Product Description - Multitech MMH900 User Manual

1.4

Product Description

There are two basic models of MultiMux MMH900 series available: a
four channel and eight channel units with internal command modem,
optional composite link modems and a command port. The four channel
MultiMux MMH904 connects four async devices to asynchronous
channels that transfer data at a channel speed of up to 38.4K bits per
second (bps). The eight channel MultiMux MMH908 connects eight
async devices. The composite link of the MultiMux MMH900 series can
be configured for various dial-up and lease line modems, a Digital
Service Unit (DSU) for digital communications over a Digital Data
Service (DDS) or dedicated network, or an ISDN terminal adapter for
Basic Rate Interface Service. The command port allows you to
configure the MultiMux MMH900 series for your channel configuration,
internal hardware and composite link configuration.
A simplified block diagram of a MultiMux network is shown in Figure 1-3
to give you a pictorial view of a complete network. The MultiMux
represented in the figure is a MultiMux MMH904 connected to four async
devices on CHANNEL 1 through CHANNEL 4. The workstation
connected to the COMMAND PORT is the supervisory console in which
you can communicate with the command processor or command
modem. If a remote connection is needed to the command modem, a
separate DIAL-UP connection is provided. The composite link can be
configured for an internal 28.8K bps dial-up/leased line modem, 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 device with either
V.24 or V.35 interface.
Channel
4
I/O
Channel
3
Channel
Data
Channel
2
I/O
Channel
1
ATCommands
Command
Port
Workstation PC
Figure 1-3. MultiMux MMH900 Series Block Diagram
To setup a MultiMux MMH900 series, the async devices have to be
connected to the channels, the composite link connected to the public
data network (PDN) and the MultiMux has to be configured for the
Chapter 1 - Introduction & Description
Composite
Link Data
C
Dial-Up Modem
Dial-Up Modem
Data o
Processor m L
p i
Lease Modem
AT Commands
o n Lease Modem
Channel
s k
Data
i
DSU
Digital
t
Command
e
Processor
AT Commands
AT Commands
Command
Dial-up
Modem
MultiMux 900 Series
Composite
Composite
Link
Link
PDN
Dial-up
Dial-up
Line Line
PDN
Workstation PC
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