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Ethernet Interface Operation
CDM-760 Advanced High-Speed Trunking Modem
7.4.4.3.5
Configuration | WAN Pages
1) The nested QoS and Compression pages are accessible only to Admin users
when the optional High-Speed Packet Processor card is installed and enabled.
See Sect. 7.4.3.1 for information about using conditional access pages.
2) The Encryption page is non-functional in this firmware release.
Click the WAN primary page tab, and then select the QoS or Header Compression tab to
continue.
7.4.4.3.5.1
Configuration | WAN | QoS Page
Use the QoS Mode drop-down list to select Off, Max/Priority, Min Max, or DiffServ:
•
When you use the QoS Mode drop-down list to select Off, and then click [Submit], QoS is
disabled. In place of a 'populated' page, the page appears as follows:
•
When you enable QoS with any mode other than Off and click [Submit], the appearance of
this page changes depending on the active QoS Mode:
o Max/Priority Mode or Min/Max Mode (see Figure 7-18).
o DiffServ Mode (see Figure 7-19).
SAR Feature
This function is identical for the 'Max/Priority,' 'Min/Max,' and 'DiffServ' QoS modes.
SAR (Packet Segmentation and Reassembly) is an adaptive process; it triggers only if the packet
latency exceeds the threshold value (default to 20 msec). SAR is needed, when running low-
speed (<700 kbps) links, to keep latency and jitter within specifications (20 msec latency/10
msec jitter) when the lower priority queue contains large-size packets.
Use the drop-down list to Disable or Enable SAR. Click [Submit] to save.
When the QoS is set to "Off" there is no traffic shaping or filtering. All data
coming into the modem will be sent to the WAN as it is received, in the order
it was received, for so long as the WAN can support the packet/frame and
data rate of the incoming traffic. If there is not enough WAN capacity to
support the incoming traffic, packets or frames are tail-dropped as they
overflow the internal buffer.
7–33
Revision 4
MN-CDM760
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