HP 16-port SCS

Operations 25
Configuring and using dial-in connections
You can attach an external modem to the console port for dial-in serial CLI access to the SCS. This configuration can
be used as a backup connection if the SCS is not accessible from the network. It can also be used as a primary
connection at remote sites that do not have Ethernet network capability. The modem must be Hayes compatible.
Specifying a modem initialization string
1. Issue a Server CLI command, using the Modeminit parameter to specify the modem initialization string.
server cli modeminit=“<string>”
The string must be enclosed in quotes and must include at least the command settings ATV1 and S0=1, which
cause the modem to issue verbose response strings and auto-answer the phone on the first ring. See “Server CLI
command.”
The modem initialization string is sent to the cabled modem when any of the following conditions occur:
• SCS initialization
• Detection of a transition of DSR from low to high
• Completion of a call when DCD changes from high to low
2. Upon successful modem connection, press the Enter key until the login prompt appears.
Displaying modem configuration information
Issue a Show Server CLI command.
show server cli
See “Show Server CLI command.”
Using PPP
The SCS supports remote PPP access using an auto-answer modem that answers calls and establishes the PPP protocol
with a dial-in client. You can establish Telnet or SSH connections over PPP.
PPP dial-in can be used to access a remote SCS that does not warrant a WAN link to the Ethernet interface. The PPP
dial-in can also be used to access a subnet containing remote devices in the event of a WAN link failure. In this case,
the PPP provides an alternate path to one or more remote devices.
To use PPP, configure a modem in auto-answer mode on the console port. See “Configuring and using dial-in
connections.” After the PPP connection is established, launch an application that connects to the SCS or to one of its
ports. The PPP connection is only a communications interface to the SCS.
The SCS implements a PPP server that uses Challenge Authentication Protocol (CHAP). Passwords are not accepted in
the clear on PPP connections.
Enabling a PPP server on the console port
Issue a Server PPP command with the Enable parameter.
server ppp enable localip=<local_ip> remoteip=<rem_ip> [mask=<subnet>]
Specify local and remote IP addresses to be used for the SCS and client ends of the PPP connection respectively. You
are prompted to confirm or cancel the changes.
Disabling a PPP server on the console port
Issue a Server PPP command with the Disable parameter.
server ppp disable
See “Server PPP command.”