Black Box MD1276A, User Manual

Page: 46 / 289

Page 46
Dial Stored Phone Numbers Only Option
Option
‘ M ’ is similar to Option ‘ K ’ but restricts the modem to dialling only those numbers
listed in the stored phone number fields as set with the &Z command.
The stored numbers must then be dialed using the ATDS=X command where X is the position
of the stored number as set with the AT&Z command. New stored numbers cannot be added by
the user once the dial restriction has been enabled.
General Notes on Data Security
q
By using SuperSecure you now have
•
Ensured that the phone link between two modems is secure
•
Ensured that no other user can access either modem when #E2 is enabled
q The weak link in the system is now the cable between your modem and your computer.
•
It should be kept visible at all times to prevent wire tapping
•
The modem, computer and interconnecting cable should be physically secure to prevent
access
q
With specialised equipment, the data on the lines and the image on an screen can be read, due
to wires and video screens radiating radio frequency signals which can be picked up over a
distance. You may need advice on radio frequency screening if this concerns you.