Digi TransPort WR31 User Manual page 297

Configure network interfaces
Drop the second ISDN B-channel
When the connection is terminated
When selected, the second B-channel is only deactivated when the connection is terminated.
When the data rate is less than n bytes/sec for s seconds
When selected, the above two text boxes are enabled. The value in the left-hand one specifies
the data rate below which the traffic must fall before the secondary B-channel will be
deactivated. The second box contains the time in seconds for which the data rate must be below
threshold before the second B-channel is deactivated.
Note The following parameters are for use with Always On Dynamic ISDN.
Bring up the first ISDN B-channel
When the data rate is greater than n bytes/sec for s seconds
When Always On mode is enabled, these two settings specify the data rate and duration for
which the data rate must be sustained before the B-channel is activated.
Drop the first ISDN B-channel
When the data rate is less than n bytes/sec for s seconds
When Always On mode is enabled, these two settings specify the data rate below the traffic
must fall and the duration for which it is below the threshold before the B-channel is
deactivated.
Digi TransPort WR Routers User Guide
Configure Advanced interfaces settings: External modems and PPP
297