R21xx-HP FlexFabric 11900 Fundamentals Configuration Guide

To work with the SSH server, you might need to configure the SSH client. For information about

configuring the SSH client, see Security Configuration Guide.

Logging in through a pair of modems

You can use a pair of modems to remotely connect to the console port of the device over PSTN when the

IP network connection is broken.

Figure 14 Connecting to the device through modems

By default, modem dial-in is enabled and requires a password, but no password is configured. To use

modem dial-in, you must log in to the device through any other method and configure modem dial-in first.

For the configuration procedure, see "Logging in through the console port locally."

To use a pair of modems to remotely log in to the device:

1. Connect one modem to the serial port of the PC and another modem to the console port of the

device.

2. Connect each modem to the PSTN through a telephone cable.

3. Obtain the telephone number of the device-side modem.

Figure 15 Connecting the PC to the device through modems

4. Configure the following settings on the device-side modem:

{ AT&F—Restores the factory default.

{ ATS0=1—Configures auto-answer on first ring.

{ AT&D—Ignores DTR signals.

{ AT&K0—Disables local flow control.

{ AT&R1—Ignores RTS signals

{ AT&S0—Forces DSR to remain on.

{ ATEQ1&W—Disables the modem from returning command responses and execution results,

and saves configuration.

To verify your configuration, enter AT&V to display the configuration results.

NOTE:

The configuration commands and output vary by modem. For more information, see the modem user

guide.

5. To ensure successful communication and to avoid data loss, verify that the console port uses the

default parity check, stop bits, and data bits settings, and has a baud rate that is lower than the

transmission rate of the modem.