Amron Amcom II 2825R-7002, Руководство пользователя, Страница: 33 / 47

2825R TWO DIVER RACK MOUNT COMMUNICATOR USER MANUAL
2825R-UM REV 3.0
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7 FULL DUPLEX (4-WIRE) - WHAT, WHY AND HOW
Amron has designed the AMCOM Full Duplex (4-WIRE) mode from the ground up, taking advantage
of state-of-the-art electronics technology to provide a superior hard wire communication experience.
Full Duplex (4-Wire) mode has the following advantages:

Up to 285% more signal strength from the diver microphone over the 2-Wire mode using standard
8-Ohm microphones.

No push-to-talk required leaving the tender's hands free for other tasks.

The diver and tender can hear themselves talk providing a more natural communication
experience.
These advantages produce superior communications and the system is easier to operate by
eliminating the need for using a push-to-talk switch. Another advantage is that the system is easy to
troubleshoot. In fact it is easier to troubleshoot than 2-Wire system once you understand what is
happening. Full Duplex (4-Wire) mode pays off in better communications, something that many of our
competitors have yet to achieve. Better communications means higher diver production, safer dive
conditions and less down time.
7.1 What Are 2-Wire And 4-Wire Modes?
7.1.1 2-Wire Mode
2-Wire mode is the most commonly used communication mode in the commercial
diving industry. Technically it is defined as a single communication path using a
minimum of 2 wires in a communication cable. Being a single path, there can only
be one talker at a time. Commonly the diver has the priority and the tender listens
as the diver talks. In order for the tender to talk to the diver, this communication
path has to be reversed. This is done by the tender pressing a push-to-talk switch.
This switch activates a set of relays that switch the diver connection to the output
side of an audio power amplifier and the tender connection to the input side. This
allows the tender to talk while the diver listens.
Most diver communication cables, such as the "Army surplus Comm-Cable," have
four wires. These four wires are often separated into two sets of twisted-wire pairs.
In many diving operations, these two sets of twisted-pairs are connected in parallel
for redundancy. A breakage in a single wire in the cable does not cause a loss of
communication, as each wire has a parallel wire to take over. This arrangement is
still a 2-Wire mode even though 4 wires are being used.
7.1.2 4-Wire Mode
4-Wire mode uses two communication paths: an uplink from the diver to the tender
and a downlink from the tender to the diver. This allows voice communications to
go in both directions at the same time. An example of this type of communication
system is the telephone. Another example is called Round Robin communications.
Amron's Full Duplex (4-Wire) is not the same as Round Robin.