User guide

030-300564 Rev A 90 August 2009
User Guide ProLine G90
(
Models 6100
,
6110
)
13.4.5 QoS
The following screen will appear if you select Advanced > WAN > QoS from the main menu. The QoS (Quality of
Service) feature helps ensure data integrity in high-speed transmissions. QoS provides the capability to partition
network traffic into multiple priority levels or classes of service. After packet classification, other QoS features can
be utilized to assign the appropriate traffic handling policies, including congestion management, bandwidth
allocation, and delay bounds for each traffic class. Modifying parameters identified on this screen can cause severe
disruption of your service. It is recommended that nothing be changed on these screens unless explicitly instructed
by your ISP. If you change the settings in this screen, click apply and then OK. If you click reset or Cancel, the
screen will return to its previous settings.
Enable QOS Services Click this check box to enable or disable QOS Services. By default, Enable QOS
Services is enabled (checked).
WAN Upstream Rate Displays the effective WAN upstream rate in kbps (kilobits per second). This value is
used to calculate Bandwidth Restrictions. The valid range is between 100 (100 kbps)
and 100000 (100 mbps). Leave blank to use the automatically determined rate.
Turbo TCP Enabled Click this check box to enable or disable Turbo TCP. By default, Turbo TCP
Enabled is disabled (unchecked).
IP Fragmentation Enabled Click this check box to enable or disable IP Fragmentation. IP Fragmentation
fragments (breaks apart) large, fragmentable, low-priority packets to reduce latency
for higher-priority traffic. For large, non-fragmentable, low-priority packets, the
modem sends back an ICMP message specifying the fragment size as the link MTU.
When enabled, and packets larger than 1500 bytes total are received by the modem,
these packets will be fragmented. By default, IP Fragmentation Enabled is disabled
(unchecked).