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Relays To Terr To Sat Other
P300H P300 Series Installation and Operating Handbook Page 219
TX WARNINGS (Top line of display)
Tx Traffic warnings: Deferred alarm relay only
Tx Warn: Reconfiguring Tx path The modem is reconfiguring the Tx path (after a user parameter change).
Tx Warn: Data marginal, clock inv ? The phase of the input Clock and Data is checked to ensure the data is stable when it is actually D
latched into the modem. This message means that the data is changing at this critical time, and it
WILL CAUSE DATA ERRORS. Check the A & B clock lines are not reversed. (Data A & B should
be stable on the rising edge of Clock B, the falling edge of Clock A)
Tx Warn: Line code violations det’ G.703 interfaces have several different line codes. For 1544kbps they are typically AMI and B8ZS, D
and for 2048kbps they are AMI and HDB3. Normally the LATTER is the one which is used. The
interface must be configured to match the line code of the other equipment, otherwise line code
violations (ie terrestrial data errors) will occur. See Note 3
Tx Warn: Transmit FIFO slip The FIFO which interfaces the Drop Mux to the Framer has slipped (full or empty). This should never
occur in operation (contact factory).
Tx Warn: Backward alarm at Tx input A Frame Backward Alarm is detected at the Tx Input. This indicates that equipment downstream of D SB
the RECEIVE path has failed and is returning an alarm. This may be due to any receive downstream
equipment, but could be due to the modem Rx output failing. Check the modem Rx path indicates
OK, Check the Rx data output from the modem is connected to the downstream equipment.
Tx Warn: TS16 MF Back' alarm at Tx input A Multiframe Backward Alarm is detected at the Tx Input, this indicates that equipment downstream D SB/SD
of the RECEIVE path has failed to find multiframe sync and is returning an alarm. The Modem only (Note 2)
detects this alarm when the Tx baseband is set to use the Drop mux in a G.732 mode and CAS
signalling has been selected (or 2048k IBS G.732 0% overhead mode with CAS is enabled). On the
Rx path, if the Insert Mux bearer is set to Generate, then check the Rx path is also utilising CAS,
otherwise it will generate a bearer without a TS16 Multiframe.
Tx Warn: Tx input BER > User threshold The Bit Error Rate at the Tx input (measured on the PCM Frame Alignment Words) is worse than D
the user set threshold for a deferred alarm (Change, User-Opt, Thresholds, User BER). This
warning will be replaced with a Fault message at 1x10 . Check the line code setting
-3
(AMI/B8ZS/HDB3) matches the input signal on any G.703 cards in use. See note 3
Tx Warn: Framer slipping data to sync After a break in the Tx input data, the framer is `bit slipping` data in the Transmit FIFO to bring the
data taken out of the FIFO by the framer into step with the satellite frame timing. It bit slips (rather
than force the frame timing into step with the data) to prevent causing a frame sync loss in the
distant end equipment.
Tx Warn: Framer slipping sig' to sync See above text, but this time with regard to CAS signalling data not the main data path.
Tx Warn: Framer Sig' FIFO slip The FIFO which carries the CAS signalling from the Drop Mux to the Framer has slipped (full or
empty). This should never occur in operation (contact factory).