Alarm Descriptions
198 TVM Series Installation and Operation Handbook
Copyright © 2008, Harris Corporation
VITS
The VITS alarm occurs when the selected lines become active or inactive as set by the
amplitude threshold for a period in excess of the duration setting. One or more lines
can be monitored, and they do not have to be successive. For example, line 17/E can be
monitored for activity over 50 IRE while line 20/O is monitored for inactivity under 50
IRE. The threshold and duration settings are global.
Captioning
Closed Caption Not Detected – Analog
The Closed Caption Not Detected alarm is activated when the presence of a closed
caption data word on line 21(284) with valid parity bits is not detected in a composite
signal for a period in excess of the duration setting.
Closed Caption Not Updating – Analog
The Closed Caption Not Updating alarm is activated when closed caption carrier is
present and the data word on line 21 is null in a composite signal for a period in excess
of the duration setting.
Teletext Not Detected – Analog
The Teletext Not Detected - Analog alarm occurs when the presence of Teletext is not
detected for a period in excess of the duration setting.
Teletext Not Updating – Analog
The Teletext Not Updating - Analog alarm occurs when Teletext carrier is present and
the data word is the same for a period in excess of the duration setting.
XDS Not Detected – Analog
The XDS Not Detected - Analog alarm occurs when the presence of XDS is not
detected for a period in excess of the duration setting.
XDS Not Updating – Analog
The XDS Not Updating - Analog alarm occurs when XDS is present and the data word
is the same for a period in excess of the duration setting.
Time Code Alarm Descriptions
There are two type of Time Code Alarms: LTC and DVITC Time Code Alarms.
LTC Time Code Alarms
The LTC Time Code Alarms are listed below.
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