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Text on Display Description / Cause / Notes
Relays To Terr To Sat Other
P300H P300 Series Installation and Operating Handbook Page 218
Tx Fault: CRC sync lost on Tx input The modem only seeks Cyclic Redundancy Code (CRC) sync when the Tx baseband is set to use T
the Drop mux in G.732 mode (or 2048k IBS G.732 0% overhead mode) and when set by the user to
process CRC’s (Change, User-Opt, Operation, Terrestrial, PCM Bearer CRC, Process). If CRC
sync is permanently lost, check if a CRC is present on the PCM signal.
Tx Fault: Dropped data is all ones (AIS) The specific timeslots dropped by the Drop Mux contain all ones (AIS). This is different to the “Tx T TB SA
Fault: Data input is all ones (AIS)” message described earlier which refers to the whole PCM bearer
being AIS. In the case it is only the specific timeslots which contain AIS. This is normally used to
indicate an upstream equipment fault, it is not a modem fault. See note 4
Opt Opt Opt
Tx Fault: Input BER > 1E-3, [AIS forced] The Bit Error Rate at the Tx input (measured on the PCM Frame Alignment Words) is worse than T TB SA
1x10 . This can only be due to a very poor error rate on the PCM input signal. “[AIS Forced]” is only
-3
shown if the user option of what action to take when the BER is bad is not set to Ignore (Change,
User-Opt, Operation, Actions, BER Action). The fault is always displayed, although the actions can
be cancelled by selecting Ignore. Check the line code setting (AMI/B8ZS/HDB3) matches the input
signal on any G.703 cards in use (see note 3).
Opt Opt
Tx Fault: Clock loop fail, Tx muted The Tx clock generation loop, which generates the timing over the satellite link has failed and the Tx T CM ! CM, TF
carrier is muted as a result. If the Tx Clocking (Change, Tx, Clocking) is set to “Tx Clock In”, then
check the Tx Clock frequency matches the data rate (Change, Tx, Baseband, Continuous).
Tx Fault: BUC DC current outside limits The Modem is configured to operate with a BUC and the operator has activated the BUC current T
monitor, but the current drawn by the BUC is outside the low/high window set. View the current
drawn and alarm settings with Monitor, BUC, change with Change, BUC/LNB, Tx/BUC, Current
Monitor
Tx Fault: BUC current/connection fault The Modem is configured to operate with a BUC and the modems DC supply to the BUC has beenT
activated, but the DC switch indicates either an open or short circuit.