CertiGuide to Network+  9  Glossary

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To transfer a file to a local machine. Refer to Upload.

1. 1st round in creating specifications. 2. Print quality associated with 9-pin dot matrix printers.

Dynamic Random-Access Memory. Inexpensive storage which requires constant power. Made of capacitors, DRAM requires frequent refreshing.

A program that interacts with hardware or software. The driver contains special knowledge of the device or interface. In PC's the driver is frequently a translation piece of software. For example, there are many thousands of different types of video cards, and numerous operating systems. The driver is the translator between a specific video card and operating system. In the PC world, drivers are packed as Dynamic Linked Library (DLL) files. A.K.A. Device Driver.

Digital Service. A T1 line is a DS1 line, and has 24 DS0 channels.

A family of distance limited provisioning options from a Central Office (Telco) to a subscriber (customer

Data Service Unit/Channel Service Unit. A digital equivalent of a modem, the DSU formats data and controls data flow. The CSU connects to the actual digital line(s) answers to both control line and act as a buffer to the telephone company equipment should customer equipment fail. The DSU connects the network utilizing a synchronous serial cable such as a V.35 or RS-422.

A computer configuration that can start two different operating systems.

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