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In this section: Table of Contents maxLevel 3

The traffic management mechanisms provided by the

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are designed to ensure that high-priority, real-time voice traffic is processed before lower priority data traffic. At the same time, bandwidth not in use by voice traffic is made available so that data traffic can burst up to full line rate, making efficient use of WAN bandwidth

Panel
In this section: Table of Contents maxLevel 3

The traffic management mechanisms provided by the

Spacevars
0 product2

are designed to ensure that high-priority, real-time voice traffic is processed before lower priority data traffic. At the same time, bandwidth not in use by voice traffic is made available so that data traffic can burst up to full line rate, making efficient use of WAN bandwidth.

Traffic management mechanisms are applied to traffic in both the upstream (LAN to WAN) and downstream (WAN to LAN) direction. Each direction is independent of the other and can support different size priority queues. This is particularly useful in ADSL, where the downstream bandwidth is greater than the upstream bandwidth and it would be undesirable to limit downstream data traffic to the rate of the slower upstream link.

Classifying

High-priority voice traffic generated by endpoint devices such as IP phones and client adaptors is identified by their IP address. The user configures these addresses into a priority list using the traffic shaping features of the 

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VOS. As the

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processes packets they are marked as either high or low priority based on this configuration.

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The maximum WAN upstream bandwidth is multiplied by .85 in this formula to reduce the total bandwidth available for voice calls by 15%. This reduction is necessary because the

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automatically reserves 15% of the total WAN bandwidth for low priority data traffic so that data traffic is not starved completely. Starving data traffic completely would increase the number of retry attempts and exacerbate congestion on the link during periods of peak usage. The following table describes WAN bandwidth calculation examples. Caption

0	Table
1	WAN Bandwidth Calculation Examples

WAN Bandwidth CalculationDescription(1544*.85)/85.6 = 15.3 or 15 total voice callsThe maximum number of G.711 voice calls supported by a T1 (1.544 Kbps).(768*.85)/85.6 = 7.6 or 7 total voice callsThe maximum number of G.711 voice calls supported by a 768Kbps SDSL.(256periods of peak usage. The following table describes WAN bandwidth calculation examples.

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0 Table 1 WAN Bandwidth Calculation Examples
WAN Bandwidth Calculation Description (1544*.85)/85.6 =

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15.

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3 or

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15 total voice calls The maximum number of G.711 voice calls supported by

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a T1 (1.544 Kbps). (

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768*.85)/

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85.6 = 7.

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6 or 7 total voice calls The maximum number of G.

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711 voice calls supported by

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a 768Kbps SDSL.

Maximum Calls Allowed with Call Admission Control

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View traffic shaping stats in the following combinations:

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0 Table 1 WAN Bandwidth Calculation Examples
Type Command Extension All interfaces trafficstats N/A Per interface N/A -i intfName Per class of service N/A -q CoSName Per interface per class of service N/A -i intfName -q CoSName

For each traffic policy, the following information is displayed:

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