User manual

Virtual Circuit ID: VPI and VCI define a virtual circuit.

VPI: The valid range for the VPI is 0 to 255

VCI: The valid range for the VCI is 32 to 65535

ATM QoS Type: Select CBR to specify fixed (always-on) bandwidth for voice or

data traffic. Select UBR for applications that are non-time sensitive, such as e-mail.

Select VBR for burst traffic and bandwidth sharing with other applications.

Cell Rate: Cell rate configuration often helps eliminate traffic congestion that slows

transmission of real time data such as audio and video connections.

Peak Cell Rate: Divide the DSL line rate (bps) by 424 (the size of an ATM cell) to find

the Peak Cell Rate (PCR).

Sustain Cell Rate: The Sustain Cell Rate (SCR) sets the average cell rate (long-term)

that can be transmitted.

Maximum Burst Size: Maximum Burst Size (MBS) refers to the maximum number of

cells that can be sent at the peak rate.

Service Name: Type the name of your PPPoE service here

User Name: Enter the user name exactly as your ISP assigned.

Password: Enter the password provide by your ISP.

Connection: The schedule rule(s) have priority over your Connection settings.

Nailed-Up Connection: Select Nailed-Up Connection when you want your connection

up all the time.

Connect on Demand: Select Connect on Demand when you don't want the connection

up all the time and specify an idle time-out in the Max Idle Timeout field

Max Idle Timeout: Specify an idle time-out in the Max Idle Timeout field

TCP MSS Option: This will increase the current MSS limit to the number specified,

hence the tweak test will report Max Packet Size as the specified number plus 40*.

4.2.5 NAT

NAT (Network Address Translation - NAT, RFC 1631) is the translation of the IP

address of a host in a packet.