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Data Endpoint States
The data endpoint may take on three states: (l) off-line, (.2) on-line (on-hook), and (3) on-line
(off-hook). Off-line is when a data terminal is out of service (turned off, disconnected, etc,).
The on-line (on-hook) state occurs when the terminal is turned on, is available to answer a
call, but is not on a data call. Finally, the on-line (off-hook) state is when the data endpoint
is actively on a data call.
Data Call Processing Modes
Data calls differ both in signaling and call setup from voice calls. For this reason, a unique
set of data call processing modes have been defined to support data call operation in a
manner consistent with the characteristics of data terminals.
a. Off-Line Mode
The data endpoint is considered to be in the Off-Line Mode whenever the data
endpoint’s DTR signal is inactive (e.g.,
“turned off”). The endpoint is considered
unavailable and calls to this endpoint will receive the “RINGING” message or
Ringback (indefinitely).
b. Idle Mode
The Idle Mode indicates that the data endpoint is in its on-line, on-hook state.
While idle, call processing will allow the endpoint to:
—
Enter either Data Terminal Dialing mode to originate a data call, or enter
the Setup mode after a call is originated from a voice terminal (Transfer To
Data) or other data terminal (Third-Party Call Setup; V2 only).
—
Autoanswer a data call and go into Setup mode.
The data endpoint remains in the Idle mode while the user is establishing a data
call from a voice terminal until Transfer To Data is activated.
c. Command Mode
Command Mode enables the Data Terminal Dialing feature, allows the user to view
and change (V2 only) associated data port options, and provides access to the
Third-party Call Setup feature (V2). Command Mode may be entered by going on-
line and pressing Break or Break-Return.
d.
Expert Mode is an enhancement to the Command Mode feature that provides an
alternative method of performing the full range of Command Mode functions. By
eliminating the display of menus and allowing multiple commands to be entered on
a single line, Expert Mode lends itself to computer-driven instructions. Individual
users who are very familiar with Command Mode operations may also find it
useful.
e. Data Terminal Dialing Mode
Data Terminal Dialing is a data feature accessed via Command Mode. It provides a
procedure to establish data calls without the use of a voice terminal. Data
Terminal Dialing supports both on-premises and off-premises data calls (with the
support of the System 25 Modem Pooling feature).
Dialed digits are entered from
the data terminal keyboard or host computer (using a program compatible with
Data Terminal Dialing protocol). Call progress text messages are sent to the
terminal in place of call progress tones.
Upon completion of digit entry, Data Call
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