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CNG Tone
The 1100Hz "beeping" tone a fax machine or faxmodem emits when calling out. When the
receiving fax detects this tone, it automatically connects. It is this tone which allows a call-
switching device to recognize an incoming fax call and transfer the call to the fax machine or
modem. SupraSonic and SupraFAXModems using "Silent Answer" can recognize the CNG tone
to receive a fax.
Command State
Operating mode where your modem will accept AT commands.
Synonyms:
Terminal State
,
Local State
. See also
Online State.
Computer Rate
The rate at which a modem (DCE) and a computer (DTE) communicate. This is what changes
when you set rate in your telecom software.
Synonyms:
Serial Port Rate, Modem-to-Computer
Speed, DTE-DCE Rate, Communications Rate.
Config.sys
In MS-DOS, an ASCII text file in the root directory that contains configuration commands. MS-
DOS consults this file at system startup.
Connection Rate
The rate at which modems communicate over a phone line.
Synonyms:
Transmission Speed,
Line Speed, Carrier Rate, Modem-Modem Speed, DCE-DCE Rate.
CTS — Clear to Send Signal
See
Hardware Handshaking.
Data Carrier Detect (DCD)
Signal from the modem or printer (DCE) to the DTE (your computer) to indicate that the
modem is receiving a carrier signal from the modem at the remote end of the telephone
circuit.
Data Compression
The process of reducing the size of data parcels to transmit more data in less time.
See also:
Error Correction/Data Compression Protocols.
Data Terminal Ready (DTR)
Data Terminal Ready. Control signal from the DTE (computer) to the DCE (modem or printer)
to indicate that the DTE is on and ready. Also used for hardware flow control.
DCE
Data Communications Equipment. Your modem.
See also:
DTE.
Digital Signals
Discrete, uniform signals.
Direct Connection
Any standard modem connection, without error correction, data compression, or flow control.
Computer rate must equal connection rate.
