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
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.
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
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
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.
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.
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
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
Loss • Packet loss can happen for many reasons but is not a concern in most modern networks.
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 • Delay • - 20 ms or less for Toll Quality - 80 ms or less for Toll Quality - 180 ms or less for Business Quality
Network Tools that effect Converged Networks • • • Qo. S – Quality of Service Tools COS – Class of Service Marking Queuing Traffic Shaping Fragmentation
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 Co. S uses the Co. S field of an 802. 1 p/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.
Quality of Service Tools • Qo. S – Quality of Service refers to the network devices actually • Giving the tagged traffic different service levels. • Qo. S on Layer 2 - queuing • Qo. S on Layer 3 – queuing, traffic shaping, fragmentation
Bandwidth Tools • Compression – Header Compression – Silence Suppression • Codec Selection – G 729 – Most Compression loss in quality – G 711 – No Compression Best Quality
Example Network Topology
Example Campus Site
Example T 1 Site
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 Qo. S to network one step at a time and test! – Test Every possible scenario before putting into production
THANK YOU • For Further Questions: • • • Jaye Armstrong Lantana Communications Director of Data Services 817 -606 -3317 jarmstrong@lantanacom. com