ZyXEL Communications VMG8825-B Series, Руководство пользователя, Страница: 83 / 360

Chapter 6 Broadband
VMG8825-B Series User’s Guide
83
Figure 30 Network Setting > Broadband > Add New WAN Interface/Edit (ADSL over ATM-Bridge Mode)
The following table describes the fields on this screen.
Table 12 Network Setting > Broadband > Add New WAN Interface/Edit (ADSL over ATM-Bridge Mode)
LABEL DESCRIPTION
General
Active Select Enable or Disable to activate or deactivate the interface.
Name Enter a service name of the connection.
Type Select ADSL over ATM as the interface that you want to configure. The VMG uses the ADSL
technology for data transmission over the DSL port.
Mode 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).
ATM PVC Configuration (These fields appear when the Type is set to ADSL over ATM .)
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.
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. This is available only when you select IPoE or
PPPoE in the Encapsulation field.
• VC/MUX: In VC multiplexing, each protocol is carried on a single ATM virtual circuit (VC). To
transport multiple protocols, the VMG 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.
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. 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
[cells]
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.