Amron 2810E-2001, User Manual, Page: 17 / 31

MODEL 2810E-2001 USER MANUAL
2810E-2001 UM REV 3.0
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WARNING!
Surges and spikes are common on AC lines found onboard ships, from local generators, or at the end of
a long extension lines. These spikes can exceed 1kV! Such spikes can be high enough to cause the
input fuses on the 2810E-2001 internal battery charger to blow and, in extreme cases, actually damage
the charger circuitry. Amron has designed this battery charger to isolate such faults to ensure that they
will not cause a safety issue for the operator or chamber occupants. Amron strongly recommends that
the 2810E-2001 be operated on AC circuits protected by a Ground Fault Circuit Interrupters (GFCI) for
additional safety.
MODES OF OPERATION 4.3
The 2810E-2001 has the ability to operate in either 2-Wire or Full Duplex (4-Wire). Both the
operator and chamber occupants can be connected in either mode or a combination of
modes can be used. For example, the chamber can be connected in Full Duplex (4-Wire)
mode to take advantage of the new entertainment feature while the operator is wired in 2-
Wire mode. If either the operator or the chamber is wired in 2-Wire mode, the operator must
use a push-to-talk, either the PUSH-TO-TALK BUTTON or PUSH-TO-TALK JACK, when
talking to chamber occupants.
2-Wire communication is defined as a single communication path; normally a chamber
occupant is the priority signal path, the operator listens to the occupants. Signal reversing is
accomplished by pushing the PUSH-TO-TALK BUTTON, the occupant hears the operator.
Often times a 4-conductor communication cable is used with 2 wires tied together as a pair
for redundancy, this is still a 2-Wire system. Since only one person can talk at a time, there
is a level of discipline that goes with using 2-Wire mode in order to obtain clear
communication. One advantage of 2-Wire is that the operator's microphone is not active
unless one of the two push-to-talk controls, PUSH-TO-TALK BUTTON or PUSH-TO-TALK
JACK, are active. This eliminates any possible acoustic feedback between the operator's
microphone and the PANEL SPEAKER. It also prevents noise from the outside reaching
chamber occupants and allows the operator to communicate with other members of the
chamber operations crew without involving occupants. If the chamber is connected in 2-
Wire mode, the AUDIO AUXILIARY INPUT cannot be used to deliver entertainment to the
occupants.
Full Duplex (4-Wire) communication is defined as a dual communication path, a signal path
(a pair of wires) for up-link and a signal path (a pair of wires) for down link. A common
example of Full Duplex communication is the telephone. Full Duplex (4-Wire) has the
advantage of natural communication without having to use the PUSH-TO-TALK BUTTON.
This keeps the operator's hands free to perform other task. It does not require the same
level of discipline to achieve clear communications that 2-Wire does. It has the advantage
that neither a chamber occupant nor the operator is cut off when the other is talking.
Because the chamber microphone is not connected in parallel with the chamber earphone,
the occupant is louder and potentially clearer in Full Duplex (4-Wire) mode.