7
Physical Characteristics
STORE/PROG
The STORE/PROG key is used for storing speed dialing numbers and for programming special test
set functions.
TONE/PULSE
key
The TONE/PULSE key switches the test set between tone and pulse dialing. The TONE/PULSE key is
active only when the test set is off-hook. Any time the test set goes off-hook, it is automatically set
to tone dialing. Once off-hook, pressing the TONE/PULSE key changes the dialing mode to pulse
dialing. Pressing the key again will switch back to tone dialing.
TEST key
The TEST key performs three different tests. Two of the tests are performed when the test set is
on-hook and one of the tests is performed when the test set is off-hook. The test results are
meaningful only if the unit’s test leads are connected to tip and ring of a subscriber line.
When the test set is on-hook, pressing the TEST key causes two tests to be executed. Both tests are
performed simultaneously. When the TEST key is pressed, the test set searches for data on the
telephone line. If the test set detects data, the data-detect alarm sounds for about 5 seconds
letting you know there is data on the line. If there is no data, the test set sounds a brief
confirmation tone indicating the test was run and no data was detected. Simultaneously, the test
set measures the dc voltage across Tip and Ring and displays, by LED, whether the voltage is high,
low or normal. The indications provided by this test are described under “HI/LO Voltage LEDs”.
The purpose of the test is to indicate the approximate dc voltage on the line. For example, the
user runs the test, expecting a normal battery feed of -48 Vdc on a line; instead, the amber LED
flashes indicating the dc voltage is lower than a normal CO battery. This indicates the test set may
be connected to the wrong pair, or there may be a problem with the line.
The POL LEDs double as low loop current indicators. When off-hook and the TEST key is pressed, if
the current reading is below 23 mA, the LED corresponding to the line polarity will flash for 5
seconds. If the loop current is normal, the LED will light solid. Low loop current may indicate a
problem on the line.
Light
Emitting
Diodes
(LEDs)
All LED indicators are located on the keypad inside the recessed area.
MUTE LED
The MUTE LED flashes when the mute function is activated.
LO BATT
(low battery)
LED
The LO BATT LED flashes when the 9 V battery is nearly discharged. The LED is active only in
operating modes that use the battery.
-continued-
Table 2. Test Set Keypad Control and Indicators (continued)
Key or
Indicator
Description (refer to Figure 3)
