NXU-2B Operations Manual
3-7
Interoperability Now!
3.3.17
RX Delay
Additional delay may be provided to the receive audio path. As much as 5 seconds of delay may
be introduced, specified in 1 mS increments. Upon editing the field with numeric data, the NXU-
2B will round to the nearest 100mS interval. When additional delay is used, the received audio
will be delayed before being sent to the network, relative to when the NXU-2B sends an “Active
COR” valid audio signal, which is not delayed.
3.3.18
TX Output Level
The desired transmit output level in dBm. The unit will send any standard audio at the set level,
assuming the receive audio level is set correctly on the remote unit that the NXU-2B is
connected to.
3.3.19
TX Delay
Up to 5 seconds of delay may be introduced to the transmit audio path, in 1 mS increments. Upon
editing the field with numeric data, the NXU-2B will round to the nearest 100mS interval. When
additional delay is used, active PTT will be asserted prior to the delayed audio being presented.
For example, this may delay the TX audio in LMR trunking systems to be delayed until after the
“Channel Acquisition Time” and thereby preventing a loss of initial syllables.
3.3.20
Duplex
The NXU-2B allows full-duplex audio operation where audio can be received and transmitted
at the same time. In some applications this is required or helpful, but in other applications this
may not be desirable. For example, if the system echoes back the transmitted audio to provide
sidetone monitoring the resulting audio will be slightly delayed. Listening to a delayed version
of your own voice can be distracting, and in such cases it would be better to use half-duplex
audio. Most radios are half-duplex.
3.3.21
COR Priority
The COR Priority determines whether the NXU-2B responds to valid audio from the network
or from the associated radio, if valid audio is simultaneously presented at both interfaces.
3.3.22
COR Inhibit Time
In some applications it may be necessary to inhibit the NXU-2B’s response to the COR input
(whether hardwired COR or VOX) for a brief period of time (and under certain circumstances)
in order to avoid problems with the “ping pong” effect.
The “ping-pong” effect can occur when the COR output of a device is inappropriately and
momentarily activated by the device when it switches out of the transmit mode. There are
varieties of reasons why this can happen (including squelch tails on some radios), and it may
occur with COR or VOX, but the result is the same.
To illustrate the problem, assume that there are two radios connected over a network by a pair of
NXU-2Bs. An active COR at one end of the network creates an active PTT at the other end.
When the COR of Radio 1 is active, Radio 2 is transmitting, and vice versa. Consider what can
happen when the cessation of the TX mode causes a momentary active COR output:
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