Alarm Descriptions
TVM Series Installation and Operation Handbook 193
Copyright © 2008, Harris Corporation
• ANC DATA PLACEMENT ERROR (anc placement)
• ABSENCE OF SERIAL VIDEO INPUT (no video)
Press the ENT button to reset the CRC elapsed time to zero and clear the EDH errors.
Table 5-2. CRC Alarm Error Types
Error Type Description
CRC ERRORED SECONDS The integer number of seconds in which an EDH or
CRC error has existed.
SAV PLACED INCORRECTLY SAV is relative to EAV. The number of words is a
constant for any given video format between EAV and
SAV. EAV is detected and used as the reference. The
correct number of words is counted, and then SAV is
detected. The SAV Placed Incorrectly alarm occurs
when a proper SAV sequence is not detected or if SAV
is detected before the correct number of words
between EAV and SAV.
LINE LENGTH ERROR The Line Length Error occurs when there are an
incorrect number of words between EAV and SAV.
FIELD LENGTH ERROR The number of lines is constant between the B bit
going high and the start of vertical blanking. The Field
Length Error occurs when there is deviation in the line
number count.
RESERVED VALUES USED
IMPROPERLY
The Reserved Values Used Improperly alarm occurs
when the eight most significant bits (SD) or all ten bits
(HD) are all “1” or “0” in any place other than an EAV,
SAV, or ancillary header.
ANCILLARY DATA CHECKSUM ERROR The Ancillary Data Checksum Error occurs when the
internal calculated CRC value is different from the
received CRC value.
ANCILLARY DATA PARITY ERROR The Ancillary Data Parity Error occurs when the
internal calculated parity value is different from the
received parity value.
ANCILLARY DATA PLACEMENT ERROR The Ancillary Data Placement Error occurs if an
ancillary header appears outside of blanking.
ABSENCE OF SERIAL VIDEO INPUT The Absence of Serial Video Input error occurs when
the signal in the serial video input is lost.
Loss of Carrier
The Loss of Carrier alarm occurs when there is no TRS (Timing Reference Signal)
detected.
Loss of Active Video
The Loss of Active Video occurs when active video falls below the adjustable
threshold for a period in excess of the duration setting.
Loss of Reference
The Loss of Reference alarm occurs when no sync signal is detected in the external
reference for a period in excess of the duration setting. To select the appropriate
external reference see Reference Selection on page 85.
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