SMC Networks SMC7004VBR V.2 - Manual (Page 30)

Navigating the Web-based Administration
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[PPPoE]
Enter the PPPoE user name and password assigned by
your Service Provider. The [Service Name] field is normally
optional, but may be required by some service providers.
The MTU (Maximum Transmission Unit) governs the maximum
size of the data packets. Leave this on the default value (1492)
unless you have a particular reason to change it.
In [Maximum Idle Time (in minutes)] enter a value to define
a maximum period of time for which the Internet connection
is maintained during inactivity. If the connection is inactive for
longer than the Maximum Idle Time, it will be dropped. Enable
the [Auto-reconnect] option to automatically re-establish the
connection when an application attempts to access the
Internet again.