Chapter 8 Broadband
AX/DX/EX/PX Series User’s Guide
231
8.6 Backup WAN
Use this screen to have the LAN/WAN port on the Zyxel Device ports panel to act as an Ethernet WAN
port. The Ethernet WAN connection has priority over the DSL WAN connection.
It’s not enough to just enable the fourth LAN port as a WAN port here. You must also go to Network
Setting > Broadband screen and create a new interface for it with the Type as Ethernet and
Encapsulation as IPoE. It’s suggested to enable NAT.
Note: The Ethernet WAN connection has priority over the DSL connection. See Section 1.2.1
on page 22 for the Zyxel Device WAN priority.
Click Network Setting > Broadband > Backup WAN to display the following screen.
Annex M/J Annex M and Annex J are specified in ITU-T recommendations G.992.3 (ADSL2) and G.992.5
(ADSL2+). Annex M and Annex J enhance the capabilities of Annex A and Annex B by
increasing the upstream transmission data rate, but slightly reduce the downstream data rates
as a trade-off. Annex M supports data rates of up to 12 Mbit/s downstream and 3.5 Mbit/s
upstream for ADSL2, and up to 24 Mbit/s downstream and 2.5 Mbit/s upstream for ADSL2+.
Annex J supports data rates of up to 12 Mbit/s downstream and 3.5 Mbit/s upstream for ADSL2,
and up to 24 Mbit/s downstream and 3.5 Mbit/s upstream for ADSL2+. However, the actual
downstream/upstream data rates depend on the distance from the ISP DSLAM to the Zyxel
Device and the quality of your telephone line. Click the switch to enable the Zyxel Device to use
Annex M for Zyxel Device models that use POTS WAN connection, and use Annex J for Zyxel
Device models that use ISDN WAN connection.
VDSL2 VDSL2 (Very High Speed Digital Subscriber Line 2) is the second generation of the VDSL standard
(which is currently denoted VDSL1). VDSL2 allows a frequency band of up to 30MHz and
transmission rates of up to 100 Mbps in each direction. VDSL2 is defined in G.993.2.
VDSL Profile VDSL2 profiles differ in the width of the frequency band used to transmit the broadband signal.
Profiles that use a wider frequency band can deliver higher maximum speeds.
8a, 8b, 8c, 8d,
12a, 12b, 17a,
30a, 35b US0
The G.993.2 VDSL standard defines a wide range of profiles that can be used in different VDSL
deployment settings, such as in a central office, a street cabinet or a building.
The Zyxel Device must comply with at least one profile specified in G.993.2. but compliance with
more than one profile is allowed.
Cancel Click Cancel to return to the previous configuration.
Apply Click Apply to save your changes back to the Zyxel Device.
Table 52 Network Setting > Broadband > Advanced (continued)
LABEL DESCRIPTION
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