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System Administration Guide: Advanced Administration
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1.  Managing Terminals and Modems (Overview)

What's New in Managing Terminals and Modems?

SPARC: Coherent Console

SPARC: Changes to How $TERM Value for Console Is Set

ttymon Invocations on the System Console Managed by SMF

Terminals, Modems, Ports, and Services

Terminal Description

Modem Description

Ports Description

Services Description

Port Monitors

Tools for Managing Terminals and Modems

Serial Ports Tool

Overview of the Service Access Facility

2.  Setting Up Terminals and Modems (Tasks)

3.  Managing Serial Ports With the Service Access Facility (Tasks)

4.  Managing System Resources (Overview)

5.  Displaying and Changing System Information (Tasks)

6.  Managing Disk Use (Tasks)

7.  Managing UFS Quotas (Tasks)

8.  Scheduling System Tasks (Tasks)

9.  Managing System Accounting (Tasks)

10.  System Accounting (Reference)

11.  Managing System Performance (Overview)

12.  Managing System Processes (Tasks)

13.  Monitoring System Performance (Tasks)

14.  Troubleshooting Software Problems (Overview)

15.  Managing System Messages

16.  Managing Core Files (Tasks)

17.  Managing System Crash Information (Tasks)

18.  Troubleshooting Miscellaneous Software Problems (Tasks)

19.  Troubleshooting File Access Problems (Tasks)

20.  Resolving UFS File System Inconsistencies (Tasks)

21.  Troubleshooting Software Package Problems (Tasks)


Terminals, Modems, Ports, and Services

Terminals and modems provide both local and remote access to system and network resources. Setting up terminals and modem access is an important responsibility of a system administrator. This section explains some of the concepts behind modem and terminal management in the Oracle Solaris operating system.

Terminal Description

Your system's bitmapped graphics display is not the same as an alphanumeric terminal. An alphanumeric terminal connects to a serial port and displays only text. You don't have to perform any special steps to administer the graphics display.

Modem Description

Modems can be set up in three basic configurations:

A modem connected to your home computer might be set up to provide dial-out service. With dial-out service, you can access other computers from your own home. However, nobody outside can gain access to your machine.

Dial-in service is just the opposite. Dial-in service allows people to access a system from remote sites. However, it does not permit calls to the outside world.

Bidirectional access, as the name implies, provides both dial-in and dial-out capabilities.

Ports Description

A port is a channel through which a device communicates with the operating system. From a hardware perspective, a port is a “receptacle” into which a terminal or modem cable might be physically connected.

However, a port is not strictly a physical receptacle, but an entity with hardware (pins and connectors) and software (a device driver) components. A single physical receptacle often provides multiple ports, allowing connection of two or more devices.

Common types of ports include serial, parallel, small computer systems interface (SCSI), and Ethernet.

A serial port, using a standard communications protocol, transmits a byte of information bit-by-bit over a single line.

Devices that have been designed according to RS-232-C or RS-423 standards, this include most modems, alphanumeric terminals, plotters, and some printers. These devices can be connected interchangeably, using standard cables, into serial ports of computers that have been similarly designed.

When many serial port devices must be connected to a single computer, you might need to add an adapter board to the system. The adapter board, with its driver software, provides additional serial ports for connecting more devices than could otherwise be accommodated.

Services Description

Modems and terminals gain access to computing resources by using serial port software. Serial port software must be set up to provide a particular “service” for the device attached to the port. For example, you can set up a serial port to provide bidirectional service for a modem.

Port Monitors

The main mechanism for gaining access to a service is through a port monitor. A port monitor is a program that continuously monitors for requests to log in or access printers or files.

When a port monitor detects a request, it sets whatever parameters are required to establish communication between the operating system and the device requesting service. Then, the port monitor transfers control to other processes that provide the services needed.

The following table describes the two types of port monitors included in the Oracle Solaris release.

Table 1-1 Port Monitor Types

Man Page
Port Monitor
Controls access to network services, such as handling remote print requests prior to the Solaris 2.6 release. The default Oracle Solaris OS no longer uses this port monitor type.
Provides access to the login services needed by modems and alphanumeric terminals. The Serial Ports tool automatically sets up a ttymon port monitor to process login requests from these devices.

You might be familiar with an older port monitor called getty. The new ttymon port monitor is more powerful. A single ttymon port monitor can replace multiple occurrences of getty. Otherwise, these two programs serve the same function. For more information, see the getty(1M) man page.