if_modem

ALOM supports incoming serial modem communication from an external modem for remote management. To accept an incoming communication, you need to configure the modem hardware and ALOM software locally before accessing the system remotely.

A modem attached to the serial management port (SERIAL MGT) has exclusive use of the port. You may want to configure ALOM for use on an Ethernet to allow local users to connect to ALOM via Telnet. See Configuring ALOM or Configuring Your Network Manually for further information.

How to Configure the Serial Management Port to Use a Modem

Set the if_modem variable to true by doing one of the following:
- Log in to ALOM through a Telnet session and type the following:
  sc> setsc if_modem true
  SC Alert: Serial Mgt port input is disabled until a modem call is received.
- Log in to the host server, use the scadm utility, and type the following:
  # scadm set if_modem true May 19 13:59:07 wgs40-232 rmclomv: Serial Mgt port input is disabled until a modem call is received SC Alert: Serial Mgt port input is disabled until a modem call is received
Connect the modem to the serial management port (SERIAL MGT) and turn on the power to the modem.

The DTR, CTS, and AA lights illuminate.
Note: After you set the if_modem variable to true, input on the serial connection is disabled unless either the DCD signal on the serial management port goes high or the if_modem variable is set back to false. You will not be able to use the SERIAL MGT port until you connect a modem to it. However, you can use telnet to connect to ALOM through the NET MGT port.

How to Return the Serial Management Port for Use Without a Modem

Power off the modem.
Disconnect the RJ-45 modem connection from the serial management port (SERIAL MGT).
If another device was attached to the serial management port before you removed it to connect the modem, reconnect that device to the serial management port.
Set the if_modem variable to false by doing one of the following:
- Log in to ALOM through a Telnet session and type the following:
  sc> setsc if_modem false
- Log in to the host server, use the scadm utility, and type the following:
  scadm set if_modem false

Modem Configuration Troubleshooting

Issue	Solution
ALOM modem does not answer	Verify that cabling is set up correctly. See Setting Up the Hardware for additional information.
ALOM modem answers then immediately hangs up	Verify that the if_modem variable is set to true.
ALOM modem answers but connections appear dead	Type the ALOM escape character (#.) to see if you can return to the ALOM login or sc> prompt. Ensure that the serial management port speed and modem port speed are set to the same value. Try disabling data compression. On many modems, this is done by using the AT&K0 modem command.

Configuring an external modem