NetModule NB3000-Line-Hd User Manual page 50

In general, a link will be only dialed or declared as up if the following prerequisites are met:
Condition
Modem is registered
Registered with valid service type
Valid SIM state
Su cient signal strength
Client is associated
Client is authenticated
Valid DHCP address retrieved
Link is up and holds address
Ping check succeeded
The menu can be used further to prioritize your WAN links. The highest priority link which
has been established successfully will become the so-called hotlink which holds the default
route for outgoing packets.
In case a link goes down, the system will automatically switch over to the next link in the
priority list. You can con gure each link to be either established when the switch occurs or
permanently in order to minimize link downtime.
Parameter
1st priority
2nd priority
3rd priority
4th priority
Links are being triggered periodically and put to sleep in case it was not possible to establish
them within a certain amount of time. Hence it might happen that permanent links will
be dialed in background and replace links with lower priority again as soon as they got
established. In case of interfering links sharing the same resources (for instance in dual-SIM
operation) you may de ne a switch-back interval after which an active hotlink is forced to go
down in order to let the higher-prio link getting dialed again.
We recommend to use the permanent operation mode for WAN links in general. However, in
case of time-limited mobile tariffs for instance, the switchover mode might be applicable.
By using the distributed mode, it is possible to distribute outgoing tra c over multiple
WAN links based on their weight ratio.
NB3000-Line-Hd User Manual 4.2
WWAN
X
X
X
X
X
X
X
WAN Link Priorities
The primary link which will be used whenever possible.
The rst fallback link, it can be enabled permanently or being
dialed as soon as Link 1 goes down.
The second fallback link, it can be enabled permanently or be-
ing dialed as soon as Link 2 goes down.
The third fallback link, it can be enabled permanently or being
dialed as soon as Link 3 goes down.
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WLAN ETH PPPoE
X
X
X
X X X
X X X
X X X