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DTR must be held high in 2-wire leased line operation. This is accomplished by DTE
control, wiring pin 20 of the digital interface cable high, or by selecting the option,
IGNORES DTR. If DTR is terminal controlled, loss of synchronization can be corrected by
cycling DTR. This causes the modem to initiate the 2-wire training sequence. DSR goes off
during the training procedure.
5.9.2 2-W
D
-U
IRE
IAL
Connection to the telephone network is through the DIAL jack. A standard telephone connects to the
TELSET/LEASED LINE jack.
5.10 Remote Configuration
You can also configure the modem remotely from another modem.
To start configuring the modem remotely, enter AT%T=. The remote modem is now in remote
configuration mode, and you can configure it just as you would a local modem.
If you need to put your local modem back in DTE mode, use the escape sequence (+++).
To put the remote modem back in DTE mode, use the command ATO. You can switch DTE service
between the local and remote modems as needed.
To exit remote configuration, use the command AT&T.
A
will prevent unauthorized users from reconfiguring your modem remotely. To set up a
security code
security code, use the command AT%P=<code>. The code can be any number from 0 to 99999999. For
example, to set up 12345 as the security code, enter AT%P=12345. By default the code is blank, which
means there is no security code.
Once you have set up a security code, you will have to enter remote configuration with the command
AT%T=<code>. For example, if you have set up 12345 as the security code, then use the command
AT%T=12345 to enter remote configuration.
To find the security code of your
To disable remote configuration entirely, enter AT%P=D. No one—including you—will be able to
configure your modem remotely until you enter a different security code, or eliminate security altogether
with the command AT%P=.
You can dial the modem and go directly into remote configuration by placing the AT*T command—
without the "=" but followed by the security code (if there is one)—at the end of the dial string.
5.11 Secure Operation
Secure operation provides password protection against unauthorized dial-up access. The security feature
can be enabled with AT commands when operating on a dial-up system and requires the secure modem
to be set for MNP or buffered mode.
Security may be enabled or disabled. TXD and RXD are suppressed to the host DTE before and
during security validation; all other signals (CTS, DSR, RI, etc.) operate as configured. After the
password has been validated, the modem operates like a standard V.32 unit. Security has no front-panel
operation except for the RESET SECURITY? prompt in the FACTORY OPTIONS submenu. Resetting
security clears both passwords and turns security off.
O
P
PERATION
modem, enter AT%P?.
local
NOTE
CHAPTER 5: Operation
4 5
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