DART 200 CDPD Modem User’s Guide | Glossary |
baud
block
A unit of signaling speed which represents the number of discrete conditions or signaling events per send that are transmitted or received over the link.
The frequency at which the transmission medium is modulated.
Often used incorrectly to state data transmission speed. By using various modulation schemes it is possible to encode multiple bits/baud. See also, bps.
In CDPD, a 378 bit
byte | An 8 bit data symbol of which there are 256 possible |
| combinations. Bytes are normally represented by 2 |
| hexadecimal |
| printed, or is used for control purposes it can also be |
| referred to as a character (ASCII for example). Not all |
| bytes are characters by this definition. |
carrier | The signal you hear from your modem when it is not |
| transmitting information, but is still in communication |
| with another modem. |
cell | The area surrounding a cellular tower where RF |
| transmissions can be received at an acceptable signal |
| strength. For CDPD operations the MDBS is located at |
| the cell site. |
character
color code
CONNECT
data
flow control
Any symbol that is text that can be displayed on the screen, such as ASCII. Generally represents an
See byte.
A numeric identifier used to distinguish between adjacent components of CDPD networks (MDBSs, MDISs). Used to detect interference, or transfers between network components.
With a
Information exchanged between a source and destination. This can consist of a single bit or a long string of bits, depending on the application.
A standard for controlling the flow of data, in either direction, between a modem and an attached device to prevent overruns. Implementation can be by hardware (RTS/CTS) or software (XON/XOFF) means. Sometimes called handshaking.
