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Digital modem
A piece of equipment that joins a digital phone line to a piece of communication equipment, which may be a phone or a PC. Such equipment allows testing, condition, timing, interfacing, etc. However, it does not do what a modem does: namely, convert digital signals from machines into analog signals which can be carried on analog phone lines. The term “digital modem” is thus somewhat of a misnomer.
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A piece of hardware used to connect computers (or certain other network devices) together via a serial cable (usually a telephone line). When data is sent from your computer, the modem takes the digital data and converts it to an analog signal (the modulator portion). When you receive data into your computer via modem, the modem takes the analog signal and converts it to a digital signal that your computer will understand (the demodulator portion).
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A channel that conveys information by altering the performance of a system component or modifying a resource’s timing in a predictable manner. A covert channel in which one process signals information to another by modulating its own use of system resources in such a way that this manipulation affects the real response time observed by the second process. Covert channel in which one process signals information to another process by modulating its own use of system resources (e. g. , central processing unit time) in such a way that this manipulation affects the real response time observed by the second process.
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An Internet protocol used to run IP over serial lines such as telephone circuits or RS232 cables interconnecting two systems. SLIP is now being replaced by PointtoPoint Protocol. See PointtoPoint Protocol. An older technology developed to support TCP/IP communications over asynchronous serial connections, such as serial cables or modem dial- up.
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A software simulation of a computer within which a process executes. Each virtual machine has its own memory address space, and communication between virtual machines is securely controlled.
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A LAN term that refers to the capacity to deliver information via modem or other asynchronous connection. Outofband signaling refers to signaling that is separated from the channel carrying the information. Signal and control information does not interfere with the data transmission.
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