On - Go Online Command

Command Line Format
AT [cmds] O [suffix] <CR>

Suffix Values
0, 1, 3

Default
N/A

Stored by &Wn
N/A

Displayed by &V
N/A

Description
If the modem is in the Online Command State, then the O0 command causes it to go to the online state of the previously established connection. If the O1 command is issued, then the modem goes to online state and retrains its adaptive equalizer, if it has one.

If the modem is off-hook in the idle state, then O0 and O1 cause it to go to the handshaking state. Originate or answer mode is determined from the last D or A command or R dial modifier that was selected. If the modem is on-hook in the Idle State, or if the modem is in a test state, then a command execution error results.

O3 is valid only in the Online Command State and if rate re-negotiation is supported. The command initiates a rate re-negotiation procedure. The new rate possibilities are those selected by the value of S109, which must be set before issuing the O3 command. The value of S37 and N do not affect the rate re-negotiation procedure. If rate re-negotiation is not currently supported, then the modem sends the ERROR result code.

Result Codes

ERROR - if modem is on hook or &T1, &T3, &T6-&T8 is active or On cannot be executed.

NO CARRIER - if O1 is issued and the equalizer retrain is not successful in the time specified by S7.

Execution Time
Depends on retrain procedure (per modulation type).

Cross Reference
Commands - &T1, &T3, &T6-&Local Analog Loopback with Self Test - &T8

DTE signals - DTR, DSR, CTS, RLSD

Line signals - Carrier

LEDs - CD, HS

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