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4.2.1 ATM VC & QoS
Asynchronous transfer mode (ATM) is a protocol that arranges data into small,
uniform-sized cells with VCI data, as opposed to variable-sized data packets. ATM settings are
used to connect to your ISP. Your ISP provides your VPI and VCI setting information. You can
configure up to 8 virtual circuits (VC), each using different encapsulations, if you apply for 8
different VCs from your ISP. You must activate each VC for it to take effect. For permanent
virtual circuit (PVC) management, you can use ATM Quality of Service (QoS) to set up each
PVC traffic line's priority.
The following table describes the labels in this screen.
LABEL
Virtual Circuit
Status
VPI
VCI
ATM QoS
PCR
SCR
MBS
The PVCs Summary button opens a new window that displays the current PVC settings.
Peak Cell Rate (PCR) is the maximum rate at which the sender can send cells. This
parameter may be lower (but not higher) than the maximum line speed. 1 ATM cell is 53 bytes
(424 bits), so a maximum speed of 832 Kbps gives a maximum PCR of 1962 cells/sec. This
rate is not guaranteed because it is dependent on the line speed.
Proprietary & Confidential
Revision: V1.0
Select the PVC you wish to modify.
Each PCV can be toggled Activated or Deactivate.
Enter your VPI number here.
Enter your VCI number here.
Select the QoS type for the PVC in question from the dropdown list.
Enter the PCR here. For all QoS types.
Enter the SCR here. Only for rtVBR and nrtVBR.
Enter the MBS here. Only for rtVBR and nrtVBR.
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DESCRIPTION
Apr. 23, 2008
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