Comtech EF Data CDM-625A User Manual
Page 269
CDM-625A Advanced Satellite Modem
MN-CDM625A
Ethernet-based Remote Product Management
Revision 3
7–39
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.
for complete details about using conditional access pages.
Click the QoS, Compression, or Encryption tab to continue.
7.5.4.3.5.1 Configuration | WAN | QoS Pages
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
menu tab:
• Max/Priority Mode or Min/Max Mode (see Figure 7-20)
• DiffServ Mode (see Figure 7-21)
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].