ClearOne XAP TH1 - Manual (Page 15)

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DIP Switch 7, Receive Reduction
In some applications, it may be necessary to duck the receive audio
coming in through the telephone line when transmit audio is present. To
serve this purpose, DIP switch 7 is designated to duck the receive audio
by -6dB, if active (Table 7, below).
Table 7. Receive Reduction DIP Switch Settings
DIP Switch Position Description
7 ON (UP) Receive reduction enabled
7* OFF (DOWN) Receive reduction disabled
INSTALL ATION & OPERATION • CALIBRATION
The following information will help you make adjustments to optimize
your system performance. Verify all components and all connections.
Ensure that proper power is supplied to the XAP TH1 and that the unit is
OFF (the red OFF LED [4] will be lit; see Figure 9, below). If the green
ON LED [3] is lit, press the OFF button [6].
There are two calibration methods for the XAP TH1: noise burst and
auto-adapt. Which procedure is used depends on whether you have DIP
switch 1 ON (UP) for noise-burst adapt, or DIP switch 1 OFF (DOWN) for
auto-adapt. Either will suffice to calibrate the XAP TH1. The difference is
the application and/or personal preference. Some applications are not
suited for a .75-second noise burst, and may require the gradual
adaptation over time.
Noise-Burst Adapt
If DIP switch 1 is ON (UP), have someone call the XAP TH1 from another
location. Answer the line by pressing the ON button [5]. (If the auto-
answer feature is active, the unit will answer the call after one complete
ring.)
The caller will hear a short white noise burst (it will sound like static) and
a short beep. This automatically adapts the XAP TH1 to the telephone
line.
Transmit Transmit Receive Receive On Off Transmit Receive
1 2 3
4
5 6
H A P T 1
Calibration
Figure 9. XAP TH1 front-panel controls
Some echo and ringing may
be heard while the XAP TH1
is calibrating. Disregard it
and continue with calibration until
the end of the procedure. The echo
and ringing will disappear.
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