Overview
All Converged Access products are based on the QoSWorks traffic management system to provide granular and accurate IP application performance guarantees. Application specific policies are enforced by a tightly integrated system of bandwidth management techniques (shown below). Many of these techniques are combined to bring precise performance guarantees to individual application sessions or flows.QosWorks: An Integrated System of Advanced Bandwidth Management Techniques
TCP Rate Shaping- Controls the receive window size advertised in a TCP acknowledgement packet
- Smoothes traffic by controlling the rate at which a host sends data on the network
- Controls the size of TCP packets entering the network
- Smaller packet sizes reduce jitter for latency sensitive VoIP applications
- Enables definition of end-to-end Quality of Service requirements
- Allows integration with end-to-end MPLS network QoS policies
- Allows precise allocation of bandwidth with priority TCP and UDP traffic
- Enables a separate queue for each flow, protecting a flow from other network traffic
- Defines the minimum bandwidth reserved for each flow
- An element in enabling call admission control
- Facilitates traffic engineering by limiting number of simultaneous VoIP calls
- Establishes how new calls are treated when the network is congested
- Ensures that delays caused by network congestion do not propagate indefinitely
- Packets arrive either on schedule, or if delayed are dropped if delay exceeds threshold
- Important for VoIP: It is better to drop the packet than receive outside of jitter range
- Sets the number of packets of a specific type to be sent back to back over the network
- Maxburst sets an upper bound on the run of packets for a particular flow
- Limits uncontrolled runs of packets that create unpredictable delay and jitter
WAN Optimised Bandwidth Efficiency
WAN bandwidth is also optimised as QoSWorks manages traffic within very tight tolerances. Utilisation can approach 95% as bandwidth is proactively managed to assure it is available when necessary and expanded whenever possible. This means bandwidth is first allocated to applications with the most demanding performance requirements. Spare bandwidth can be used by other applications to eliminate waste. Network planners no longer have to create wasteful "headroom" in the network to accommodate peak flows from important traffic. The net result is highly cost effective WAN bandwidth utilisation.Other Products in this category:
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