Videotek TVM9100PKG Installation And Operation Handbook page 225

Alarm Descriptions
PID Error
A Packet Identifier (PID) error occurs when a data stream for each PID is not identified
for a period in excess of the range setting. The error might occur where transport
streams are multiplexed, or demultiplexed and remultiplexed.
nd
ETR 290 2 Priority
nd
The ETR 290 2 Priority menu contains the Transport Error, CRC Error, PCR Error,
PCR Accuracy Error, PTS Error, and CAT Error alarm settings.
Transport Error
The Transport Error alarm activates when erroneous transport stream packets are
counted.
CRC Error
The Cyclic Redundancy Check (CRC) checks for the Program Access Table (PAT),
Conditional Access Table (CAT), Program Map Table (PMT), Service Description
Table (SDT), Network Information Table (NIT), Bouquet Association Table (BAT),
Time Offset Table (TOT), Event Information Table (EIT), System Time Table (STT),
Master Guide Table (MGT), Virtual Channel Table (VCT), Region Rating Table
(RRT), and the Extended Text Table (ETT). A CRC Error alarm indicates if the content
of any selected table is corrupted.
PCR Error
A Program Clock Reference (PCR) is used to re-generate the local 27 MHz system
clock. If the PCR does not have sufficient regularity, the clock can jitter or drift and the
receiver/decoder can become unlocked. When irregularities occur outside the PCR
Error ranges, the PCR Error alarm activates. In Digital Video Broadcasting (DVB), a
repetition period of not more than 40 ms is recommended.
PCR Accuracy
A PCR Accuracy Error occurs when the synthesized clock falls outside the set range. A
PCR accuracy of ± 500 ns is intended to be sufficient for the color subcarrier to be
synthesized from the system clock.
PTS Error
Presentation time stamps (PTS) determine the time when a picture is shown on the
screen. A PTS Error occurs when PTS is not detected in a signal. The PTS should
occur at least every 700 ms. The PTS are only accessible if the transport stream is not
scrambled.
CAT Error
The Condition Access Table (CAT) is the pointer to find the Entitlement Management
Message (EMM) associated with the CA system(s) that it uses. If the CAT is not
TVM Series Installation and Operation Handbook 201
Copyright © 2008, Harris Corporation