Polarity Check - Model 4
For Model 4 please use the following procedure to check line polarity.
Connect the BLACK test lead to TIP (positive), and connect the RED test
lead to RING (negative). Switch to “TLK” to access the network. Press the
“Pol” key on the keypad. If the GREEN LED lights up, the line polarity is
correct; if the RED LED lights up, the line polarity is reversed.
Polarity Check - Model 4SP
Model 4SP indicates polarity continuously, without requiring a keypad
action. Otherwise operation is as above.
NOTE: All testsets will operate regardless of line polarity.
Ringer
The Model-4 testsets are equipped with an internal ringer to indicate
incoming ring signals. Connect the testset to a line. The TLK/RING/MON
switch should be in “RING” position in order to receive incoming ring sig-
nals.
Amplified Speaker Operation
Model 4SP is equipped with an amplified speaker circuit to monitor line
activity.
To operate this feature, go “off-hook” (into the “talk” position) and press
the speaker key once.
The speaker key is located in the upper right corner of the keypad and
has a small speaker symbol on it. Press once to provide the first level of
amplification. A second press will provide additional amplification and a
third press will shut off the amplifier feature.
Note 1: Operation of the amplified speaker feature does not require a
battery.
Note 2: The amplified speaker feature does not operate in monitor mode.
5
BELT CLIP
MODULAR
PLUG
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