ZyXEL Communications VMG4381-B10A User Manual page 83

Table 8 Routing Mode (continued)
LABEL DESCRIPTION
Encapsulation Select the method of multiplexing used by your ISP from the drop-down list box. Choices
Mode are:
• LLC/SNAP-BRIDGING: In LCC encapsulation, bridged PDUs are encapsulated by
identifying the type of the bridged media in the SNAP header. This is available only when
you select IPoE or PPPoE in the Select DSL Link Type field.
• VC/MUX: In VC multiplexing, each protocol is carried on a single ATM virtual circuit
(VC). To transport multiple protocols, the Device needs separate VCs. There is a binding
between a VC and the type of the network protocol carried on the VC. This reduces
payload overhead since there is no need to carry protocol information in each Protocol
Data Unit (PDU) payload.
• LLC/ENCAPSULATION: More than one protocol can be carried over the same VC. This
is available only when you select PPPoA in the Encapsulation field.
• LLC/SNAP-ROUTING: In LCC encapsulation, an IEEE 802.2 Logical Link Control (LLC)
header is prefixed to each routed PDU to identify the PDUs. The LCC header can be
followed by an IEEE 802.1a SubNetwork Attachment Point (SNAP) header. This is
available only when you select IPoA in the Encapsulation field.
Service Select UBR Without PCR or UBR With PCR for applications that are non-time sensitive,
Category such as e-mail.
Select CBR (Continuous Bit Rate) to specify fixed (always-on) bandwidth for voice or data
traffic.
Select Non Realtime VBR (non real-time Variable Bit Rate) for connections that do not
require closely controlled delay and delay variation.
Select Realtime VBR (real-time Variable Bit Rate) for applications with bursty connections
that require closely controlled delay and delay variation.
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.This
field is not available when you select UBR Without PCR.
Sustainable The Sustainable Cell Rate (SCR) sets the average cell rate (long-term) that can be
Cell Rate transmitted. Type the SCR, which must be less than the PCR. Note that system default is 0
cells/sec.
This field is available only when you select Non Realtime VBR or Realtime VBR.
Maximum Burst Maximum Burst Size (MBS) refers to the maximum number of cells that can be sent at the
Size peak rate. Type the MBS, which is less than 65535.
This field is available only when you select Non Realtime VBR or Realtime VBR.
PPP This is available only when you select PPPoE or PPPoA in the Mode field.
Information
PPP User Name Enter the user name exactly as your ISP assigned. If assigned a name in the form
user@domain where domain identifies a service name, then enter both components exactly
as given.
PPP Password Enter the password associated with the user name above.
PPP Auto Select this option if you do not want the connection to time out.
Connect
IDLE Timeout This value specifies the time in minutes that elapses before the router automatically
disconnects from the PPPoE server.
This field is not configurable if you select PPP Auto Connect.
PPPoE Service Enter the name of your PPPoE service here.
Name
Chapter 6 Broadband
VMG4381-B10A User's Guide
83