Control Systems

• Home

• Calendar

• ICS-CERT

• ICSJWG

• Information Products

• Training

• Recommended Practices

• Assessments

• Standards & References

• Related Sites

• FAQ

Control Systems Security Program (CSSP)

• Definition
• Documentation
• Return to Secure Architecture Design

Control System Modem Pool

Definition

A modem is a device or program that enables a computer to transmit data over telephone or cable lines. Computer information is stored digitally, whereas information transmitted over telephone lines is transmitted in the form of analog waves. A modem converts between these two forms. A "modem pool" is a group of modems. A control system modem pool allows information to be transferred between the centralized part of a control system the field located controllers and input/output devices.