Audio Level Adjustment
b. If the automatic receive level adjustment fails, a note will appear saying “An
input signal was not detected.” If this occurs, double check that the tone is
being sent to the right Gateway, Link, and receive input, and that the web
browser is showing the matching web page for the Gateway and Link.
3. If it is not feasible to provide a constant tone to the receive audio input, but the
approximate level of the input signal is known, then you may directly enter the
desired gain into the Receive Gain box on the Level Adjustment page. To make
the entered value take effect, click the adjacent Apply button. The target internal
level is -13 dB0 for 60% of maximum RMS voice level. Use one of the two
following formulas to determine the Receive Gain based on the known input
signal.
• To calculate receive gains for a balanced input sine wave level in dBu RMS,
use the following formula where x is the known input signal and y is the
value to enter into the Receive Gain text box:
()()
yx =−×− 14
For example, with a known input value of -10.0, subtract 4 for -14.0, and
multiply by -1 for 14.0.
()()
0.141410 =−×−−
• To calculate receive gains for balanced input speech level in dBu RMS, use
the following formula where x is the known input signal and y is the value to
enter into the Receive Gain text box:
()()
yx =−×+ 12
For example, with a known input value of -10.0, add 2 for -8.0, and multiply
by -1 for 8.0.
()()
0.81210 =−×+−
4. After the receive level has been set, click the Save button on the Link Level
Adjustment page. This may result in the Gateway rebooting, which is normal.
Also remove the tone signal from the receive audio input.
5. If the linked pair will be used in the reverse direction as well, then repeat the
above steps by reversing the links so that the former Sending Link becomes the
new Receiving Link, and the former Receiving Link becomes the new Sending
Link.
Transmit Level Adjustment
♦ To adjust the transmit level
1. With a PC, use its web browser to navigate to the IP address of the Sending Link
and to the correct Link Level Adjustment web page (Link 1 for a Model 6301,
or Link 1 or 2 for a Model 6302).
50 025-9631D.1
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