AirLive WT-2000ARM - Manual (Page 30)

AirLive WT-2000ARM User’s Manual
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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.
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.
PCR Divide the DSL line rate (bps) by 424 (the size of an ATM cell) to find
the PCR (Peak Cell Rate). This is the maximum rate at which the
sender can send cells.
SCR SCR (Sustain Cell Rate) is the average rate, as measured over a
long interval, in the order of the connection lifetime.
Parameter Description
MBS MBS (Maximum Burst Size) refers to the maximum number of cells
that can be sent at the peak rate. Type the MBS, which is less than
65535.