ZyXEL Communications VMG3312-T20A - 6.3 The Cellular Backup Screen

Chapter 6 Broadband
VMG3312-T20A User’s Guide
83
6.3 The Cellular Backup Screen
The USB port (at the side panel of the VMG) allows you to attach a cellular dongle to wirelessly connect
to a cellular network for Internet access. You can have the VMG use the cellular WAN connection as a
backup. Disconnect the DSL and Ethernet WAN ports to use the cellular dongle as your primary WAN
connection. The VMG automatically uses a wired WAN connection when available.
Figure 31 Internet Access Application: Cellular WAN
Service
Category
Select UBR Without PCR for applications that are non-time sensitive, 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 [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.
VLAN
Active Select Enable to activate VLAN on this WAN interface. Otherwise, select Disable to deactivate.
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 Type the VLAN ID number (from 0 to 4094) for traffic through this connection.
OK Click OK to save your changes.
Cancel Click Cancel to exit this screen without saving.
Table 13 Network Setting > Broadband > Add New WAN Interface/Edit (ADSL over ATM-Bridge Mode)
(continued)
LABEL DESCRIPTION
DSL