Instruction manual

ACU-1000 Operations Manual
Interoperability Now 5-1
5 ACU-1000 Technical Information
5.1 Scope
This section contains technical information for the ACU-1000 system and its various plug-in
modules. Specifications and block diagrams are provided for each of the interface modules.
This information is intended to provide a basic understanding of each module to allow
troubleshooting to the module level and to allow the development of applications for the ACU-
1000.
5.2 General Description
The ACU-1000 system is a modular interface/interconnect system packaged in a Eurocard
chassis. With this product, an intelligent interconnect system can be configured to meet almost
any interface application involving telephones and radios of any sort. The ACU-1000 system is
suitable for HF, LMR, Nextel, and Inmarsat Satcom systems and offers essentially unlimited
applications and expandability. A system consists of a chassis, backplane and modules, module
software and system control software.
5.3 Card Cage and Backplane
The Card Cage is a 19” wide EIA standard rack-mounted Eurocard cage equipped with a
backplane board into which the modules are plugged. The modules PC Boards are 100 x 220
mm. The card cage height is 5.25” (3U) tall, 19” wide, with a depth of 11”. An AC input
module and power transformer assembly is located on a metal panel that is mounted to the
backplane. The AC module is a combination AC line filter, power cable connector, input
voltage selector and fuse holder. The backplane interfaces the outside world via D-
subminiature connectors, and internally to the plug-in modules via 60-pin card edge connectors.
No active or passive electrical components reside on the backplane board.
5.4 Power Supply Module
The Power Supply is a single-board module that plugs into the left-most slot in the backplane.
The power supply’s backplane connector is offset relative to the connectors for the other boards
to prevent improper insertion of the Power Supply Module in the slots reserved for the other
cards. In turn, these other modules cannot be plugged into the Power Supply slot. The power
supply incorporates a dual-primary line transformer with a bridge rectifier and filter capacitors
to provide a +15V unregulated DC bus. The bus feeds a linear regulator that supplies all
modules with +12VDC, and the bus feeds a switching regulator that provides -12VDC. Each
individual module contains a switching +5V regulator operating from the +15V bus.