IBM 3274 User Manual page 66

3. When the host system has finished sending messages,
instructions will appear on your screen telling you to hang
up the telephone handset.
4. Your 3274 is now free to receive a new message from, or to
send a message to, the host system.
At a
3274
with the External Modem Interface Feature
Installed
When the 3274 has the External Modem Interface feature, the
telephone connection procedure depends upon the modem
attached to the 3274. To determine your organization's unique
operating procedures, ask the appropriate person in your
organization for instructions or refer to the appropriate user's
guide. The following procedure is a typical operating
procedure for an IBM 3872 Modem that has an Auto Answer
feature.
1. When the host system operator wishes to send a message to
one of the display stations or printers attached to the 3274,
the message is received automatically. You do not have to
be present if (1) the Data/Talk switch on the 3872 is set to
the Data position, (2) the 3274 is powered on, and (3) the
3274's Pri/Sec (Primary/Secondary) Line Speed switch is set
to the appropriate position.
Notes:
a. If the 3872's Data/Talk switch is set to Talk and the
telephone rings, pick up the telephone handset, pull up
the exclusion key (U.S. and Canada only), and, when
instructed by the host system operator, (1) set the
3872's Data/Talk switch to Data and (2) hang up the
telephone handset. The Ready light on the 3872 modem
should turn on.
b. If a call has been answered and data or control
information is not received or transmitted by the 3274
within approximately 60 to 75 seconds, the 3274 will
Section
1.
Operator Information
1-55