User manual

CN8000 User Manual
54
OOBC
In case the CN8000 cannot be accessed with the usual LAN-based methods, it
can be accessed with an external modem via the switch’s RS-232 port. To
enable support for PPP (modem) operation, click to put a checkmark in the
Enable Out of Band Access checkbox.
Note: Enabling out of band access automatically enables Dial In operation.
See PPP Modem Operation, page 169, for set up and operation details.
When you enable out of band access, the Enable Dial Back, and Enable Dial
Out functions become available, as described in the sections that follow.
Enable Dial Back
As an added security feature, if this function is enabled, the switch disconnects
the connections that dial in to it, and dials back to one of the entries specified
in the table below.
An explanation of the dial back options is given in the table below:
Item Action
Enable Fixed
Number DialBack
If this radio button is selected, the switch will dial back to the
modem whose phone number is specified here to initiate a PPP
session with the user. For the Phone Number field, key in the
phone number that the user wants the CN8000 to call back to.
Note: You need to specify a number here even if you intend to
use flexible dial back.
Enable Flexible Dial
Back
(Use username as
dial back phone
number)
For flexibility and convenience, if this radio button is selected
the modem that the CN8000 dials back to doesn’t have to be
fixed. It can dial back to any modem that is convenient for the
user. To do so, when you dial in to the CN8000:
 When logging in, use the phone number of the modem that
you want the switch to dial back to for your Username.
 Use the phone number specified in the Phone Number field
(above) for your Password.