Paradise specifications P300H P300 Series Installation and Operating Handbook

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Rx Warn: No clk ref=<source> , now int'

Rx Warn: Back' alm received at ins' mux

Rx Warn: MF Back' alm Rx'd at ins' mux

Rx Warn: X.50 Back' alm from satellite

Rx Warn: RF sig too low, now <-71dbm>

Rx Warn: RF Sig too high, now <-19dBm>

Rx Warn: Eb/No below user threshold

Description / Cause / Notes

The reference specified for the PLL which generates the Rx output clock (or backup Rx clock) has failed, the modem has switched to using the internal 1PPM reference to keep the clock available. Check the clock <source> specified is present. If a station clock is specified as available the modem will use this as the <source> to generate the backup Rx output clock even if “Station” not specified as the primary source on the Rx Clock Mode screens. Check that the Station clock is still connected as it is a common mistake to change the Rx Clock Mode to something other than “Station”, then disconnect the station clock assuming the modem will not use it, whereas the modem will always use it in preference to the internal 1PPM clock if it is has been told a station clock is available. (Change, Rx, Clock/Buff, Station Clock Input).

This fault will only be displayed if the modem if fitted with an interface which provides four ports for separate input and output of separate Tx/Drop and Rx/Insert PCM bearers. It indicates a Backward Alarm is detected at the Rx bearer Input. This indicates that equipment downstream of 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.

This fault will only be displayed if the modem if fitted with an interface which providesfour ports for separate input and output of separate Tx/Drop and Rx/Insert PCM bearers. It indicates a Multiframe Backward Alarm is detected at the Rx bearer Input, this indicates that equipment downstream of the RECEIVE path has failed to find Multiframe sync and is returning an alarm. The Modem only detects this alarm when the Rx baseband is set to use the Insert mux in a G.732 mode and CAS signalling has been selected. 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.

This indicates the distant end equipment has an X.50 fault and is returning an X.50 backward alarm. See the description for the message “Rx Fault: X.50 de-stuff sync lost” for a further description.

The Receive RF signal level is below the range specified for this equipment. Increase the level to ensure specified performance is met.

The Receive RF signal level is above the range specified for this equipment. Decrease the level to ensure specified performance is met.

The Receive Eb/No (derived from the Carrier to noise ratio) is worse than the user threshold set for a deferred alarm (Change, User-Opt, Thresholds, Eb/No). This may be used as an advance warning of service degradation.

Relays

D

D

D

D

D

D

To Terr

To Sat

Other

P300H P300 Series Installation and Operating Handbook Page 225