Chapter 8 Broadband
VMG/EMG/AM/DM/GM Series User’s Guide
196
The following table describes the fields in this screen.
Table 38 Network Setting > Broadband > Add/Edit New WAN Interface (ADSL over ATM-Bridge Mode)
LABEL DESCRIPTION
General Click this switch to enable or disable the WAN interface.
Name Enter a service name of this WAN interface. You can use up to 15 alphanumeric (0-9, a-z, A-Z)
and special characters except [ " ], [ ` ], [ ' ], [ < ], [ > ], [ ^ ], [ $ ], [ | ], [ & ], or [ ; ]. Spaces are
allowed.
Type Select ADSL over ATM as the interface that you want to configure. The Zyxel Device uses the
ADSL technology for data transmission over the DSL port.
Mode In Routing mode, the Zyxel Device routes traffic between a local network and another network
such as the Internet. Choose Routing mode if you want the Zyxel Device to assign local IP
addresses to devices connected to it (DHCP) and use routing features.
In Bridge mode, the Zyxel Device broadcasts traffic to the local network from the Internet.
Choose Bridge mode if you have an existing router in your network and you don’t want to
reconfigure routing settings.
ATM PVC Configuration (These fields appear when the Type is set to ADSL over ATM.)
VPI [0-255] The valid range for the VPI is 0 to 255. Enter the VPI assigned to you.
VCI [32-65535] 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.
Encapsulation Select the method of multiplexing used by your ISP from the drop-down list box. 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 Zyxel 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.
Service
Category
Select UBR Without PCR for applications that are non-time sensitive, such as email.
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 [cells/s]
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. Enter the PCR here.
Sustainable
Cell Rate
The Sustain Cell Rate (SCR) sets the average cell rate (long-term) that can be transmitted. Enter
the SCR, which must be less than the PCR. Note that system default is 0 cells/sec.
Maximum
Burst Size
[cells]
Maximum Burst Size (MBS) refers to the maximum number of cells that can be sent at the peak
rate. Enter the MBS, which is less than 65535.
VLAN
Click this switch to enable or disable VLAN on this WAN interface.
802.1p IEEE 802.1p defines up to 8 separate traffic types by inserting a tag into a MAC-layer frame that
contains bits to define class of service.
Select the IEEE 802.1p priority level (from 0 to 7) to add to traffic through this connection. The
greater the number, the higher the priority level.
802.1q Enter the VLAN ID number (from 0 to 4094) for traffic through this connection.
MTU
MTU Enter the MTU (Maximum Transfer Unit) size for this traffic.
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