
4. Quick Start
AirLive WT-2000ARM User’s Manual
24
5
5.
Interface Setup
5.1 Internet
ATM VC
Parameter
Description
Virtual Circuit
VPI (Virtual Path Identifier) and VCI (Virtual Channel Identifier
define a virtual circuit.
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.
ATM QoS
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.
UBR (Unspecified Bit Rate) – Select UBR for applications that are
non-time sensitive, such as e-mail.