Billion BiPAC 5210G RC User Manual page 39

ATM VC
ATM settings are used to connect to your ISP. Your ISP provides VPI, VCI settings to you. In this
Device, you can setup a total of 8 VCs on different encapsulations, if you apply 8 different virtual
circuits from your ISP. You need to activate the VC for it to take effect. For PVCs management, you
can use ATM QoS to setup each the priority of each PVC traffic line.
Virtual Circuit: VPI (Virtual Path Identifier) and VCI (Virtual Channel Identifier) defines a virtual
circuit.
PVC Summary:
VPI: The valid range for the VPI is from 0 to 255. Enter the VPI assigned to you. This field may
already be configured.
VCI: The valid range for the VCI is from 1 to 65535. Enter the VCI assigned to you. This field may
already be configured.
ATM QoS: Select the type of Quality of Service for this Virtual Circuit. The ATM QoS types include
CBR (Constant Bit Rate), rtVBR (Real Time Variable Bit Rate), nrtVBR (Non Real Time Variable Bit
Rate) and UBR (Unspecified Bit Rate). These types of QoS are all controlled by the parameters
specified below, including PCR, SCR and MBS.
Select CBR to specify fixed (always-on) bandwidth for voice or data traffic. Select UBR for applications
that are non-time sensitive, such as e-mail. Select VBR for burst traffic applications and those that
share bandwidth with other applications.
PCR: Divide the DSL line rate (bps) by 424 (the size of an ATM cell) to find the Peak Cell Rate
(PCR). This is the maximum rate at which the sender can send the cells.
SCR: The Sustain Cell Rate (SCR) sets the average cell rate (long-term) that can be transmitted.
MBS: Maximum Burst Size (MBS) refers to the maximum number of cells that can be sent at the
peak rate. Type the MBS, which is less than 65535.
Encapsulation
ISP: Select the encapsulation type your ISP uses from the Encapsulation list. Choices vary depending
on what you select in the Mode field.
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