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Chapter 2 - Configuration
2.2 Configuration 1 - Dial-Up Link
Configuration 1 is a dial-up link using a pair of DataTalkers to provide data communications
between a home office PC and the main office host computer and telephone services through the
main office telephone system. The data and telephone services are provided using a single line
between the home office and the main office. In this application, the main office DataTalker is tied
to a host computer via an async channel, and the data channel of the home office DataTalker is
connected to the serial port of the home office PC. The composite link is provided by internal
33.6K modems in a dial-up configuration. All of the telephone services of the main office are
supplied to the home office as if the home office was directly connected to the main office
telephone system.
Asynchronous
Channel
PBX
Trunk
Trunk
Station
Trunk
Station
PSTN
Voice/Fax
Channel
Telephone
Composite Link
Asynchronous
Channel
Home Office
Voice/Fax
Channel
Telephone
PC
PSTN
DataTalker
DataTalker
COMPOSITE
LINK
STATUS
VOICE /
FAX 1
DATA/
COMMAND
ORIG
101 MDM/TA
RXTFCRRDTMV35EXTMDMDSU
CDRCVXMTCTS56RTSNSOOS
28.8 OHDBUP
TA
DTR
2B
FXSFXOE&M FAXXMTRCVXSGRSGCOMXMTRCVFC
VOICE /
FAX 2
RSGXSGRCVXMTFAXE&MFXOFXS
Data / Voice / Fax Concentrator
COMPOSITE
LINK
STATUS
VOICE /
FAX 1
DATA/
COMMAND
ORIG
101 MDM/TA
RXTFCRRDTMV35EXTMDMDSU
CDRCVXMTCTS56RTSNSOOS
28.8 OHDBUP
TA
DTR
2B
FXSFXOE&M FAXXMTRCVXSGRSGCOMXMTRCVFC
VOICE /
FAX 2
RSGXSGRCVXMTFAXE&MFXOFXS
Data / Voice / Fax Concentrator
Figure 2-1 Dial-Up Link
To set up this configuration, connect the main office DataTalker to the host computer, to the in-
office telephone system (PBX), and to the public switched telephone network (PSTN). Connect
the home office DataTalker to the serial port of your PC, to a telephone set, and to your local
telephone line. You must also connect a terminal or a PC running communications software (such
as Multi-Tech’s MultiExpress™ for DOS) to the dual function data/command port and configure
the DataTalkers. Configure the DataTalker for the main office application; i.e., set up the voice/fax
channel for a local interface of FXO and a remote interface of FXS. Configure the home office
unit for DTR dialing of the main office DataTalker, a local interface of FXS, and a remote interface
of FXO.
You must configure the DataTalkers before you connect them to the computers. To configure a
DataTalker, place DIP switch position 3 in the down (closed) position and connect a command
port device such as a terminal or a PC to the DATA/COMMAND connector on the back of the
DataTalker. Turn on the DataTalker and PC and run your communications software in terminal
mode. (Set it for direct connection at a serial port speed of 19,200 bps or slower.) Press the
ENTER key to establish communications with DataTalker and see the Main Menu.
A series of configuration menus provides simple and complete configuration information for each
aspect of the DataTalker. Using the menus, we will configure one DataTalker for the main office
and the second one for the home office.
The menus flow from the Main Menu through the Configurations menu to configuration menus for
specific parts of the DataTalker. From the Configurations menu you will use the first menu to
configure the data port of the main office unit to talk to the host computer, and that of the home
office unit to talk to the async channel of the home office PC. You will use the next one to
configure the voice/fax channel for connection of the main office DataTalker to an extension of
the local PBX, and the home office DataTalker to your telephone and your local telephone
service. You will use the final group of configuration menus to set up the internal MMH2834
modem to dial the main office from the home office and for the main office to answer the call.
As you go through these configuration menus, you must supply the specifics of your
configuration.