User's Manual

38
VPI -- Virtual Path Identifier. This is read-only field and is selected on the Select column in
the Current ATM VC Table.
VCI -- 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.
QoS -- 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.
PCR
-- Peak Cell Rate, measured in cells/sec., is the cell rate which the source may never
exceed.
SCR
-- Sustained Cell Rate, measured in cells/sec., is the average cell rate over the duration
of the connection.