UNIX服务器一般都可以配置远程拨入MODEM作为控制台， 供厂商的工程师远程登录进行系统诊断，下面以HP的L系列小型机作为例子，描述一下配置步骤。
其配置方法如下：
在控制台终端上键入“Ctrl b”可进入GSP，一般情况下在login:和password:提示处直 接回车即可。
例如：
键入“Ctrl b”后，终端显示：
Service Processor login: 此处回车
Service Processor password: 此处回车
Welcome to HP Guardian Service Processor
Unitialized Model, System Name: Prelude
用ca命令配置远程拨入MODEM:
GSP> ca
This command allows you to modify the local and remote console configuration.
Do you want to modify parameters on the Local Console Port? (Y/[N]) y
Current Local Console Port baud rate is : 9600 bits/s
Do you want to modify it ? (Y/[N]) n
Current Flow Control is : Software
Do you want to modify it ? (Y/[N]) n
Do you want to modify parameters on the Remote Console Port? (Y/[N]) y
Current Modem Protocol is : CCITT
Do you want to modify it ? (Y/[N]) n
Current Remote Console Port baud rate is : 2400 bits/s
Do you want to modify it ? (Y/[N]) n
Current Flow Control is : Software
Do you want to modify it ? (Y/[N]) n
Sending Configuration Strings to Modem is : Enabled
Do you want to modify it ? (Y/[N]) n
Modem Presence is : always connected
Do you want to modify it ? (Y/[N]) n
Command execution may take 25 seconds.
-> Parameters have been updated.
用er命令激活远程拨入MODEM:
GSP>er
Current console access state is :
Remote Console : Disabled
LAN Console : Enabled
Do you want to modify this configuration ? (Y/[N]) y
Do you want to Enable the Remote Console ? (Y/[N]) y
-> Remote Console will be : Enabled
Command execution may take 25 seconds.
New console access state is :
Remote Console : Enabled
LAN Console : Enabled
GSP Host Name: machine
注意：mr命令可复位MODEM，配置完成后用co命令返回控制台终端模式。