UNITY 4600 USER’S MANUAL
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On the Home screen, the (right-pointing arrow) field will quickly flash (a half-second ON
and a half-second OFF) to signal the user that the right arrow button is active for user con-
trol. Pressing either the left or right arrow buttons will cause the U4600 to display the other
top-level screens in succession. If there are current alarm and warning indications, the text
"See Alarms" or "See Warnings" will appear before the arrow and pressing the right arrow
will display the applicable alarm or warning message(s).
Interpreting Front Panel LEDsTable 3.2: Front-Panel LED Indicator Descriptions provides the meaning of the color and
state of each LED in Figure 3.5 below.
Figure 3.5: LED Indicators.
Table 3.2: Front-Panel LED Indicator DescriptionsIndicator Label Color and State *Meaning
CARRIER GREEN constant Unit has demod and FEC lock on the RF carrier
Off Unit does not have demod and FEC lock on the RF carrier
TRANSPORT GREEN constant Unit recognizes a valid transport stream
Off Unit does not recognize a valid transport stream
COMPEL GREEN constant COMPEL control stream received within last two minutes
(including keep-alives) while locked continuously on the current
transport stream for >2 minutes
GREEN flash Unit has had a verified transport stream for >2 minutes and
COMPEL is required but no valid COMPEL
GREEN flutter COMPEL has been addressed to unit within last 5 seconds
(excluding keep-alives)
Off Otherwise. Note that this LED must be OFF when there is no valid Transport
stream OR COMPEL
SERVICES GREEN constant Unit is processing services for delivery
Off Unit is not processing services
WARNING YELLOW constant One or more warning indications exist, usually the failure of a non-
essential item, or to warn of an impending failure of an essential
item
Off No warning conditions