Modem
Specifications
and
Setup
Modem
Operations
This
chapter
describes
how you can
set
up modems and
ASCII
terminals to connect to a 3174
Asynchronous
Emulation
Adapter
(AEA) port.
Following
are
some
differences that you may
see
when attaching to a
smart
modem through
the
AEA:
• Access to the host you
select
Is not always available,
because
the connection Is
made
through a port
selected
from a pool of
ports
that
may
already
be
busy.
• The phone number of the
ASCII
host you connect to can be stored at 3174 customization time. A call
can then be placed automatically when a connection with that host Is requested.
• The options of manually dialing (keying Inthe phone number on your terminal keyboard) and testing
modems
from
a
terminal
are
available.
I • Some modem features, such as audible call progress signaling and switch-to-volcefeatures, cannot be
used.
Modem
Specifications
and
Setup
IBM
5841,
5842,
5853,
Hayes Smartmodem 300and
1200,
and
MIcom
Data Modems Models3012and 3024
are
auto-call modems supported for communication to
ASCII
hosts. The dial digits and modem commands
can
be
stored
either
In
the
3174 at customizing or
entered
from a terminal keyboard (manual dial).
For automatic calling (auto-call),
the
AEA's Interface to
IBM,
Hayes, and MIcom Intelligent
modems
conforms to the specification Inthe documentation supplied with each modem. For manual calling, the
AEA
acts only
as
a conduit for a user-to-modem conversation. The
user
represents the Interface to the
auto-call
modem
and
must
have
a
detailed
understanding
of
the
modem's
commands
and
responses.
These
modems
should
conform
to
the
following
general
specifications:
•
Asynchronous,
EIA 232D
transmission
•
Auto-answer
or
auto-call
• 9- to 11-bitcharacter frame (Includes 1 start bit, 7 data bits, 1 parity bit [optional], and 1 or 2 stop bits).
B-2
3174
Establishment
Controller
Terminal
User's
Reference
for
Expanded
Functions
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