Instruction manual

ACU-1000 Operations Manual
1-6 Interoperability Now
Essentially, the information required to create a cross-connection can be broken down into the
following:
 The equipment interfaced to the person talking provides the following information to
the ACU-1000:
o The person’s speech. (The RX Audio in the figure.)
o A control signal that indicates when this person is talking. (The COR signal in
the figure.)
 The ACU-1000 provides the following information to the equipment interfaced to the
person listening:
o The speech signals of the person talking. (The TX Audio in the figure.)
o A control signal that tells when that person is talking. (The PTT Signal in the
figure.)
During a conversation, these roles switch back and forth as each person moves between being
the talker and being the listener.
Most radio systems are either simplex or half duplex; the important aspect to remember is that
only one person can be heard at a time. With full duplex systems, all parties to a conversation
may be heard simultaneously. A telephone system is a good example of a full duplex system.
The ACU-1000 can accommodate both types of systems, but both parties of a conversation
must be using full duplex equipment for either party to be able to simultaneously talk and
listen.
COR: A signal that tells when a radio (or other communications device)
is receiving a valid signal.
PTT: A signal that tells a radio (or other communications device) that a
valid signal is being sent to be transmitted.
Full Duplex: System Users can simultaneously talk to and listen to other
parties of the cross-connection.
Simplex or Half Duplex: Only one system user can be heard at a time.
This scenario can be a bit more complicated for some communications devices other than
radios, but the job of the ACU-1000 is the same: to take the incoming audio and control
signals from one communications medium, translate these signals into the proper outgoing
control signals for another communications medium, and send out these signals along with the
original received audio.