Multi-Tech Systems DT101/xx, DT102 Product Description, +++Atcr, DataTalker Owner’s Manual

DataTalker Owner’s Manual

1.3 Product Description

The DataTalker series of multiplexers has a single synchronous or asynchronous data channel, a command port, one or two voice/fax channels, and a single synchronous composite link with an internal data service unit (DSU), modem, ISDN terminal adapter, or an external synchronous link device. The DataTalker can be connected to an asynchronous device such as a PC or host computer, an external synchronous device such as a LAN router, or the composite link of an MMH900 series MultiMux. It also can be connected to telephone equipment for voice or fax traffic over your standard composite link. The DataTalker’s data port allows either synchronous or asynchronous devices to be connected to it. The command port allows you to configure your data channel, composite link, and voice mode of operation. The composite link can be configured for an internal 28.8K bps dial-up/leased line modem, an internal DSU for digital communications over a digital data service (DDS) network, or an ISDN terminal adapter for Basic Rate Interface Service. It can also be configured for external synchronous link devices. The voice/fax channel supports phone, fax, or key telephone system equipment through an FXS interface, a PBX station-side connection through an FXO interface, or a PBX trunk connection through an E&M interface. The DT101/V34 and DT102/V34 DataTalkers are dual-function models. If the user requires traditional data communications, these models provide a simple switch to enable a standalone V.34 modem mode, which supports dial-in/dial-out data communications for Internet, BBS, and other on-line access.

EPROM

AT Commands

Configurations

C	Composite
o
	Link
m

PSTN

Data/

Command

Channel

Trunk	E&M
Trunk

Trunk

Station

Station

FXO

PBX

FXS

Fax/Telephone

I/O Data/Command

Processor

RAM

Analog

Channel 1 to

CODEC Digital

A to D	Digital
	Signal
D to A
	Processor

Digital

to

Analog

Serial

Communications

Controller

Port

RAM

Digitize

Voice/fax

RAM

EPROM

Modem,

DSU, or

Terminal

Adapter

p	L
	i	PDN
o	n
s	k
i

t

e

Figure 1-2. Block Diagram

A simplified block diagram of the DataTalker is shown in Figure 1-2. The data channel on the top left and the voice/fax channel on the bottom left feed data to a serial communications controller that provides the path through a modem, DSU, or ISDN terminal adapter to the public data network. The data channel, voice/fax channel, and the serial communications controller are on the main printed circuit board. The internal modem, DSU, or terminal adapter is a daughter board that plugs into the main board. The data/command channel is a dual purpose channel to which a synchronous or asynchronous device can be connected when it is used in its data mode. The voice/fax channel allows you to connect a telephone, a PBX (Private Branch eXchange) extension, or a PBX E&M trunk for voice or fax communication. On the other end of the DataTalker, an internal 33.6K bps modem, 56K bps DSU, or ISDN terminal adapter provides the composite link interface to the public data network.

The data/command channel can have a terminal or PC connected to it for configuring the DataTalker. The versatility of the data/command port allows the DataTalker to be connected to a synchronous or asynchronous device in the data mode or to an asynchronous device in the command mode when the DataTalker needs to have the configuration of the data channel, voice/ fax channel, or the composite link changed. The data/command channel can be switched between data and command modes by setting a DIP switch. If the data/command channel is in data mode, it is also possible to switch to command mode by entering the escape command

+++AT<CR>.

Before you can transfer data over the channel, you must connect a terminal or PC running

10