114 Glossary
N | Normal mode: Error correction is not made by MNP or V.42, but | |
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| even if serial port speed is different from modem port speed, the | |
| buffers in the modem and its flow control function permit | |
O | communication without changing their speeds. | |
on line: A functional state in which a device is ready to receive or | ||
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| transmit information. | |
| online: Available through the computer. Online may refer to | |
| information on the hard disk, such as online documentation or | |
| online help, or a connection, through a modem, to another | |
| computer or the Internet. | |
| On hook/Off hook: On hook means the “handset is on the | |
| telephone,” and off hook means it is off. The line is disconnected | |
| from the internal modem when the handset is on hook, and | |
P | connected to the internal modem when it is off hook. | |
parity: A method in serial communications of making sure that the | ||
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| information received is the same as the information that was sent. | |
| It consists of adding an error detection bit to a group of data bits, | |
| making the sum of the bits either odd or even. When you’re using | |
| a modem to connect to another computer, you can set parity to | |
| none, odd or even. In general, you should set parity to none, | |
| unless you’re requested to do otherwise. | |
| Private Branch Exchange (PBX): An automatic digital telephone | |
| switching system that enables users within an organization to | |
| place calls to each other without going through the public | |
| telephone network. Users can also place calls to outside numbers. | |
| Do not connect the Toshiba internal modem to a digital PBX | |
| line, or the modem may be damaged. | |
| protocol: A set of rules and conventions that makes it possible to | |
| transfer information between computers. If you’re transmitting a | |
| file, both modems must use the same | |
| people talking on the telephone must speak the same language to | |
| communicate effectively. Examples of modem protocols are | |
| V.34, V.42, V.90 and V.92. | |
| Public line: A line served by a telephone company to be connected | |
| to an opposite station via the exchange. |