4RF Aprisa XE, Руководство пользователя

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Configuring the traffic interfaces | 105
9.
Set the DFXO Loop Current Limiter.
This option turns on a current limiter which limits the maximum current that can be drawn from the
exchange line card by the DFXO interface.
As a general rule, only one interface should current limit so if the exchange interface current limits,
the DFXO interface should be set to current limit off.
Selection Description
Off Use if the exchange line interface uses current limiting. Default
On (60 mA) Use if the exchange line interface does not use current limiting. The
DFXO limits the line loop current to 60 mA.
Note: The DFXO provides an early warning over current alarm ‘fxoCurrentOvld’ if the loop current
exceeds 100 mA for 2 seconds. This alarm clears when the loop current is less than 90 mA.
The DFXO also provides an over current safety shut down limit which removes its line loop if the
loop current exceeds 160 mA.
10.
Select the DFXO Billing Tone Frequency.
This option sets the frequency of billing tone detection. If you are not sure what the expected
frequency of the billing tone should be, check with the exchange equipment supplier.
Selection Description
12 kHz Use if the exchange outputs 12 kHz billing tone
16 kHz Use if the exchange outputs 16 kHz billing tone Default
11.
The DFXO Billing Tone Advanced sets the billing tone Bandwidth and the billing tone Level
Sensitivity.
The DFXO billing tone Bandwidth determines the bandwidth of the band pass filter that is used by
the billing tone detector in terms of +/- % of the billing tone frequency.
The adjustment range is +/- 1.5% to +/- 7.5% and the default value is +/- 5.0%.
The DFXO billing tone Level Sensitivity determines the DFXO detection sensitivity.
The adjustment range is 0 dB (metering detection threshold of -17 dBm measured across 200
Ω
)
to 27 dB (metering detection threshold of -40 dBm measured across 200
Ω
) in 1 dB steps and the
default value is 0 dB.