You have accessed an
older version of a
Paradyne product
Paradyne is no longer a
subsidiary of AT&T. Any
reference to AT&T
Paradyne is amended to
read Paradyne
Please note that the area
code for Paradyne
Corporation in Largo,
Florida has changed from
813 to 727.
For any Paradyne
telephone number that
appears in this manual
with an 813 area code,
dial 727 instead.
DataPort 2001
Update for Release 2.5
Document Number 3730-A2-GK41-00
AT&T Paradyne is making continual improvements in the
DataPort 2001 Multimedia Communicator’s operational firmware
(the program executed by the DataPort 2001’s internal
microprocessors). Developments include enhanced sound in
VoiceSpan mode and the DataBurst feature. DataBurst
automatically switches to data-only mode at the highest data
rate possible whenever an audio silence occurs (such as the
silences between spoken words), and switches back to
simultaneous audio and data mode when there is sound to
transmit. This means that data can be transmitted much faster.
This document provides the additional information you need to
take advantage of these features. It also contains general
information about VoiceSpan usage.
Table 1 shows AT commands and S-registers changed or added
since October 1993. Use this information in conjunction with
your DataPort 2001 Multimedia Communicator with VoiceSpan
Introduction (3730-A2-GZ41-00).
The DataPort 2001 is approved for sale and use in Canada. The
DataPort 2001 has been certified by the Canadian Department
of Communications to the CS-03 standard. The DOC
Certification number is 230 5720 A, and the Load number is 2.
DataBurst is a trademark of AT&T.
VoiceSpan is a trademark of AT&T.
March 1995
DataPort 2001 Update for Rel. 2.5
Table 1. AT Command and S-Register List (1 of 3)
AT Command/
RI Follows Phone Hookswitch
Determines the basis of the Ring Indicator (RI) signal.
RI may indicate the hookswitch status of the telephone
connected to the Voice Interface Port (VIP) of the local
phone (S68=1) or the remote phone (S68=2). Under
the the default value (S68=0), RI corresponds to calling
tones received from the remote station.
&Fn has no effect on S68. %VF sets S68 to 0.
Power-Up Cable Test
Determines whether the cable test is run when power
to the modem is turned on. The cable test flags
miswiring when it detects a Central Office phone line
plugged into the VIP.
NOTE: Because the value of S70 is not tested until a
power reset, the &W command must follow the S70=n
command to write the setting to non-volatile memory.
&Fn has no effect on S70. %VF sets S70 to 0.
Flash Hook Control of High Speed
Determines whether a tap of the local telephone’s
hookswitch can be used to toggle the modem between
high-speed data-only mode and VoiceSpan mode.
NOTE: The flash hook command, if enabled, controls
only the transmit path. The remote modem controls the
receive path.
&Fn has no effect on S71. %VF sets S71 to 0.
March 1995
DataPort 2001 Update for Rel. 2.5
Table 1. AT Command and S-Register List (2 of 3)
AT Command/
VoiceSpan Symbol Rate
Sets the symbol rate used by VoiceSpan. The
2800 baud setting is for cellular lines with limited
bandwidth. The setting of S73 does not affect the data
rate, but may affect sound quality.
3000 baud
2800 baud
&Fn has no effect on S73. %VF sets S73 to 0.
VoiceSpan Fast Train
Enables or disables fast training when running
VoiceSpan. The V.32bis Train Time setting (S43) has
no effect when VoiceSpan is in use, and S75 has no
effect when modulations other than VoiceSpan are
&Fn has no effect on S75. %VF sets S75 to 0.
V.17 Fax Disable
Enables and Disables V.17 fax (14,400 bps)
functionality. This is for use with fax software that does
not properly support V.17, but attempts to use it when a
modem reports that it has V.17 capability.
&Fn and %VF have no effect on S79. The modem is
shipped with S79 set to 0.
March 1995
DataPort 2001 Update for Rel. 2.5
Table 1. AT Command and S-Register List (3 of 3)
AT Command/
No Data Disconnect Trigger Signal
Determines whether Pin 2 (transmit data) or Pin 3
(receive data) of the modem’s serial interface is
monitored for activity so that the modem can
disconnect the call if there is no activity for a certain
period. This is used in conjunction with the No Data
Disconnect Timer (\T).
Transmit or Receive (Inactivity on
either causes disconnect)
Transmit Only
Receive Only
Transmit and Receive (Inactivity on
both required for disconnect)
The &Fn command sets S80 to 0.
DataBurst Control
Enables and disables DataBurst operation in the
remote DataPort 2001’s transmitter.
&Fn has no effect on DataBurst Control. %VF sets the
default of %VA1.
VoiceSpan Defaults
Sets S-registers S61 through S64, S66 through S68,
S71, S73, and S75, and configuration options %VA,
%VG, %VH, %VL, and %VS for VoiceSpan operation.
March 1995
DataPort 2001 Update for Rel. 2.5
Configuring the DataPort 2001
for VoiceSpan
Your DataPort 2001 was shipped already configured for
VoiceSpan operation. If you change the configuration and need
to restore VoiceSpan, issue the following AT commands.
1. AT&F
(Load factory defaults)
2. AT%VF
(Load factory VoiceSpan defaults)
3. ATS0=0
(Disable Auto-Answer)
4. AT&W
(Save options in non-volatile memory)
Starting a VoiceSpan Session
A VoiceSpan session can begin with one DataPort 2001 dialing
another (as with an ordinary modem-to-modem session), or it
can begin as a normal voice telephone call. Two users might
discuss what communications application they are going to run
on their DTEs (for example, which interactive computer game
they would like to play together), or they might establish that the
applications are already running and they are ready to proceed.
When the two users wish to connect in VoiceSpan mode, they
cause one application to dial and the other to answer. How this
is done depends on the application. In some applications, dialing
is simply a matter of selecting a telephone icon on the
originating side; some applications require that you type a
command. Answering may be automatic, or may require some
user action.
Although the connection is already made, the DataPort 2001s
make it appear to the applications that a new phone call is being
initiated and answered. The users are now in a VoiceSpan
session. While their DTE applications can send data back and
forth, the users can also simultaneously communicate by voice.
The following pictures show the beginning of a typical
VoiceSpan session.
March 1995
DataPort 2001 Update for Rel. 2.5
1) Working at home, Chris
telephones his colleague Jan
to discuss an upcoming
multimedia presentation.
2) After a few minutes they
realize it would be useful to
view the images they are
3) Using his PC, Chris
initiates a call to Jan’s
March 1995
DataPort 2001 Update for Rel. 2.5
4) Jan’s DataPort 2001
answers Chris’s call and
sends a RING message to
her PC.
Chris and Jan are now in VoiceSpan mode.
5) Being able to view,
change, and discuss the
slides for their presentation...
6) ...Chris and Jan are able
to work as if they are
together in the same room.
The DataPort 2001 supports the possible combinations of
Manual Dial, Manual Answer, Auto-Dial, and Auto-Answer. In
cases where there is no local telephone off-hook, the DataPort
2001 connects in data-only VoiceSpan mode (no audio). Then,
when one user picks up the local telephone, the remote
DataPort 2001 rings.
March 1995
DataPort 2001 Update for Rel. 2.5
In VoiceSpan mode, data transmission occurs at 4800 bps when
there is sound to transmit at the same time. However, whenever
the transmitting DataPort 2001 detects silence, it sends data at
the highest rate possible (up to 14,400 bps). When there is new
sound to transmit, the DataPort 2001 reverts to a data rate of
4800 bps. Switches between the high and low rates are made so
quickly that they do not appreciably alter the sounds you hear.
This feature is called DataBurst, and can be enabled or disabled
with the AT command %VA. (It also is enabled when the
VoiceSpan Defaults AT command %VF is issued.) Enabling
DataBurst on your DataPort 2001 affects the audio and data
being sent to you. The rate at which your DataPort 2001
transmits data is affected by whether DataBurst is enabled in the
remote DataPort 2001.
During a telephone conversation a DataPort 2001 can transmit
data at high speed most of the time. This is because one party
normally is silent while the other speaks, and even the speaker
must occasionally pause for breath. During a normal
conversation the data rate may average as much as 12,000 bps.
When music or other nearly constant sound is being transmitted,
the advantage of DataBurst is significantly reduced.
Data-Only Mode
To force data to be transmitted at the highest possible rate, you
can momentarily disable the audio in one or both directions. This
is done by hanging up your telephone, by pressing the
telephone hookswitch briefly (called a “flash hook”), or by issuing
a High Rate VoiceSpan Control command (%VH1) from your
computer. All three methods enable high-speed data transfer
and disable audio transmission for one direction. The user in
VoiceSpan mode can continue to be heard by the person in
data-only mode, but can hear only a beeping alert tone in the
telephone receiver. This alert tone means the other party can no
longer communicate by voice.
Simultaneous audio and data mode resumes when you lift the
telephone receiver from the hook, perform another flash hook, or
issue a %VH0 command.
March 1995
DataPort 2001 Update for Rel. 2.5
The following pictures show a session in which data-only mode
is used.
1) Jan prepares to send a
large file...
2) ...and Chris prepares to
receive it.
3) Jan initiates the file transfer.
Jan realizes there is too much
background noise in her office for
DataBurst to have much effect.
She taps her telephone’s
hookswitch to send the file at the
maximum speed.
March 1995
DataPort 2001 Update for Rel. 2.5
4) Chris hears alert tones in
his telephone handset that
mean Jan is in data-only
mode. Jan can still hear
5) Jan also hears a periodic
beep to remind her she is in
data-only mode. At any point
she can tap the hookswitch
to return to simultaneous
audio and data mode.
Jan might instead simply hang up her phone to transmit data at
high speed, and she might suggest to Chris that he hang up his
phone, too. This way she can perform other work while awaiting
Chris’s return and the completion of the file transfer. When Chris
gets back to the telephone and picks up the handset, a ring
signal is sent to Jan’s DataPort 2001 alerting her that he is ready
to resume voice communication.
March 1995
DataPort 2001 Update for Rel. 2.5
Ending a VoiceSpan Session
To end a VoiceSpan session, one user causes the DTE
application to hang up. (How this is done is applicationdependent.) The DataPort 2001s disconnect. If the telephones
are still off-hook, the users can continue their conversation
The following pictures show the end of a typical VoiceSpan
1) Finished with their
discussion for now, Jan and
Chris direct their PC
applications to hang up...
2) ...but they still are able to
communicate until they
actually hang up their
March 1995
DataPort 2001 Update for Rel. 2.5
VoiceSpan Audio Signals
Several different sounds are used to help notify you of the status
of your VoiceSpan session.
A musical sequence similar to the AT&T calling card signal
notifies you that a VoiceSpan session has begun. This sound is
repeated when the remote DataPort 2001 switches to data-only
A short repeating beep reminds you when your DataPort 2001 is
in data-only mode, but the remote user’s DataPort 2001 is not.
Your DataPort 2001 generates two different kinds of rings. A ring
similar to a normal telephone ring alerts you when another
DataPort 2001 has dialed yours. A ring consisting of higher
tones occurs when the DataPort 2001s are connected and your
remote partner takes the remote telephone off-hook while your
telephone is still on-hook.
March 1995
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