Configure Advanced interfaces settings
Digi TransPort User Guide
290
PPP Mappings parameters
The PPP Mappings page contains two columns of as many interfaces as are supported by the
router (this varies between models). Each row in the column contains a drop-down list box that
allows the user to select what function should be associated with each PPP instance. The PPP
instance number is the left-most column. So, for example, to assign a W-WAN interface to PPP
instance 3, select
Mobile SIM1 or SIM2
from the drop-down box to the right of instance 3. If a W-
WAN interface is fitted to the router, this is the default mapping.
Multilink PPP parameters
As mentioned above, the routers may support multilink PPP. This section describes the
configuration of MLPP functionality.
The PPP interface must be configured with
Always On
mode enabled and an AODI NUA.
Desired local ACCM c
The Asynchronous Control Character Map (ACCM). The default value of
0x00000000
should
work in most cases. Changing this value is for advanced users only.
Desired remote ACCM c
The ACCM for the remote peer. As above, the default value of
0xffffffff
should work in most
cases and should only be changed if it is known that other characters should be used.
Username
The username used for logging on to the remote system.
Password
The password used for authentication with the remote system when using MLPP. This
password is used for both B-channel PPP connections.
Confirm password
When changing the password, type the new password into this text box. The router checks
that both fields are the same before changing the value.
Enable remote CHAP authentication
When enabled, causes the router to authenticate itself with the remote system using CHAP. If
this parameter is set, the connection will fail if authentication fails. Generally, this checkbox
should be left unchecked.
Enable short sequence numbers
When enabled, enables the use of 12-bit data packet sequence numbers, rather than the
more usual 16-bit data packet sequence numbers.
Bring up the second ISDN B-channel
Never
When selected, causes the router not to activate the second B-channel.
When the data rate is greater than n bytes/sec for s seconds
When selected, the two associated text boxes become enabled and allow the user to enter the
desired data rate (default
2000
bytes/second) that will trigger activation of the second B-
channel and the period for which the data rate exceeds that value, before the channel is
activated.
