2070-9x User’s Manual
Page 1
GLOSSARY
Anti-Streaming – A function on GDI
modems that prevents a Host from
transmitting continuously.
DCD – Data Carrier Detect. An EIA RS-
232D control signal that can be used
to gate RXD to a DTE.
DCE – Data Communications
Equipment. A device that converts
data from a DTE to a transport stream.
For example. The GDI model 400
modem is a DCE that converts RS232
data from a controller to a FSK Telco
system.
DTE – Data Terminal Equipment. A
device that initiates communication
over RS232 lines.
CTS – Clear To Send. A EIA RS-232D
control signal that can be used to gate
TXD data from a DTE.
Full duplex – A communication
system where data can be transmitted
in both directions at the same time.
Half duplex - A communication
system where data can be transmitted
in only one direction at a time.
FSK – Frequency Shift Keying.
Communication protocol where data is
encoded into binary format and
represented by different frequencies.
Host – Any DTE device.
MARK – Signal state of a FSK system
that represents a logical “1” value.
Private wire – Telco communication
hardware that is leased for private
use.
SPACE – Signal state of a FSK system
that represents a logical “0” value
0 dBm – Represents the signal level
required to produce 1mw in a 600
Ω
load.
Soft carrier
Surface mount parts – Electronic parts
that are designed to be soldered to
pads instead of vias.
RXD – Receive Data. An EIA RS-232D
data signal that transfers information
in form of binary data to a DTE.
RTS – Request To send. An EIA RS-
232D control signal that can be used
to gate TXD to a DTE. The DTE
asserts RTS and then waits for the
DCE to respond with CTS.
TXD Transmit Data. n EIA RS-232D
data signal that transfers information
in form of binary data from a DTE.
PRELIMINARY
