SVDFAQ.TXT 11 OCT 96
Revision 1.0
MATT ALFORD
DIAMOND MULTIMEDIA SYSTEMS, INC.
THIS DOCUMENT MAY BE DISTRIBUTED FREELY PROVIDED THAT IT IS
REPRODUCED IN ITS ENTIRETY.
CONTENTS
1 Introduction
2 Identifying the features your modem supports
2.1 Using the ATi10 command
2.2 Feature definitions
2.2.1 Handset Support (170)
2.2.2 Headset Support (171)
2.2.3 Full Duplex Speakerphone (176)
2.2.4 V.80 Synchronous Access Mode
3 SVD Example Sessions
3.1 Voice-first connections from terminal mode
3.1.1 Handset
3.1.2 Headset
3.1.3 Speakerphone
3.1.4 Various combinations of handset, headset, speakerphone
3.2 SVD connections without establishing a voice call first
3.2.1 From terminal mode
3.2.2 Games
4 Notes on video conferencing
5 Technical Support
1 INTRODUCTION
The term "SVDFAQ" stands for "Simultaneous Voice and Data
Frequently Asked Questions." This document is designed to
accompany Diamond 33,600bps modems. Not all all Diamond 33.6
modems support the SVD feature and Section 2 tells you how to
query your modem for a list of supported features.
There are two main types of SVD designs: Analog (ASVD) and Digital
(DSVD). As of this writing, Diamond only supports ASVD (referred
to as "SVD" in this document).
Simultaneous voice and data gives you the ability to carry on a
voice conversation while transmitting data at the same time over
a single telephone line. It does require that both modems support
the SVD feature.
2 IDENTIFYING THE FEATURES YOUR MODEM SUPPORTS
2.1 USING THE ATi10 COMMAND
To see a complete list of the special features that your modem
supports, you need to open a data terminal software program
(such as HyperTerminal, COMit, TRIO, or Procomm Plus) and issue
the command:
ATi10 and press ENTER
The modem will return the exact model name of your modem and a
list of supported features. While there are many features
available, the only one which matters for SVD connectivity is
178 ASVD
If your modem supports option 178, then it supports the
SVD feature. Your modem may or may not also support
170 Handset Support
171 Headset Support
176 Full Duplex Speakerphone
These options 170, 171, and 176 are not included in every
Diamond modem. The example sessions contained in Section 3
cover a variety of modem configurations so don't be concerned
if your modem does not support all of these features.
2.2 FEATURE DEFINITIONS
2.2.1 HANDSET SUPPORT (170)
Handset support is also referred to as "powered
handset" which means that the modem provides the
power necessary to use a telephone handset
connected through the modem. In other words, if the
modem is in voice mode, you will be able to use an
attached handset to talk through the modem to the remote
person.
2.2.2 HEADSET SUPPORT (171)
Headset support allows you to use a combination headset/
microphone with your modem.
2.2.3 FULL DUPLEX SPEAKERPHONE (176)
Full duplex speakerphone allows you to talk and hear at
the same time (like a regular analog telephone). Half
duplex only allows you to talk OR listen, but you cannot
do both at the same time (like a CB radio or a walkie
talkie).
2.2.4 V.80 SYNCHRONOUS ACCESS MODE (186)
V.80 allows your modem to support video conferencing
software.
3 SVD EXAMPLE SESSIONS
3.1 VOICE-FIRST CONNECTIONS FROM TERMINAL MODE
In a voice-first scenario, you establish a voice connection
and then switch to SVD-mode during the call. There are many
different ways to accomplish this depending upon whether your
modem supports Speakerphone (SP), Headset, and/or Handset
options. All of these examples assume that you have two
Diamond ASVD modems (one on each end of the call).
NOTE: It's important to understand that the voice portion of
SVD only works when you "talk through" the modem. In other
words, you can only talk to the remote person through a
handset, headset, or microphone that is attached to your
computer. More specifically, the handset, headset, or
microphone must be connected to your modem either directly
or via cable from the soundcard. Some Diamond modems have
microphone and speaker jacks while others have a "header"
for connecting a cable from a soundcard. If your modem
has neither a microphone jack nor a cable header, it does
not support SVD.
ANOTHER NOTE: Most games don't have a terminal mode where you
can issue commands to the modem. In this case, you wouldn't
establish a "voice-first" connection, you would want an "SVD
FIRST" connection. Instructions for this are in section 3.2.
3.1.1 HANDSET
If your modem has two telephone jacks and it supports
special feature 170 (powered handset), you can connect
the telephone line to the "line" jack and a telephone
handset to the "phone" jack.
If your modem has only one telephone jack and it supports
special feature 170 (powered handset), you need a special
"Y" adapter for your telephone line that separates the
inner and outer pairs of telephone wires. (The power
for the handset is carried along the outer pair of wires
to the telephone).
Step 1: Party 1 calls Party 2 via telephone handset.
Step 2: Both parties open data terminal software (such as
HyperTerminal, Procomm Plus, COMit, etc).
Step 3: Both sides type AT&F2-SMS=2 and press ENTER.
Step 4: Party 1: Type ATD and press ENTER.
Step 5: Party 2: when the RING message appears on the screen
type ATA followed by the ENTER key.
NOTE: The voice channel will temporarily go silent
while the modems negotiate the SVD connection.
The modems will negotiate a connection. Once the
CONNECT XXXX message appears on the screen, the
voice conversation can resume and data may be
transferred between the two modems via the terminal
software.
Step 6: When you are ready to disconnect the call, either
side can type +++ wait for OK to appear on the
screen and then type ATH and press ENTER. This
will drop the CARRIER entirely (there is no way
to drop back from SVD mode into voice-only mode
without redialing and establishing a new
connection).
3.1.2 HEADSET
If you want to use a headset and your modem has headset
support (optional feature 171), you will need a special
headset that separates the headset cable into separate
microphone and speaker plugs. One plug goes into the MIC
jack on the modem and the other goes into the SPKR jack on
the modem.
NOTE: Connecting a headset to the MIC and SPKR jacks is
the same as connecting a microphone and speakers to the
modem and using them in speakerphone mode. However,
enabling headset mode in the modem changes the echo
cancellation characteristics and may provide better
sound quality.
Some modems also have an audio header so the modem can be
connected directly to the soundcard via cable. In this
situation, your headset could be connected to your soundcard
instead of directly to the modem.
Step 1: Both parties open data terminal software (such as
HyperTerminal, Procomm Plus, COMit, etc).
Step 2: Both sides type AT&F2#CLS=8#VLS=5 and press ENTER.
This puts both modems in headset voice mode.
Step 3: Party 1: call Party 2 through the terminal
software by typing ATDT followed by the telephone
number and then press ENTER.
Step 4: Party 2: when the RING message appears on the screen,
type ATA and press RETURN to answer the call. The
modem will go off-hook and both parties can converse
via headset.
Step 5: When both parties are ready to switch to SVD modem,
both sides type AT-SMS=2 and press ENTER.
Step 6: Party 1: Type ATD and press ENTER.
Step 7: Party 2: when the RING message appears on the screen
type ATA followed by the ENTER key.
NOTE: The voice channel will temporarily go silent
while the modems negotiate the SVD connection.
The modems will negotiate a connection. Once the
CONNECT XXXX message appears on the screen, the
voice conversation can resume and data may be
transferred between the two modems via the terminal
software.
Step 8: When you are ready to disconnect the call, either
side can type +++ wait for OK to appear on the
screen and then type ATH and press ENTER. This
will drop the CARRIER entirely (there is no way
to drop back from SVD mode into voice-only mode
without redialing and establishing a new
connection).
3.1.3 SPEAKERPHONE
You can use a microphone and speakers in "speakerphone" mode
if your modem supports optional feature 176 (Full duplex
speakerphone). This allows hands-free operation while
conversing through the modem.
There are several possibilities for microphone and speaker
connections. If your modem has external MIC and SPKR jacks,
you can connect the microphone and speakers directly to
the modem. If you have a soundcard, you could also connect
an audio cable from the modem SPKR jack to the soundcard's
MIC jack and connect your speakers to the soundcard's
SPKR jack. If your modem has an audio header for connecting
the modem directly to the soundcard via an internal cable,
you can connect the microphone and speakers to either the
modem or the soundcard.
NOTE: If you aren't sure where to hook up your microphone
and speakers, experiment. The microphone and speaker
voltages are low enough that you won't blow up your modem
or your soundcard if you don't get it right the first time.
Sometimes the jacks on soundcards aren't labelled, so
experimentation is the only way to find a working solution.
Step 1: Both parties open data terminal software (such as
HyperTerminal, Procomm Plus, COMit, etc).
Step 2: Both sides type AT&F2#CLS=8#VLS=6 and press ENTER.
This puts both modems in speakerphone voice mode.
Step 3: Party 1: call Party 2 through the terminal
software by typing ATDT followed by the telephone
number and then press ENTER.
Step 4: Party 2: when the RING message appears on the screen,
type ATA and press RETURN to answer the call. The
modem will go off-hook and both parties can converse
via headset.
Step 5: When both parties are ready to switch to SVD modem,
both sides type AT-SMS=2 and press ENTER.
Step 6: Party 1: Type ATD and press ENTER.
Step 7: Party 2: when the RING message appears on the screen
type ATA followed by the ENTER key.
NOTE: The voice channel will temporarily go silent
while the modems negotiate the SVD connection.
The modems will negotiate a connection. Once the
CONNECT XXXX message appears on the screen, the
voice conversation can resume and data may be
transferred between the two modems via the terminal
software.
Step 8: When you are ready to disconnect the call, either
side can type +++ wait for OK to appear on the
screen and then type ATH and press ENTER. This
will drop the CARRIER entirely (there is no way
to drop back from SVD mode into voice-only mode
without redialing and establishing a new
connection).
3.1.4 VARIOUS COMBINATIONS OF HANDSET, HEADSET, SPEAKERPHONE
All of the preceeding examples in 3.1.1, 3.1.2, and 3.1.3
assume identical configurations on both ends of the call
(handset:handset, headset:headset, SP:SP). However, you
can mix and match the voice options.
For example, Party 1 could use speakerphone mode while
Party 2 uses headset mode.
The examples in 3.1.1, 3.1.2, and 3.1.3 can be modified
to meet your specific setup. The #VLS=n command controls
the voice mode in the modem:
#VLS=0 Handset mode (default)
#VLS=5 Headset mode
#VLS=6 Speakerphone mode
NOTE: The modem must be placed in voice mode with
AT#CLS=8 prior to issuing the AT#VLS=n command. For
example AT#CLS=8#VLS=6 places the modem in voice
mode with the speakerphone option enabled.
You can change the #VLS=n commands in examples 3.1.1,
3.1.2, and 3.1.3 to match your specific setup.
3.2 SVD CONNECTIONS WITHOUT ESTABLISHING A VOICE CALL FIRST
NOTE: This section assumes that your handset, headset, and/or
microphone are already connected to your computer. For more
information on connection options, see section 3.1 above.
3.2.1 CONNECTING FROM TERMINAL MODE
Step 1: Both parties open data terminal software (such as
HyperTerminal, Procomm Plus, COMit, etc).
Step 2: Both sides type AT&F2-SMS=2#VLS=5 and press ENTER.
This puts both modems in headset voice mode. If
you are using speakerphone, substitute #VLS=6 instead
of #VLS=5. If you are using handset, substitute
#VLS=0 instead of #VLS=5.
Step 3: Party 1: call Party 2 through the terminal
software by typing ATDT followed by the telephone
number and then press ENTER.
Step 4: Party 2: when the RING message appears on the screen,
type ATA and press ENTER.
The modems will negotiate a connection. Once the
CONNECT XXXX message appears on the screen, the
voice conversation can begin and data may be
transferred between the two modems via the terminal
software.
Step 7: When you are ready to disconnect the call, either
side can type +++ wait for OK to appear on the
screen and then type ATH and press ENTER. This
will drop the CARRIER entirely (there is no way
to drop back from SVD mode into voice-only mode
without redialing and establishing a new
connection).
3.2.2 GAMES
Dial-up games such as WarCraft support ASVD connections by
simply modifying the modem initializion string in the game.
Add the following line to the end of the existing modem
initialization string:
-SMS=2#VLS=0 for handset mode
-SMS=2#VLS=5 for headset mode
-SMS=2#VLS=6 for speakerphone mode
After adjusting the initialization string, follow the normal
game instructions for dialing and connecting.
4 NOTES ON VIDEO CONFERENCING
Video conferencing requires a Diamond modem that supports the V.80
protocol (optional feature 186). Most Diamond 33600bps modems
support V.80. To find out for sure if your modem supports V.80, issue
the command ATi10 through your data terminal software. If one of the
result codes is 186, then your modem supports the V.80 protocol.
You do NOT need an ASVD modem in order to do video conferencing. The
simultaneous voice and data features in video conferencing are handled
by the video conferencing software, not the modem. V.80 is the
protocol that instructs the modem how to convert the video conferencing
data from synchronous to asynchronous mode for transmission across an
analog telephone line. There are several protocols involved in this
process, but this example is simplified for brevity.
As more information becomes available on video conferencing software
settings, options, and features, we will post it on our online
sites (World Wide Web, CompuServe, and BBS).
5 TECHNICAL SUPPORT
Updates to this and other technical support documents are regularly
posted on Diamond's online services. A complete listing of contact
information is included below.
World Wide Web site
USA http://www.diamondmm.com
Germany http://www.spea.com
FTP site
USA ftp.supra.com
ftp.diamondmm.com
E-mail
USA intltech@supra.com (English)
Germany GO SPEA on CompuServe
U.K. 100632.1252@compuserve.com
CompuServe Forum
USA GO SUPRA
Germany GO SPEA
Supra Technical Support BBS
USA +1 541 967 2444 (modem)
Germany +49 81 51 266 333 (modem)
+49 81 51 266 334 (ISDN)
U.K. +44 11 89 44 44 15 (modem)
Fax
USA +1 541 967 2401
Fax Back (call with touch tone phone)
USA +1 541 967 0072 (English)
Germany +49 81 51 26 63 32 (German and English)
Voice
USA +1 541 967 2450
Germany +49 81 51 26 63 30 (German)
U.K. +44 11 89 44 44 44 (English)
+44 11 89 44 44 33 (French)
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