Atm Setting - CNET CAR-854 User Manual

5.4.2 ATM Setting

The page is for ATM PVC QoS parameters setting. The DSL device supports 4 QoS mode
— UBR / CBR / nrt-VBR / rt-VBR.
Field
VPI
VCI
QoS
PCR
SCR
MBS
Description
Virtual Path Identifier. This is read-only field and is selected on the Select column in the
Current ATM VC Table.
Virtual Channel Identifier. This is read-only field and is selected on the Select column in
the Current ATM VC Table. The VCI, together with VPI, is used to identify the next
destination of a cell as it passes through to the ATM switch.
Quality of Server, a characteristic of data transmission that measures how accurately and
how quickly a message or data is transferred from a source host to a destination host over a
network. The four QoS options are
„ UBR (Unspecified Bit Rate): When UBR is selected; the SCR and MBS fields are
disabled.
„ CBR (Constant Bit Rate): When CBR is selected; the SCR and MBS fields are
disabled.
„ nrt-VBR (non-real-time Variable Bit Rate): When nrt-VBR is selected, the SCR and
MBS fields are enabled.
„ rt-VBR (real-time Variable Bit Rate): When rt-VBR is selected, the SCR and MBS
fields are enabled.
Peak Cell Rate, measured in cells/sec., is the cell rate which the source may never exceed.
Sustained Cell Rate, measured in cells/sec., is the average cell rate over the duration of the
connection.
Maximum Burst Size, a traffic parameter that specifies the maximum number of cells that
can be transmitted at the peak cell rate.
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CAR-854 Wireless b/g ADSL 2/2+ Modem Router
User Manual