Web interface wizards
Digi TransPort User Guide 108
SureLink wizard
This wizard configures your Digi TransPort router to stay connected to the W-WAN (Wireless Wide
Area Network) under adverse conditions, using several features designed to recover from
network and other problems. The wizard helps you choose the most appropriate set of features
for you. Please read the following explanation carefully as it is important that you make the
correct selection for your circumstances.
Automatic power cycling of the internal Wireless WAN radio will occur if ever the PPP link to the
network cannot be established. In the event of a problem occurring when the PPP link is already
up, some mechanism must be employed to detect the dead link and deactivate it. This wizard
will help you configure the most appropriate dead link detection technique.
There are two types of dead link detection techniques: passive and active.
Passive techniques
Passive techniques work by monitoring data that would be sent over the W-WAN network
anyway. As it is necessary for data to be sent in order to detect a problem, these techniques are
only suitable if the equipment on the router's LAN (Local Area Network) regularly sends data over
the W-WAN.
The main advantage of passive techniques are:
• No additional data charges (if your mobile operator charges you for data).
• In a hub and spoke deployment, no additional load will be placed on equipment at the hub.
The main disadvantages are:
• If the equipment on the LAN does not send data and a problem with the connection
manifests, it will not be possible to connect to the router or the router's LAN remotely until
the equipment on the LAN sends data.
• As equipment on the LAN needs to send data before some problems can be detected, if a
problem does occur, the equipment on the LAN will be subject to delays when it first tries to
send data. This is because it will take the Digi TransPort router a certain amount of time to
detect and recover from the network problem.
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