ZXHN H108L Wireless ADSL Router Maintenance Manual
16
Confidential and Proprietary Information of ZTE CORPORATION
different encapsulation. Each VC must be activated to take effect.
For permanent virtual circuit (PVC) management, users can use ATM
Quality of Service (Qos) to set up each PVC traffic line
’
s priority.
Table 7
presents the ATM VC and Qos parameters descriptions.
T
ABL E
7
T
HE
D
ESC RIPTION S OF
ATM
VC
&
Q
OS
P
AR AM ETER 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.
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