NXU-2B Operations Manual
2-5
Interoperability Now!
2.5.2
E&M Return Selection
When the PTT source is set to use the internal relay, the user may select either an internal
GROUND as the return or an external pin on the Audio/Control jack as the return. This is for
E&M applications where some PTT reference other than ground may be desired. To select the
internal GROUND reference place J13 (E&M Return) in the Ground position. When an
alternative reference is desired place J13 in the AUXIN0 position and place J15 (AUXIN0 Pin
Function) in the E&M Return position. The desired E&M return voltage may then be applied to
the AUXIN0 pin on the Audio/Control jack.
2.6
Power Requirements
The NXU-2B is designed to operate from a n12V DC supply. The unit will meet all of
its specifications over a voltage range of +11 to +15 VDC and will be damaged by a DC source
that delivers a constant (non-transient) DC voltage above this range. The DC power consumption
is 500 mA maximum. The AC adapter provided with the unit meets these specifications.
The NXU-2B is a microprocessor-controlled device. As with any such equipment, a very short
loss of power can cause operational problems and/or cause the unit to reset. The communications
link will be inoperable during the reset period. JPS recommends the NXU-2B and associated
equipment be connected to an AC power source that utilizes an uninterruptible power system
(UPS). If the overall site does not have UPS capability, the NXU-2B should be plugged into a
smaller UPS, such as those used for personal computer systems
2.7
Installation Checklist
Table 2-2
Basic Installation Checklist
Determine NXU-2B network parameters such as
IP address, subnet mask, and gateway address.
You must assign these values. If you are not sure how to
determine these values, see the network administrator for
your organization.
Provide suitable power for the device.
See section 2.6 Power Requirements.
Configure NXU-2B parameters.
See Section 3 Configuration.
Adjust audio levels.
See Section 4.4.2.
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