Carrier Detect. Signal that indicates whether an interface is active. Also, a signal generated by a modem indicating that a call has been connected.

Cisco data communications platform that combines the functions of a Cisco access server with analog and digital modems, CSUs, and T1 channel banks. The Cisco 5100 is optimized for high-speed modem access and is well-suited for dial-up applications, including host access, electronic mail, file transfer, and dial-in access to a LAN. Also known as the Cisco Access Server 5100.

To install Windows 98, the system hardware must be at least an 80486DX/66 or higher machine, operating with at least 16MB of RAM. The system should also possess a modem, a mouse, and a 16-color VGA or better monitor. The system's hard drive should have between 120MB (for a portable computer) and 355MB of free space available to successfully install Windows 98. The actual amount of disk space used depends on the type of installation being performed (Typical, Custom, Portable, Compact, New, Upgrade, and so on). Typical installations use between 170- and 225MB of disk space.

it has normal uplink band width but higher down link
bandwidth (something like that)

dial-on-demand routing. Technique whereby a Cisco router can automatically initiate and close a circuit-switched session as transmitting stations demand. The router spoofs keepalives so that end stations treat the session as active. DDR permits routing over ISDN or telephone lines using an external ISDN terminal adaptor or modem.

AT commands are entered at the command line using an ATXn format. The Xn nomenclature identifies the type of command being given (X) and the particular function to be used (n). The ATZn commands reset the modem by loading new default initialization information. At the command line, just type ATZ to reset the modem. You should receive a 0, or OK response if the command was processed.