Edimax Technology AR-7267WnB - Manual (Page 19)

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 ATM VC
Parameter Description
Virtual Circuit VPI (Virtual Path Identifier) and VCI (Virtual Channel Identifier
define a virtual circuit.
Status Each PCV can be toggled Activated or Deactivated.
VPI
VPI is a virtual path determines the way an ATM cell should be
routed. The VPI is an 8-bit (in UNI) or 12-bit (in NNI) number
that is included in the header of an ATM cell. The valid range
for the VPI is 0 to 255. Enter the VPI assigned by the ISP.
VCI VCI is the label given to an ATM VC to identify it and
determine its destination. The VCI is a 16-bit number that is
included in the header of an ATM cell. The valid range for the
VCI is 32 to 65535. Enter the VCI assigned by the ISP.
 QoS
Parameter Description
ATM QoS UBR (Unspecified Bit Rate) – Select UBR for applications that
are non-time sensitive, such as e-mail.
CBR (Constant Bit Rate) – This class is used for emulating
circuit switching. The cell rate is constant with time. Select
CBR to specify fixed (always on) bandwidth for voice or data
traffic.
rtVBR (real time Variable Bit Rate) – This class is similar to
nrtVBR but is designed for applications that are sensitive to
cell-delay variation. Examples for real-time VBR are voice with
speech activity detection (SAD) and interactive compressed
video.
nrtVBR (non-real time Variable Bit Rate) – This class allows
users to send traffic at a rate that varies with time depending
on the availability of user information. Statistical multiplexing
is provided to make optimum use of network resources.
Multimedia e-mail is an example of nrtVBR.