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DSL-504T DSL Router User’s Guide
41
The ATM menu parameters are described as follows:
Parameter Description
PVC
Select the connection to adjust QoS settings from the drop-down menu.
Service Category
UBR – Unspecified Bit Rate, this is the default category used for general-
purpose Internet traffic where normal levels of packet loss and delay are
acceptable. For some applications or for multiple connection accounts, it
may be desirable to specify the PCR.
CBR – Constant Bit Rate, usually used in circumstances where very low
packet loss and very low Cell Delay Variable (CDV) are desirable.
VBR – Variable Bit Rate, usually used when network traffic is characterized
by bursts of packets at variable intervals, and some moderate packet loss
and delay is acceptable. This category is typically used for audio and video
applications such as teleconferencing. The network must support QoS Class
2 to use VBR.
PCR
Peak Cell Rate – The PCR is inversely related to the time interval between
ATM cells. It is specified for all three service categories in Kbps.
SCR
Sustainable Cell Rate – The SCR is defined for Variable Bit Rate service.
This is the rate that can be sustained for “bursty”, on-off traffic sources. It
is a function of Maximum Burst Size (MBS) and the time interval (between
cells).
IGMP Proxy
To allow the Router to forward IGMP packets through the WAN port. Select
the Enabled radio button and click Apply. The IGMP Proxy is enabled or
disabled for all connections on multiple connection accounts.