Section 6
♦
Alarm Descriptions
CMN-41 Series Installation and Operation Handbook
97
Copyright © 2009, Harris Corporation
Time Code Alarms Setup Descriptions
The Time Code Alarms Setup menu contents are listed below.
•
LTC Loss of Time Code
: The Loss of Time Code alarm occurs when the
peak-to-peak level of the LTC input signal falls below an adjustable limit for a
period in excess of the duration setting.
•
LTC Time Code Level
: The Time Code Level alarm occurs when the
peak-to-peak level of the LTC input signal falls outside the user defined range
limits for a period in excess of the duration setting.
•
LTC Time Code Framing
: The Time Code Framing alarm occurs when the
alignment of the start of LTC (ANSI/SMPTE 12M-1999) exceeds the range limit
for a period in excess of the duration setting.
•
LTC Time Code Continuity
: The Time Code Continuity alarm occurs when a
break or interruption in the time-code count occurs.
•
LTC/DVITC Compare
: The LTC/DVITC alarm occurs when LTC and DVITC
are compared and differ beyond the threshold (1 to 30 frames) selection for a period
in excess of the duration setting.
•
DVITC Loss of Time Code
: The DVITC Loss of Time Code alarm occurs when
no DVITC Time Code in the video signal is detected for a period in excess of the
duration setting.
•
D-VITC Line
: The D-VITC Line alarm is used to select the line number on which
the D-VITC time code is detected for the “D-VITC Continuity” and “D-VITC
CRC” fields. When time code is not detected on the selected line number, the alarm
activates.
•
D-VITC Continuity
: The D-VITC Continuity alarm occurs when a break or
interruption in the digital vertical interval time code (VITC) frames occur for a
period in excess of the duration setting.
•
D-VITC CRC
: The D-VITC CRC alarm occurs when the cyclic redundancy check
(CRC) within the digital vertical interval time code field does not correlate with the
calculated CRC for a period in excess of the duration setting.
GPI Alarms
The input GPIs have selectable functions. There are selectable functions to allow
external control of the unit or to show an onscreen alarm.
Alarm Log
The Alarm Log selection option enables the Alarm Log display. The Alarm Log
display lists all the alarms, the date, time, time code, duration, and peak value. The
alarm list begins with the most recent alarm and can hold a maximum of 100 alarms.
An Alarm Log display diagram is shown in
Figure 4-34
on page 55 and described in
Table 4-14
. The diagram illustrates the general location for the various alarm fields.
