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 results of the test are sent to syslog and includes various line statuses and electrical line measurements, for example:

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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)

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FXS line testing is supported only by the FXS module type that supports outdoor FXS cabling.

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You can only test one FXS port at a time.

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Don’t start a new test if one is still running.

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Each new test overwrites the previous test results.

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The FXS port interface is out of service (OOS) during the test.

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Make sure that a telephone is connected to the FXS port that you want to test and that the telephone is in on-hook state and not servicing any calls.

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To run the FXS line test:

Access the VoIP command set:

# configure voip

Access the FXS interface command set:

(config-voip)# interface fxs-fxo

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

Line Testing on FXS Port 4 in Module 1 is Executing... Please wait a few seconds.