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The following table describes the labels in this screen.
Table 20 Network > WAN > More Connections: Edit: Advanced Setup
LABEL
ATM QoS
ATM QoS Type
Peak Cell Rate
Sustain Cell Rate
Maximum Burst Size
MTU
MTU
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6.4 WAN Technical Reference
This section provides some technical background information about the topics
covered in this chapter.
6.4.1 Encapsulation
Be sure to use the encapsulation method required by your ISP. The ZyXEL Device
supports the following methods.
P-660HN-TxA User's Guide
DESCRIPTION
Select CBR (Continuous Bit Rate) to specify fixed (always-on)
bandwidth for voice or data traffic. Select UBR (Unspecified Bit
Rate) for applications that are non-time sensitive, such as e-mail.
Select nrtVBR (Variable Bit Rate-non Real Time) or rtVBR
(Variable Bit Rate-Real Time) for bursty traffic and bandwidth
sharing with other applications.
Divide the DSL line rate (bps) by 424 (the size of an ATM cell) to
find the Peak Cell Rate (PCR). This is the maximum rate at which
the sender can send cells. Type the PCR here.
The Sustain Cell Rate (SCR) sets the average cell rate (long-term)
that can be transmitted. Type the SCR, which must be less than
the PCR. Note that system default is 0 cells/sec.
Maximum Burst Size (MBS) refers to the maximum number of
cells that can be sent at the peak rate. Type the MBS, which is
less than 65535.
The Maximum Transmission Unit (MTU) defines the size of the
largest packet allowed on an interface or connection. Enter the
MTU in this field.
For ENET ENCAP, the MTU value is 1500.
For PPPoE, the MTU value is 1492.
For PPPoA and RFC, the MTU is 65535.
Click this to return to the previous screen without saving.
Click this to save your changes.
Click this to restore your previously saved settings.
Chapter 6 WAN Setup
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