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E Connecting to a Cisco Router
95
MultiModemZBA-V-V92 User Guide
Note that command echo and result codes have been turned off. If it becomes necessary to send
additional AT commands to the modem after it has been so configured, there will be little feedback
from the modem that it has received and acted upon the command. Only commands such as ATI0
that request specific data from the modem will send any data to the DTE as an indication that the
modem has accepted the command. Temporarily turning on command echo and result codes might
ease reconfiguration of the modem.
When the modem is connected to the console port, turn the modem off and then on again. This will
set the serial baud rate to 9600 bps as the $SB9600 command is implemented.
Console Port Connections
To connect a personal computer to the console port, use the RJ-45-to-RJ-45 roll-over cable and
either the RJ-45-to-DB-25 female DTE adapter or the RJ-45-to-DB-9 female DTE adapter (labeled
“TERMINAL”).
Cable Pin-outs and Cabling Guide
Console Modem
(DTE) Console port Console cable Adapter Adapter (DCE)
signal RJ-45 pin RJ-45 pin DB-9 pin DB-25 pin signal
RTS 1 8 8 4 RTS
DTR 2 7 6 20 DTR
XMT 3 6 2 2 XMT
GND 4 5 5 7 GND
GND 5 4 5 7 GND
RCV 6 3 3 3 RCV
DSR 7 2 4 6 DSR
CTS 8 1 7 5 CTS
Remote Configuration
The configuration of the modem described in Step 3 contains the core settings that allow the modem
to function properly on the console port of the Cisco router. Commands in this section may be done
remotely by calling into the MT5634ZBA-V92 attached to the console port with another modem.
Note: Setting country configuration and turning on callback security cannot be done remotely. Nor
can all commands be executed remotely if the remote modem is set for callback security; remote
configuration of a modem so configured is not recommended.
1. Establish a data connection with a remote MT5634ZBA-V92 modem.
2. Send three remote configuration escape characters followed by AT and the setup password, and
then press ENTER. Example: %%%ATMTSMODEM. You have four tries to enter the correct
password before being disconnected. If the password is correct, the remote modem may respond
with OK.
Note: If the modem has previously been configured with command echo off and result codes off,
it may be difficult to determine if the remote modem is responding to commands. The ATI
command can be used for this purpose. Even with echo and result codes off, the modem will
respond with the requested ID string if it is properly receiving the command.
3. You can now send AT commands to configure the remote modem.