solution starts with a • Complete assessment of the current network for: • Speed and Duplex Settings of Devices • Current network applications and their priorities • Current Network devices and software revisions • Future Projects

  5. Major Areas of Influence to Successful Deployment • Every network should be mapped in detail and thoroughly assessed for the following factors: • Duplex Settings • Bandwidth • Delay • Jitter • Loss

  6. Duplex Settings • Duplex is the ability to converse in both directions at the same time. • All Telephone and Server equipment should be manually set to Full-duplex on the device and switch. • All switch ports that will have different devices plugged in should be left to auto negotiate.

  7. Bandwidth • Bandwidth is the number of bits per second that can be transmitted across a medium. • Point to Point links use the physical medium speed or clock rate of the interface to determine bandwidth. • Frame-Relay links should use the CIR (Committed Information Rate) of the link.

  8. Delay • Delay is experienced on every network from the time the packet Is first sent and when it arrives at it’s destination. • Serialization Delay • Propagation Delay • Forwarding/processing delay • Queuing Delay • Shaping Delay • Network Delay • Codec Delay • Compression Delay

  9. Jitter • Jitter is the variation in the arrival rate of packets that were sent in a uniform manner. • Jitter is unavoidable but we can keep it to a point where it does not impact the quality of the service. • Jitter is in a direct relationship with Bandwidth and Delay

  10. Loss • Packet loss can happen for many reasons but is not a concern in most modern networks.

  11. Industry Standards for Delay, Loss, and Jitter • Packet Loss - 1% or less can yield toll quality - 3% or less can provide Business communication quality - greater than 3% may be acceptable for voice • Jitter - 20ms or less for Toll Quality • Delay - 80ms or less for Toll Quality • - 180ms or less for Business Quality

  12. Network Tools that effect Converged Networks • QoS – Quality of Service Tools • COS – Class of Service Marking • Queuing • Traffic Shaping • Fragmentation

  13. Classification and Marking Tools • COS – Class of Service is the marking and classifying of packets. • Class of Service marking does no good if the devices are not configured to handle the marked traffic. • True CoS uses the CoS field of an 802.1p/Q packet or the Layer 3 DSCP value in the packet. • Other means of marking traffic is through Port numbers, IP addresses, etc through configuring access lists to identify the traffic.

  14. Quality of Service Tools • QoS – Quality of Service refers to the network devices actually • Giving the tagged traffic different service levels. • QoS on Layer 2 - queuing • QoS on Layer 3 – queuing, traffic shaping, fragmentation

  15. Bandwidth Tools • Compression • Header Compression • Silence Suppression • Codec Selection • G729 – Most Compression loss in quality • G711 – No Compression Best Quality

  16. Example Network Topology

  17. Example Campus Site

  18. Example T1 Site

  19. Steps to Success • Planning • Make Sure all requirements are documented • Document Current Network • Review requirements • Assess Network Before and After Configuration • Use a good assessment tool that injects Voice Traffic • Add QoS to network one step at a time and test! • Test Every possible scenario before putting into production

  20. THANK YOU • For Further Questions: • Jaye Armstrong • Lantana Communications • Director of Data Services • 817-606-3317 • jarmstrong@lantanacom.com

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