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9100-2930-02 01/31/00

5-28

Section V Option Menu Numbers

Option Menu #:

5-7 OPTION MENU #:7 SUPERVISION THRESHOLDS

OPTION MENU #:7, SUPERVISION THRESHOLDS is a standard feature that allows you to set the line
signalling thresholds for the off-hook/on-hook LEDs. If expected voltages are not present and the line
signalling LEDs flicker or do not light, the threshold needs to be changed.

You cannot change the level of the line signalling voltage, which the 930i supplies as an output. This
is fixed at 48 V and ground. Voltage levels are printed as absolute values: < 45 V does not mean “more
negative” than -45 V. It means less than 45 V of potential. Values can be set to the nearest volt with an
accuracy of

0.5 V. Use OPTION MENU #:6, DC VOLT/AMP METER, to examine the current and

voltage levels.

Supervision Threshold Ranges for 48 V DC

Normal Loop Start Supervision

Voltages above 39 V will cause an On Hook indication from the line signalling lamps. Voltages

above 3 V and below 39 V will cause an Off Hook indication. A reversal of -48 V and ground indicates
the battery side Off Hook. (Refer to

Section 5-7.2

for detailed setup information.)

Ground Start Supervision

Voltages on Ring above 33 V indicate On Hook at the contact side. Voltages on Tip in excess of

33 V indicate On Hook on the battery side.

E&M Supervision

Originating End (SEND-M) Indications

The ORIG LED shows the status of the 'M' lead. An Off Hook indication is provided if the voltage

is above 39 volts. The LEDs will not be lit for voltages above 11 V but below 39 V. The LEDs indicate
On Hook if the voltage is less than 11 V. (Refer to

Section 5-7.3

for detailed setup information.)

The TERM LEDs show the status of the 'E' lead. An Off Hook indication is provided if the voltage

is below 11 V. The LEDs will not be lit for voltages above 11 V but below 39 V. The LEDs show an On
Hook if the voltage is above 39 V. (Refer to

Section 5-7.3

for detailed setup information.)

Terminating End (SEND-E) Indications

In this case, the ORIG LED shows the status of the 'E' lead. The LEDs will indicate an Off Hook

status if the voltage is below 11 V and On Hook if the voltage is above 39 V. The LEDs will not be lit
for voltages above 11 V but below 39 V. (Refer to

Section 5-7.3

for detailed setup information.)

The TERM LEDs show the status of the 'M' lead. The LEDs will indicate an Off Hook status if the

voltage is above 39 V and On Hook if the voltage is less than 11 V. The LEDs will not be lit for voltages
above 11 V but below 39 V. (Refer to

Section 5-7.3

for detailed setup information.)

The following sections provide examples for setting Loop Start and E&M trunk line signalling

thresholds to accommodate 24 V line signalling instead of the normal 48 V.

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