Polycom C16 - Manual (Page 396)

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12
A - 54
pstn_line_voltage PSTN Line Voltage
Description
This parameter indicates the line voltage (in Volts) of the PSTN interface. The
value is valid in both on-hook and off-hook modes. The value can be positive
or negative, indicating the polarity of the tip/ring voltage. When the value
changes sign, it indicates that a polarity reversal has occurred.
Examples
pstn_loop_current PSTN Loop Current
set pstn_in_gain "Phone
In" 6 val pstn_in_gain "Phone
In" 6 Adjusts the input gain on the phone input to 6dB. Note
that the phone in virtual channel name must be used, not
the phone out virtual channel name.
Argument Argument value
Channel Type Virtual Channel
Value Type Integer
Read/Write Mode Read-Only
Phys Chans Analog Telephony Output
Virt Chans Mono
System Limits Minimum: -128, Maximum: 128
Command Response Description
get pstn_line_voltage
"Phone Out" val pstn_line_voltage
"Phone Out" 0 Queries the pstn_line_voltage and returns the measured
value in Volts on the phone line "Phone Out". Note that
the phone out virtual channel name must be used, not the
phone in virtual channel name.
Argument Argument value
Channel Type Virtual Channel
Value Type Floating-Point
Read/Write Mode Read-Only
Phys Chans Analog Telephony Output
Virt Chans Mono
System Limits Minimum: 0.0, Maximum: 281.6, Resolution: 0.1