AirLive WT-2000R Betriebsanweisung PDF herunterladen (Seite 34)

z 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.

Parameter Description

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.

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.

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AirLive WT-2000R Betriebsanweisung Seite 34