D-Link DSL-504T manual Service Category, Igmp Proxy

DSL-504T DSL Router User’s Guide

The ATM menu parameters are described as follows:

Parameter	Description
PVC	Select the connection to adjust QoS settings from the drop-down menu.
	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
Service Category	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.
	Sustainable Cell Rate – The SCR is defined for Variable Bit Rate service.
SCR	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).
	To allow the Router to forward IGMP packets through the WAN port. Select
IGMP Proxy	the Enabled radio button and click Apply. The IGMP Proxy is enabled or
	disabled for all connections on multiple connection accounts.

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