Black Box 5000 - Manual (Page 175)

CHAPTER 13: LCD/Keypad
173
+1 dB +
OK LO RO LS RS TM OK LO RO LS RS TM
-4 dBm THROUGH +1 dBm
-15 dBm THROUGH -5 dBm
-25 dBm THROUGH -16 dBm
< -25 dBm
CHANNEL 2 CHANNEL 1
= ON
= OFF
= GREEN LIGHT
LEGEND:
NORMAL = 2 LIGHTS ON. IF CONVERSATION IS GOING ON, THIRD LIGHT IS FLICKERING.
Figure 13.5. Voice/Fax Input Level Display Diagnostic Test.