FXS Line Testing

You can test FXS telephone lines that are connected to the device's FXS ports. The test is done per FXS port and FXS country coefficient type - USA (70) or TBR21 (66). The output of the test displays various line statuses and electrical line measurements. Some of the supported FXS status and line measurements include:

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Hazardous Potential Tests (HPT) - hazardous AC or DC voltage is present on the tip and ring or both.

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Foreign Electromotive Force Tests (FEMT) - foreign voltage is present on the tip, ring or both

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Resistive Fault Tests (RFT) - tip or ring is shorted to ground, or they are shorted to each other

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Receiver Off-hook Tests (ROH) - one or more phones are off hook on phone line during test.

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Ringer Impedance Tests (RIT)

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AC/DC line voltage

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AC/DC line current

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Line resistance

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Line capacity

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Hook status (on or off)

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Message Waiting Indication (MWI) status (on or off)

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Ring status (on or off)

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Reversal polarity status (on or off)

The FXS line test is currently supported only through CLI.

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To run the FXS line test:

1.

Access the VoIP command set:

# configure voip

2.

Access the FXS interface command set:

(config-voip)# interface fxs-fxo

3.

Type the following command:

(fxs-fxo)# fxs-line-testing < Module/Port > {66|70}

For example, to test FXS port 4 on FXS module1 with coefficient type USA:

(fxs-fxo)# fxs-line-testing 1/4 70