iPECS SBG-1000 User Manual

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iPECS SBG-1000 User Manual (DATA Features) Figure 5.59 Add Device Traffic Shaping If you would like to configure iPECS SBG-1000’s LAN traffic transmission/reception rate, select the relevant LAN device. If you would like to apply the settings on all LAN devices, select the ‘Default LAN Device’ entry 4. Click ‘OK’. The ‘Edit Device Traffic Shaping’ screen appears. Figure 5.60 Edit Device Traffic Shaping 5. Configure the following fields: Tx Bandwidth This parameter limits the gateway’s bandwidth transmission rate. The purpose is to limit the bandwidth of the WAN device to that of the weakest outbound link, for instance, the DSL speed provided by the ISP. This forces iPECS SBG-1000 to be the network bottleneck, where sophisticated QoS prioritization can be performed. If the device’s bandwidth is not limited correctly, the bottleneck will be in an unknown router or modem on the network path, rendering iPECS SBG-1000’s QoS useless. TCP Serialization You can enable TCP Serialization in its drop-down menu, either for active voice calls only or for all traffic. The screen will refresh, adding a ‘Maximum Delay’ field (see Figure 5.61). This function allows you to define the maximal allowed transmission time frame (in milliseconds) of a single packet. Any packet that requires a longer time to be transmitted will be fragmented to smaller sections. This avoids transmission of large, bursty packets that 78
iPECS SBG-1000 User Manual (DATA Features) may cause delay or jitter for real-time traffic such as VoIP. If you insert a delay value in milliseconds, the delay in number of bytes will be automatically updated on refresh. Figure 5.61 TCP Serialization – Maximum Delay Queue Policy Tx traffic queueing can be based on a traffic class (see the following explanations) or on the pre-defined priority levels (refer to Section 5.3.3). Note that when it is based on a traffic class, the class’s bandwidth requirements will be met regardless of the priority, and only excess bandwidth will be given to traffic with a higher priority. However, when unlimited bandwidth is selected for the Tx traffic, the queue policy can only be based on the pre-defined priority levels. 5.3.4.2 Creating a Traffic Shaping Class The bandwidth of a device can be divided in order to reserve constant portions of bandwidth to predefined traffic types. Such a portion is known as a Traffic Shaping Class. When not used by its predefined traffic type, or owner (for example VoIP), the bandwidth will be available to all other traffic. However when needed, the entire class is reserved solely for its owner. Moreover, you can limit the maximum bandwidth that a class can use even if the entire bandwidth is available. When a traffic class is first defined for a specific traffic type, two classes are created. The second class is the ‘Default Class’, which is responsible for all the packets that do not match the defined traffic class, or any other classes that may be defined on the device. You can also define wildcard devices, such as all WAN devices. This can be viewed in the ‘Class Statistics’ screen (see Figure 5.71). To define a new traffic shaping class, perform the following: 1. In the ‘Edit Device Traffic Shaping’ screen (see Figure 5.60), click the ‘New Entry’ link in the ‘Tx Traffic Shaping’ section. The ‘Add Shaping Class’ screen appears. Figure 5.62 Add Shaping Class 2. Name the new class and click ‘OK’ to save the settings, e.g. Class A. 3. Back in the ‘Edit Device Traffic Shaping’ screen, click the class name to edit the traffic class. Alternatively, click its action icon. The ‘Edit Shaping Class’ screen appears. 79
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iPECS SBG-1000 User Manual

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