DSL-2740B Wireless ADSL Router User Guide
ADSL Settings Window
Additional information for you to help you configure your WAN connections:
ATM Settings:
The ATM settings in the ADSL Settings windows for the different connection types can be used to adjust QoS parameters for ADSL clients. This may not be available to all ADSL accounts.
ATM Parameters |
| Description |
| The Router supports using up to eight multiple virtual connections. This | |
| window allows the user to configure WAN settings for all the available | |
PVC | connections (see instructions below on how to set up Multiple Virtual | |
Connections). Use the PVC | ||
| to Pvc7) you want to configure. Since most users will use only a single | |
| connection, the default setting Pvc0 can be used for any changes made to | |
| the WAN settings. | |
VPI
VCI
Virtual Circuit
Service Category
The Virtual Path Identifier is used with the VCI to define a dedicated circuit on the ATM network portion of the connection to the Internet and WAN. Most users will not need to change this setting.
The Virtual Channel Identifier is used with the VPI to define a dedicated circuit on the ATM network portion of the connection to the Internet and WAN. Most users will not need to change this setting.
As with the PVC setting, this is mainly for use by clients who are configuring the Router for multiple virtual connections. Use this to enable or disable the PVC you are currently configuring. By default, the Pvc0 is Enabled and the remaining PVCs are disabled.
The ATM settings allow the user to adjust ATM Quality of Service (QoS) or traffic parameters to suit specific traffic requirements. For applications or circumstances where packet loss or packet delay is a concern, ATM QoS can be adjusted to minimize problems. For most accounts, it will not be necessary to change these settings. Altering QoS settings can adversely affect performance of some commonly used Internet applications.
If you plan to change QoS or traffic parameters, contact your ISP or network services provider for information on what types of adjustment are available or possible for your account. Your ISP may not support the class of service you want to use.
To adjust ATM QoS parameters, select one of the Service Categories listed here and type in the PCR value in the entry field below. For the VBR service category, an additional parameter (SCR) must also be defined.
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
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