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Chapter 5 Broadband
ADSL Series User’s Guide
91
WAN Service Type This field is available only when you select Routing in the Mode field. Select the
method of encapsulation used by your ISP.
• PPP over Ethernet (PPPoE) - PPPoE (Point to Point Protocol over Ethernet)
provides access control and billing functionality in a manner similar to dial-up
services using PPP. Select this if you have a username and password for Internet
access.
• IP over Ethernet - In this type of Internet connection, IP packets are routed
between the Ethernet interface and the WAN interface and then formatted so that
they can be understood in a bridged environment.
• PPP over ATM - PPPoA offers standard PPP features, such as authentication,
encryption, and compression. It is used as the connection encapsulation method in
an ATM based network, and it can reduce overhead slightly compared to PPPoE.
PPPoE Passthrough In addition to the ZyXEL Device’s built-in PPPoE client, you can enable PPPoE pass
through to allow up to ten hosts on the LAN to use PPPoE client software on their
computers to connect to the ISP via the ZyXEL Device. Each host can have a separate
account and a public WAN IP address.
PPPoE pass through is an alternative to NAT for application where NAT is not
appropriate.
Disable PPPoE pass through if you do not need to allow hosts on the LAN to use PPPoE
client software on their computers to connect to the ISP.
ATM PVC Configuration - VPI (Virtual Path Identifier) and VCI (Virtual Channel Identifier) define a virtual
circuit)
VPI The valid range for the VPI is 0 to 255. Enter the VPI assigned to you.
VCI The valid range for the VCI is 32 to 65535 (0 to 31 is reserved for local management
of ATM traffic). Enter the VCI assigned to you.
DSL Link Type The DSL link type is set to EoA (Ethernet over ATM) to have an Ethernet header in the
packet, so that you can have multiple services/connections over one PVC. You can set
each connection to have its own MAC address or all connections share one MAC
address but use different VLAN IDs for different services. EoA supports IPoE, PPPoE
and RFC1483/2684 bridging encapsulation methods.
Encapsulation Mode The encapsulation method of multiplexing used by your is LLC/SNAP-BRIDGING. In
LCC encapsulation, bridged PDUs are encapsulated by identifying the type of the
bridged media in the SNAP header.
Service Category Select UBR Without PCR for applications that are non-time sensitive, such as e-mail.
Select CBR (Constant 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.
Sustainable 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.
PPP Information - This section is available only when you select Routing in the Mode field and PPPoE in the
WAN Service Type field.
Table 11 Broadband Add/Edit: Routing- PPPoE (continued)
Label
DESCRIPTION