12
DHY-03 User Handbook
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Figure 2-3 : Configuration Settings Switches.
Noise Gate Select - SW1 {ON}
An output noise gate operates when the telephone signal is below the noise gate threshold
control. This noise gate reduces the output gain by 34dB during low level signal conditions.
This eliminates the effects of telephone line cross talk. The noise gate can be switched off if
you don’t wish to use it by switching SW1 to the off position.
Ducking Enable - SW2 {ON}
This switch allows the received signal to be automatically attenuated by 18db when both
received and sent audio are present in the hybrid. This allows an operator in the studio to
talk over the caller at all times.
Auto Disconnect Enable - SW3 {ON}
When SW3 is enabled (ON) the DHY-03 will automatically disconnect from the telephone
line by detecting appropriate disconnect regime selected for the specific country according
to the selected country code
(see Table 2-2). Line reversal and K-break work by changing
the voltage on the line and have parameters settings which indicate a duration range for
which this voltage change must be present. Tone detection has a more complicated and
extensive parameter set. A variety of single or dual tones with level control are available
together with the ability to handle cadence patterns, where known countries disconnect
requirements are preset, but if not the ETSI default of 400Hz tone is used. These parameters
can be defined to use standard tones or the user sets which are set via the serial port.
You may need this capability if your telephone system provides non-standard call
progress tones.
Ring Detector (Auto Answer) Enable - SW4 {ON}
This switch enables the integrated ring detector, which automatically answers incoming
calls after the number of rings set in parameter 5 (see page 26). The default is 3 rings.
Note double cadence ring tones will count both rings in the cadence pattern.
CONFIGURATION & CONTROLS
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Noise G
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Enable
1 2 3 4 5 6 7 8
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OFF
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Canc
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Enable
Aut
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Enable
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Enable
D
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Unused