Videotek TVM9100PKG Installation And Operation Handbook page 217

• 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
CRC ERRORED SECONDS
SAV PLACED INCORRECTLY
LINE LENGTH ERROR
FIELD LENGTH ERROR
RESERVED VALUES USED
IMPROPERLY
ANCILLARY DATA CHECKSUM ERROR
ANCILLARY DATA PARITY ERROR
ANCILLARY DATA PLACEMENT ERROR
ABSENCE OF SERIAL VIDEO INPUT
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.
Alarm Descriptions
Description
The integer number of seconds in which an EDH or
CRC error has existed.
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.
The Line Length Error occurs when there are an
incorrect number of words between EAV and SAV.
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.
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.
The Ancillary Data Checksum Error occurs when the
internal calculated CRC value is different from the
received CRC value.
The Ancillary Data Parity Error occurs when the
internal calculated parity value is different from the
received parity value.
The Ancillary Data Placement Error occurs if an
ancillary header appears outside of blanking.
The Absence of Serial Video Input error occurs when
the signal in the serial video input is lost.
TVM Series Installation and Operation Handbook
Copyright © 2008, Harris Corporation
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