User manual

MRD 3187B User Manual
Page 15
panel, then use the “Error List” under the button to pinpoint the error. Remotely, the unit’s
status can be checked by using the web client and looking at the status icons on the top of the
main window. To see a detailed list of errors, click on the tab from the web client.
The INPUT LED indicates the presence of a stream at the user-selected
input. “Stream present” is represented by a green INPUT LED while
“stream NOT present” is represented by a dark INPUT LED.
The ERROR LED represents the combined status of the unit’s error
indicators. If INPUT, DECODER, TEMP, or FAN status is in the error
state, the LED will be red. If all error indicators are good, the LED will be
dark.
2.5 Input Error Logic
The input status is based on the selected input card’s status and the transport error indicator bit
in the transport stream being decoded. For example if the current input is VSB, the input status
is based on: VSB receiver lock, RF channel level, and the MER level. The RF channel and
MER thresholds can be set by the user. If the unit detects the presence of the transport error bit
in a transport packet header, the input status will be an error for 0.5 seconds each time the TS
error bit is set. The system must detect a constant cadence of sync bytes (0x47h) every 188
bytes and detect a valid PAT at least every 500 ms in order for the INPUT LED to illuminate.
2.6 Decoder Error Logic
The decoder error indicator is based on the decoder’s ability to decode what the user has
requested. The input status will be alarmed differently depending on the current decoding mode:
In “Auto Mode,” the decoder status will be good unless the Video or Audio decoders cannot
decode a stream. For example: a stream defines program 4 to have video on PID 52. If PID
52 is not actually present in the stream, or is un-decodable, the decoder status will be in the
error state. This is true for all modes.
In “PID Lock Mode,” the decoder status will be good if all of the PIDs entered by the user,
for video and audio, are being decoded by the unit. If the user wants nothing to be decoded,
they can set a PID to 0. If the user enters a PID which is not present or cannot be decoded
the decoder status will be in the error state.
In “Program Priority Mode,” the decoder status will be good if any priority is currently active
and the Audio and Video represented by that priority are being decoded. If the PMT for a
selected program lists a video or audio PID, but the decoder cannot decode that PID, the
indicator will be in the error state. If the user enters an index for a priority that does not exist
in the PMT, the indicator will still be good because the decoder will be set to decode nothing
on that audio output.2.7 Temperature Error Logic
The temperature error indicator is based on the correct operation of the unit. If the unit’s
temperature exceeds 70 degrees C, the temperature status will be in the error state.