ZyXEL Communications P-660HN-T1H User Manual

 Chapter 6 WAN Setup

P-660HN-T1H User’s Guide

The following table describes the labels in this screen. 

This section provides some technical background information about the topics 
covered in this chapter.

Be sure to use the encapsulation method required by your ISP. The ZyXEL Device 
supports the following methods.

Table 20   Network > WAN > More Connections: Edit: Advanced Setup

ATM QoS
ATM QoS Type

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. 

Peak Cell Rate

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.

Sustain Cell Rate

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

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. 

MTU
MTU

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.

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