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This screen displays statistical information about the three RF channels.

    Current FDC - Current Forward Data Channel information:
      Freq is the frequency to which the QPSK receiver is tuned.DAVIC is current DAVIC connection status. Generally, under normal operation, the status should be "Connected" in a two-way environment or "Ready - B'cast Only" in a one-way environment. Most of the other states are so short that they are not visible in the diagnostic screens with production ROMs. Possible values are:
        "Searching Chnls"indicates that the set-top is searching for a QPSK frequency containing valid DAVIC data."Booting"indicates that the set-top is attempting to initiate a DAVIC connection."Provisioning"indicates that the set-top is waiting for a DAVIC provision message."Dflt Cfg"indicates that the set-top is waiting for a DAVIC default configuration message."Slow-Boot Wait"indicates that the set-top is waiting for the slow-boot timeout period. (This used to be "Boot Timeout" prior ResApp release A22.)"Sign-On"indicates that the set-top is waiting for a DAVIC sign-on message from the DNCS."Resp"indicates that the set-top is received a sign-on request and is waiting for a randomized timeout before sending the DAVIC sign-on response to the DNCS."Completion"indicates that the set-top has sent the sign-on response and is waiting for a DAVIC initialization complete or DAVIC ranging and power-calibration message."Calib Power"indicates that the set-top is calibrating its QPSK transmitter's power level for optimal performance."DNCS Conn"indicates that that the set-top has adjusted its power, received the initialization completion message and is now is waiting for the DNCS to send a DAVIC connect message to establish the default DNCS connection."DNCS Conf"indicates that the set-top received the DAVIC connect message from the DNCS, responded with a DAVIC connect response message and is waiting for the DNCS to send a connect confirm message."Conn Confirm"indicates that the set-top received a DAVIC connect message for a connextion established by an active session, has sent a DAVIC connect response message and is waiting for a DAVIC connect confirm message to acknowledge that the session's connection is ready to use."Connected"indicates that a connection exists (the usual state in a two-way environment)"Data Lock Lost"indicates that the set-top has stopped receiving valid data and will need to re-establish a DAVIC connection when it finds valid data again."Ready - B'cast Only"indicates that the set-top failed to sign-on and is operating in one-way mode. A background timer will continue to try to sign-on periodically."Unauthorized"indicates that the set-top is not authorized to sign-on with the DNCS."Unknown"indicates an unknown state (this should never be seen).
      Status is "Locked" if the receiver is locked onto a frequency with valid QPSK data, or "Unlocked" if not.Level is the approximate received signal level. If the value displayed is in yellow, the level is marginally too high or too low. If the value displayed is in red, the level is unacceptably too high or too low.Seconds is the number of seconds that the frequency has been locked.Corr Bytes is the number of bytes received in error that have been successfully corrected by the forward error correction (FEC) code.Uncor Blks is the number of data blocks received in error that were unable to be corrected by the forward error correction (FEC) code.Errs Avg/Inst is two numbers. The first number indicates the total number of data errors encountered averaged over the time the frequency has been locked (Seconds, above). The second number indicates the number of errors that have been encountered since the las time the screen was refreshed (every 3 seconds).Total Bytes is total number of data bytes successfully read since the frequency was locked.S/N is the signal to noise ratio. Note that this is not applicable (n/a) on an Explorer 2000.
    Current RDC - Reverse Data Channel information:
      Freq is frequency to which the QPSK transmitter is tuned.Power is the output level of the QPSK transmitter (automatically adjusted through negotiation with the QPSK modem at the headend or hub).Delay is the round-trip delay between the set-top and the modem at the headend or hub. This is used to determine when to transmit the slotted-aloha packets.Retrans is the number of retransmissions of the same data (presumably due to noise or collisions) that have been required since the set-top was last booted.
    Current QAM -
      Freq is the frequency to which the in-band tuner is tuned.Tuning Mode is either "Analog", "QAM-64", "QAM-128", or "QAM-256".Status is "Locked" if the tuner is locked onto a valid analog channel or a a frequency with valid QAM, otherwise is "Unlocked".Level is the approximate received signal level. If the value displayed is in yellow, the level is marginally too high or too low. If the value displayed is in red, the level is unacceptably too high or too low.S/N is the approximate signal to noise ratio (only applicable on QAM data channels)Seconds is the number of seconds that the tuner has been locked on the frequency.Corr Bytes is the number of bytes received in error that have been successfully corrected by the forward error correction (FEC) code.Uncor Blks is the number of data blocks received in error that were unable to be corrected by the forwared error correction (FEC) code.Errs Avg/Inst is two numbers. The first number indicates the total number of data errors encountered averaged over the time the frequency has been locked (Seconds, above). The second number indicates the number of errors that have been encountered since the las time the screen was refreshed (every 3 seconds).EQ Gain is the QAM equalizer gain. This is only applicable on QAM data channels. If the value is in yellow, there is a marginal signal problem that should be corrected. If the value is in red, there is a serious signal problem that needs immediate attention.


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by Corvus See Profile
last modified: 2005-02-15 20:53:05