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Multiplex 4 or 8 async
subchannels onto one
sync channel.
Send async data
at 19.2 kbps over
composite sync link.
Demux data at remote
end and distribute data
to users at a preconfigured baud rate.
Easy to configure with
standard CRT or an
IBM
®
style PC.
User-selectable
hardware and
software flow control.
Local and remote
loopback options.
Settings stored in nonvolatile memory.
T
hese advanced, full-function
devices make multiplexing
data lines from terminals to a host
computer both simple and
economical.
Compact and rackmountable,
the Stat-4 and Stat-8 Modular
Statistical Multiplexors enable
you to multiplex asynchronous
data subchannels onto a single
straight composite synchronous
channel at speeds up to 19.2 kbps.
The Modular Statistical
Multiplexors do this by statistically
multiplexing subchannel data to
form a composite data stream that
has a rate much smaller than the
arithmetical sum of the individual
subchannel rates. The composite
data then travels via sync modems
to the remote Stat-4 or Stat-8,
which demultiplexes and
distributes the data to the local
users at their preconfigured rate.
The Stat-4 has four
subchannels, and the Stat-8 has
eight subchannels. In addition to
the modular, front-panel RJ-45
ports for your subchannel links,
Connect four or eight async
devices over a single sync link.
Key Features
MODULARSTA TISTICALMULTIPLEXORS (STA T-4 & STA T-8)
each Modular Statistical
Multiplexor has a standard DB25
male port for the composite
channel. You will need modular
adapters to convert the
subchannels’ RJ-45 ports to SB25
for most applications. Once
adapted, the DB25 connector is
configured as a DCE device.
Because the interfaces for the
subchannels are configured as
data communication equipment
(DCE) interfaces, you can connect
the Modular Statistical Multiplexors
via pinned RS-232 port cables
directly to data terminal equipment
(DTE).
The composite channel, which
is configured as a DTE interface,
connects to a sync modem, which
provides the clock signal that
automatically determines the
composite channel‘s data rate.
The Stat-4 and -8 muxes use a
dynamic data buffer management
technique to allocate available
buffer capacity according to
subchannel activity. The muxes
ensure error-free end-to-end data
transmission by using powerful
and efficient error detection and
automatic retransmission
technology.
All of this is done completely
transparent to the user. In fact, in
most instances, the Stat-4 and -8
operate unattended. Operator
intervention is only required when
the mux is set up for the first time
or when it‘s adapted to new
operational requirements.
Efficient flow control.
For reliable operation of any
statistical multiplexor, you’ll likely
want some form of flow control for
the equipment connected to the
subchannels.
The Stat-4 and -8 give you this
and more, providing independent
hardware and software flow
control for each subchannel—
both end-to-end flow control (DTE
to DTE) and terminal flow control
(DCE to DTE). The method of flow
control that you use at each of the
two ends can differ—that is, you
can use hardware control at one
Black Box Corporation • 1000 Park Drive • Lawrence, PA 15055-1018 • Tech Support: 724-746-5500 • www.blackbox.com • e-mail: info@blackbox.com
© 2004. All rights reserved.
Black Box Corporation.
10/6/2004 #11842
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Approvals: FCC Part 15, UL
®
Buffer Size: 32K
Clocking: Derived from external
modem clock
Data Format: Subchannels:
Asynchronous;
Composite: Synchronous
Diagnostics: Local and remote
loopback on subchannel and
composite lines
Flow Control: Hardware or software
X-ON/X-OFF
Multiplexor Type: Statistical
multiplexor
Maximum Speed: 19.2 kbps
MTBF: 70,000 hours
Interface: RS-232
Connectors: Subchannels:
(4) or (8) RJ-45;
Composite: (1) DB25 M (DTE)
Indicators: LEDs: Main and Channel
Activity; Test; Error; Sync, OVF,
and Power
Temperature Tolerance: Operating:
32 to 114ºF (0 to 46ºC);
Storage: -40 to +176ºF
(-40 to +80ºC)
Humidity Tolerance: Up to 95%,
noncondensing
Power: Internal 100–115 VAC, 47–
63 Hz, 4 W
Size: 1.7"H x 8.5"W x 9.5"D
(4.3 x 21.6 x 24.1 cm)
Weight: MX864A: 3.1 lb. (1.4 kg);
MX866A: 3.5 lb. (1.6 kg)
Specifications
Ordering Information
ITEM CODE
NOTE: Must be used in pairs.
Modular Statistical Multiplexors
Stat-4.........................................................................MX864A
Stat-8.........................................................................MX866A
NOTE: If you need rackmount ears, call Tech Support.
For your async RS-232 channel connections, you may
need…
Modular Adapter Kits
DB25 Male↔RJ-45 (8-Wire)....................................FA015
DB25 Female↔RJ-45 (8-Wire)................................FA016
end and software control at the
other end.
And to make the muxes
compatible with most applications,
you can choose from several
software flow-control characters.
Menu-based setup.
Setting up a Stat-4 or -8
Modular Statistical Multiplexor
isn’t a time-consuming task. Three
internal jumpers are set to default
parameters that provide you with a
common starting point during initial
system startup.
To configure the mux for
operation in your particular system,
simply access the mux‘s menudriven, password-protected
configuration program, which runs
on a standard CRT terminal or IBM
style PC using a terminal emulator
program that you connect via any
of the mux’s subchannel ports.
Through the program’s
configuration menus, select the
subchannel characteristics and
other system features you require.
Configure local channels, view and
change subchannel baud rates,
data bits, stop bits, and parity.
Configuration parameters store
in non-volatile memory and are
immediately available upon powerup.
Easy to monitor and troubleshoot.
The Stat-4 and -8 muxes also
feature comprehensive diagnostics
functions, including automatic selftest upon power-on, local and
remote subchannel loopbacks,
and local and remote composite
channel loopbacks.
You can also control the V.54
pins (Pins 18 and 21) of the
composite port’s RS-232 interface.
This is helpful when you want to
control the analog and remote
digital loopback functions of the
modem connected to each mux.
Front-panel LEDs show the
condition of each subchannel and
the synchronization status of the
composite link. Subchannel activity
indicators flash according to the
traffic load and darken when the
corresponding subchannels
become idle. These indicators not
only enable you to identify channel
and link status, but they help alert
you to any system faults.
The Modular Statistical
Multiplexors operate in one of three
modes: Normal Mode, Parameter
Configuration Mode (for setting up
the parameters of local and remote
muxes), and Diagnostics Mode
(which you use to send local and
remote loops on each subchannel
and the composite channel and to
send modem loops).
Both
muxes
can be used on
the desktop or installed in a 19"
rack. A special rack adapter kit
with rackmount ears is available
by special order. The kit includes
brackets that attach to the side
walls of the unit and enable it to
be installed within a rack’s rails.
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