Sierra Wireless DART 200, Руководство пользователя

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DART 200 CDPD Modem User’s Guide 3 CDPD Security Features
PN1197-00 Revision 1.0 01/23/98 3-3
Table 3-1. Key types (cont.)
SPK Prevents unauthorized changes to the modems operating
parameters. These include selected S-Registers as well as
modem IP Addresses. In addition, the use of selected AT
commands, including several of the security management
commands, is also controlled by this key. This key is enabled
by the
AT^P command. If entered incorrectly three times in a
row, it will become BLOCKED.
When the SPK is in the BLOCKED state, entering any SPK
through the
AT^P command causes a 30-second delay before
the BLOCKED response is returned. This delay imposes a
barrier to computer-generated attempts at finding the Master
Key value by unauthorized users.
Master Key Temporarily enables the SPK when it becomes BLOCKED
allowing the BLOCKED status to be cleared. Temporary
unblocking is performed by the
AT^P command, and the
BLOCKED status is permanently cleared by the AT^C
command. The Master Key cannot become BLOCKED.
AT
Commands The AT commands used to implement the security
management feature
(*E, \P, ^F, *U, ^P, ^C) and the default
keys are described in detail in Appendix F, DART AT
Command Set.