Rockwell RCV288ACx Command Reference Manual page 73

Example 3: Switch from normal handset conversation to AudioSpan data connection between two RCV288 modems in
normal (non-error corrected) mode. Headset operation will be selected on the originate modem and speakerphone operation
will be selected on the answer modem as the audio interface during AudioSpan connection. The originate DTE prefers a
ML288/14400 connection for good audio quality and does not require high throughput. Both DTEs are set at 57600 bps:
Originate Modem
DTE
AT&F\N0
OK
AT#VLS=5
OK
AT-SMS= 2,
14400 ,14400
OK
ATD
CONNECT 57600
<data>
NO CARRIER
Note: The transition from handset conversation to AudioSpan mode can take up to 8 seconds. The handsets will be silenced
during the negotiation period.
1048
AT Command Reference Manual
DCE DTE
AT&F
AT#VLS=6
AT-SMS=2
ATA
<data>
+++
ATH
Answer Modem
DCE
OK
OK
OK
RING
CONNECT 57600
OK
NO CARRIER
Comments
User's establish handset
conversation and both handsets
are off-hook.
Reset modems. Normal mode
operation is selected by originate
DTE.
Handset mode selected for
originate mode. Speakerphone
mode selected for answer
modem.
Enable AudioSpan. Originate DTE
wishes to force a ML288/14400
with audio connection.
Originate modem initiates data
negotiation but will not actually
dial since the handset is already
offhook.
Answer modem detects
negotiation sequence and reports
RING message to DTE.
DTE responds to RING by
answering.
AudioSpan is established and
user's can resume conversation.
The connect message represents
the DTE speed on each side.
Modems exchange data.
Answer modem enters command
mode to prepare for disconnect.
Modems disconnect in AudioSpan
mode but handsets are still
offhook and conversation can
continue. Conversation is
terminated when both handsets
are hung up.
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