IBM 3872 User Manual page 31

Operator Does
Not Answer
Remote
Automatic
*
*
Manual-Only (SNBU without Automatic Answering) Operation
Use these procedures if the modem is connected to a CDT DAA (or equivalent).
Calling
Make the DTE ready.
Lift the telephone handset and dial the number of the remote modem.
If the remote DTE operator answers, go to step 4. If the remote operator does not
answer, skip to step 8.
Confirm the Speed Select switch setting and ask the operator to make the remote DTE
ready. Ask if the remote modem is manual-answer only.
If the remote modem is manual-answer only, go to step 6. If the remote modem is auto-
matic, skip to step 7.
Ask the remote operator to go to data mode. Then pull up the data key and set the 3872
Talk/Data switch to DAT A. Leave the handset out of the cradle.
After data transfer, set the 3872 Talk/Data switch back to TALK. Disconnect the call
by returning the telephone handset to the cradle.
Ask the remote operator to go to data mode.
If you hear the answer tone, wait for it to end and go promptly to data mode (pull up the
data key and set the 3872 Talk/Data switch to DATA). Leave the handset out of the
cradle.
If you do not hear the answer tone, hang up and try again, from step 2.
After data transfer, set the 3872 Talk/Data switch back to TALK. Disconnect the call by
returning the telephone handset to the cradle.
*To retain the connection for voice communication, switch back to TALK but do not disconnect. For further data transfer, go back to step 4.
*
Answering
When the telephone rings, pick up the handset. (If there is no response to your greeting,
hang up.)
Confirm the Speed Select switch setting and make the DTE ready.
At the request of the calling operator, go to data mode (pull up the data key and set the
3872 Talk/Data switch to DATA). Leave the handset out of the cradle.
After data transfer, set the 3872 Talk/Data switch back to TALK. Disconnect the call by
returning the telephone handset to the cradle.
*To retain the connection for voice communication, set the 3872 Talk/Data switch back to TALK, but do not disconnect. For further data
transfer, go back to step 2.
Modem Operations 2-7