Figure 14-14. Qos Configuration Page; Qos (Quality Of Service) Configuration Page - Comtech EF Data CDM-570 Installation And Operation Manual

CDM-570/570L Satellite Modem with Optional IP Module
Ethernet IP Module - CLI and Telnet Operation
14.2.4

QoS (Quality of Service) Configuration Page

Activate the QoS Configuration page from the Main Menu page.
The QoS Configuration page contains the following options/fields:
Selection
QoS Mode
QoS Rules Configuration
DiffServ Rules
Configuration
Maximum System
Latency (msecs)
Enable WAN
Segmentation and
Reassembly (SAR)

Figure 14-14. QoS Configuration page

Entry Description
M Select;
1 – Rule-Max/Pri Mode
2 – Rule-Min/Max Mode
3 – DiffServ Mode
Q Defines QoS rules for Max/Pri Mode or Min/Max Mode
D Defines QoS rules for DiffServ Mode
A Defines the maximum duration that a packet will sit in a QoS queue before
being aged out and dropped. Use this to specify the overall depth of the
QoS queues in milliseconds of traffic that is destined to go over the satellite.
Lower priority packets are dropped first until there is enough room to send
the higher priority packets.
Valid range is from 200 to 5000 milliseconds.
R Packet Segmentation and Reassembly (SAR) is enabled automatically
while QoS is enabled. However, SAR is an adaptive process; it will trigger
only if the packet latency exceeds the threshold value (default to 20 msec).
Latency value is calculated based on the satellite transmission bandwidth.
There is no minimum segment size. However, if the last segment is less
than 16 bytes, then it is appended to the previous segment excluding
satellite HDLC header in order to avoid satellite overhead and consumption
of CPU cycles.
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Revision 12
MN/CDM570L.IOM