SPA400 Field Reference
Setup
SPA9000 Voice System Administration Guide
266
C
Line Settings
Transmit Gain
The gain level that the SPA400 may use to increase or
attenuate the power level before transmitting to the
telephony port
NOTE
Change this setting if remote call participants have
trouble hearing the users of the SPA9000 Voice System. Make
changes in increments of 3 dB; changes of less than 3 dB will
not have a perceptible impact.
Default:
0
Receive Gain
The gain level that the SPA400 may use to increase or
attenuate the power level before receiving on the telephony
port
NOTE
The default Receive Gain settings should be
satisfactory in most use cases. Unnecessary changes in
Receive Gain can cause problems with echo.
Default:
0
Impedance
The impedance of the lines that are connected to SPA400’s
telephony ports
Default:
600 Ohms
Tip/Ring voltage
The tip-to-ring voltage reserved for voice transmission
Default:
3.5 Volts
Operational loop
current Min
The minimum loop current that maintains an off-hook state. If
the loop current drops below this value, the phone enters on
hook state.
Default:
10 mA
On-Hook speed
The time that the loop current drops to 0mA when the phone
enters the on-hook state.
Default:
Less than 0.5ms
Ring frequency Min
The minimum frequency of a valid ring
Default:
10
Ring frequency Max
The maximum frequency of a valid ring
Default:
100
Ring Validation Time
The minimum duration of a valid ring
Default:
256ms
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