Configuration | Wan; Configuration | Wan | Qos Pages - Comtech EF Data CDM-625A Installation And Operation Manual

Advanced satellite modem (18 kbps – 25 mbps)

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CDM-625A Advanced Satellite Modem

Ethernet-based Remote Product Management

7.5.4.3.5 Configuration | WAN Pages

The nested QoS, Compression, and Encryption pages are accessible only to Admin

users and when you install and enable the optional IP Packet Processor card. See

Sect. 7.5.3.1 for complete details about using conditional access pages.

Click the QoS, Compression, or Encryption tab to continue.

The 'Configuration | WAN | QoS' page is viewable only when QoS is enabled for operation.

When you disable QoS and you select the nested QoS tab, in place of a 'populated' page the

following message appears:

When you enable QoS, the appearance of this page depends on the active mode of QoS

operation. The active mode appears at the upper left-hand page corner, below the nested QoS

Max/Priority Mode or Min/Max Mode (see Figure 7-21)

DiffServ Mode (see Figure 7-22)

A navigation prompt also displays after the QoS mode label as follows:

Note that IP is a hyperlink that provides direct navigation to this configuration page.

Segmentation and Reassembly (SAR)

This section is identical for the "Max/Priority," "Min/Max," and "DiffServ" pages.

Packet Segmentation and Reassembly (SAR) is an adaptive process; it will trigger only if the

packet latency exceeds the threshold value (default to 25 msec). SAR is needed, when running

small-speed (<700 kbps) links, to keep latency and jitter within specifications (25 msec

latency/10 msec jitter) when the lower priority queue contains large packets.

Use the drop-down list to select SAR as Disable or Enable, and then click [Submit].

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