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 - 20ms or less for Toll Quality Delay - 80ms or less for Toll Quality - 180ms or less for Business Quality

Network Tools that effect Converged Networks QoS – 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 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.

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

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

Example Network Topology

Example Campus Site

Example T1 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 QoS 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