ZyXEL Communications P-2812HNU-51c User Manual page 114

Chapter 5 Broadband
Table 13 Broadband Add/Edit: Bridge (ADSL) (continued)
LABEL
Mode
Bridge Group
ATM PVC
Configuration
VPI
VCI
Encapsulation
Mode
Service Category
Peak Cell Rate
Sustainable Cell
Rate
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DESCRIPTION
Select Bridge when your ISP provides you more than one IP address and you
want the connected computers to get individual IP address from ISP's DHCP
server directly. If you select Bridge, you cannot use routing functions, such as
QoS, Firewall, DHCP server and NAT on traffic from the selected LAN port(s).
Select the LAN/WLAN port(s) from which traffic will be forwarded to the WAN
interface directly.
Select a port from the Available LAN/WLAN Port(s) list and click Add >> to
add it to the Bridged LAN/WLAN Port(s) list.
If you want to remove a port from the Bridged LAN/WLAN Port(s) list,
select it and click Remove <<.
You cannot configure a QoS class for traffic from the LAN port which is selected
here.
VPI (Virtual Path Identifier) and VCI (Virtual Channel Identifier) define a virtual
circuit.
This section is available only when you select ADSL in the Type field to
configure an ATM layer-2 interface.
The valid range for the VPI is 0 to 255. Enter the VPI assigned to you.
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.
Select the method of multiplexing used by your ISP from the drop-down list.
Choices are:
• LLC/SNAP-BRIDGING In LCC encapsulation, bridged PDUs are
encapsulated by identifying the type of the bridged media in the SNAP
header.
• 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.
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.
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.
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.
This field is available only when you select Non Realtime VBR or Realtime
VBR.
P-2812HNU(L)-Fx Series User's Guide