Intel MD566X manual DTE-to-DCE Data Rates for Each Mode, DCE-to-DCE Data Rates for Each Mode

56K V.92 Data, Fax, and Voice Chipset

Examples of modem responses:

OK

ERROR

CONNECT 28800

0

In the online state, the DCE is off-hook and communicating with a remote modem. Any data sent from the DTE to the DCE is transmitted to the remote modem. Similarly, any data that the DCE receives from the remote modem is transmitted to the DTE.

Note: In the online state, the DCE does not ‘echo-back’ any of the data that the DTE sent to the DCE.

The modem recognizes AT commands from the DTE at any valid data rate from 300 bps to 115,200 bps (that is, the modem autobauds up to 115,200 bps); however, the DTE should use the data rate specified for each mode according to the transmitting direction — DTE-to-modem (Table 1-2) or modem-to-modem (Table 1-3).

Table 1-2. DTE-to-DCE Data Rates for Each Mode

Mode	Data Rate (bps)	Affected Data
Data (V.34)	2400–115,200
Data (V.90)	28,800–115,200	DTE-to-modem data rate
Data (V.92)	28,800–115,200
Fax	19,200
Voice	19,200–115,200	AT commands, playback and record modes
		(varies according to compression type)

Table 1-3. DCE-to-DCE Data Rates for Each Mode

Mode	Data Rate (bps)	Affected Data
Data (V.34)	2400–33,600
transmit and receive
Data (V.90) transmit	4800–33,600
Data (V.90) receive	28,800–56,000
(ISP connections only)		DTE-to-modem data rate
Data (V.92) transmit	24,000–48,000
Data (V.92) receive	28,800–56,000
(ISP connections only)
Fax	2400–14,400
Voice	Not applicable	Not applicable

Each command may have one or more parameters associated with it. If a parameter is not sent for a command requiring a numeric parameter, then the modem assumes a zero (“0”) parameter (only if zero is a valid parameter for the command). For example, ATZ and ATZ0 commands perform identical functions (that is, the modem sees ‘ATZ’ and automatically uses the ‘0’ parameter during processing the command). Other commands do not use parameters.

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