Instruction manual

ACU-1000 Operations Manual
1-4 Interoperability Now
• CPM-4 Module: The Control Processor Module receives control commands from the
unit’s operator. The commands may be entered via the HSP-2A’s keypad, or (more
efficiently) by either the ACU Controller or WAIS Controller programs. The ACU
Controller may be connected directly to an individual ACU-1000 or it can monitor and
control the unit over an Ethernet network. The WAIS Controller is intended to monitor
and control multiple ACU-1000s and other communications assets that make up a Wide
Area Interoperability System, all connected to an IP-based network.
Earlier version CPM modules (the CPM-2) do not provide any network functionality.
• DSP Module: This module interfaces radios and other 4-wire devices to the ACU-1000
via a rear panel D-15 connector. The DSP-2 also has a front panel RJ-45 connector that
allows it to create a network VoIP link. The DSP modules labeled “A” and “B” are
interfacing radios to the system, while the module labeled “C” is connected to the
network. Each DSP-2 can create either a radio interface or a talkpath to the network, but
not both at the same time. See Figure 1-1.
• PSTN-2 Module: Interfaces the ACU-1000 to telephone or satellite systems.
• LP-2 Module: The LP-2 allows a standard telephone set to be interfaced to the system
using a standard phone cord.
Note the difference between the LP-2 and the PSTN-2. While the LP-2 interfaces an
individual telephone set, the PSTN-2 interfaces an entire system such as a landline with
service or a cellular system. Connections to each are made with standard phone cords with
RJ-11 connectors. The phone cord of the LP-2 is plugged into a telephone set, while the
PSTN-2 phone cord plugs into the telephone wall outlet. The PSTN module can also be
used to interface cellular phones and some satellite phones.
Radios, audio consoles, and similar equipment are 4-wire devices and interface to the ACU-
1000 via the DSP module. 2-wire telephone systems equipment that provide loop current
and ringer voltage such as a PABX or telephone central office interface via the PSTN
module. 2-wire devices that require loop current and ringer voltage to operate, such as a
telephone deskset, interface via the LP-2 module. The LP-2, in effect, simulates the
telephone system to the target 2-wire device by providing loop current and ringer voltage.
A 4-wire device is one that has separate lines for transmit and receive
audio signals. One pair for TX, and another for RX, totaling four wires.
A 2-wire device carries both the transmit signal and the receive signal
on the same pair of wires.
1.4.1 Cross-Connection Basic Explanation
When an operator uses the ACU Controller or the WAIS Controller to cross-connect two
CSAPs at an ACU-1000, a command is issued to the associated ACU-1000 CPM module. The
command instructs the CPM to tie the appropriate interface modules together as in the figures
that follow. Only after the command is successfully completed (and a status message returned