Installation guide

16
• Idle Timeout
• Host Trigger
• Valid Rx
Default Gateway: If checked, this WAN connection acts as the default gateway to the
Internet.
Enforce MTU: This feature is enabled by default. It forces all TCP traffic to conform
with PPP MTU by changing TCP maximum segment size to PPP MTU. If it is
disabled, you may have issues accessing some Internet sites.
Debug: Enables PPPoE connection debugging facilities. This option is used by ISP
technical support and ODM/OEM testers to simulate packets going through the
network from the WAN side.
PPP Unnumbered: PPP Unnumbered is a special feature. It enables the ISP to
designate a block of public IP addresses to the customer where it is statically
assigned on the LAN side. PPP Unnumbered is, in essence, like a bridged
connection.
LAN: The LAN field is associated with the PPP Unnumbered field and is enabled
when the PPP Unnumbered field is checked. You can specify the LAN group the
packets need to go to when the PPP Unnumbered feature is activated.
PVC: Permanent virtual circuit. This is a fixed virtual circuit between two users. It is
the public data network equivalent of a leased line. No call setup or clearing
procedures are needed.
VPI: If instructed to change this, type in the VPI value for the initial connection (using
PVC 0). Default = 0.
VCI: If instructed to change this, type in the VCI value for the initial connection (using
PVC 0). Default = 0.
QoS: Quality of Service 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 VBR (Variable
Bit Rate) for burst traffic and bandwidth sharing with other applications.
PCR: 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.
SCR: The Sustain Cell Rate (SCR) sets the average cell rate (long-term) that can be
transmitted.
MBS: Maximum burst size, a traffic parameter that specifies the maximum number of
cells that can be transmitted at the Peak Cell Rate.
CDVT: Cell delay variation tolerance, the maximum amount of cell delay variation that
can be accommodated. Cell delay variation measures the random inter-arrival
times of cells within an ATM connection due to cell transfer delay caused by
buffering, multiplexing, and so on.
Auto PVC: Auto-Sensing permanent virtual circuit. The overall operation of the