ZXV10 W300 (V5.2) Wireless ADSL Router Maintenance Manual
Table 7 presents the ATM VC and Qos parameters descriptions.
T
A B L E
7 T
H E
D
ES C R I P T I O N S
O F
ATM VC & Q
OS
P
A R A M E T E R S
Parameter
Description
Virtual Circuit
Select the PVC to be modified
Status
Each PVC can be toggled
Activated
or
Deactivated
VPI
Enter the VPI number
VCI
Enter the VCI number
ATM Qos
Select the Qos type for the PVC from the dropdown list
PCR
Enter the PCR. For all Qos types
SCR
Enter the SCR. Only for rtVBR and nrtVBR
MBS
Enter the MBS. Only for rtVBR and nrtVBR
Definitions
PCR: Peak Cell Rate, is the maximum rate at which the sender can send
cells. This parameter may be lower (but not higher) than the maximum
line speed. One ATM cell is 53 bytes (424 bits), so a maximum speed of
832 Kbps gives a maximum PCR of 1962 cells/sec. This rate not
guaranteed because it is dependent on the line speed.
SCR: Sustained Cell Rate is the mean cell rate of a bursting, on-off traffic
source that can be sent at the peak rate, and a parameter for burst-type
traffic. SCR may not be greater than the PCR; the system default is 0
cells/sec.
MBS: Maximum Burst Size is the maximum number of cells that can be
sent at the PCR. After MBS is reached, cell rates fall below SCR until cell
rate averages to the SCR again. At this time, more cells (up to the MBS)
can be sent at the PCR again.
CBR: It is for connections that support constant rates of data transfer.
UBR: It is for connections that have variable traffic.
rtVBR: It is for connections that, while having variable traffic, require
precise timing between traffic source and destination. PCR, SCR and MBS
must all be set for rtVBR.
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