Paradise P300 specifications Rx Traffic Faults Rx OK LED Off and Rx Traffic prompt relay

Text on Display

Description / Cause / Notes Relays To Terr To Sat Other

RX TRAFFIC FAULTS (Bottom line of disp’l

Rx Fault: Demod unlocked at <nn.nnnn>MHz

Rx Fault: FEC sync lost (demod locked)

Rx Fault: De-interleaver sync lost

Rx Fault: Frame sync lost

Rx Fault: TS32 Multiframe sync lost

Rx Traffic Faults: Rx OK LED Off and Rx Traffic (prompt) relay.

The Demod cannot find a carrier to lock to at the specified frequency. Check the frequency, check the Data rate and FEC settings (use Info, View Config, Rx). Perhaps check the demod itself by enabling a IF Loopback (Test, Loopback, IF).

The Demod can lock to the carrier, but the inner FEC decoder (Turbo, Vit or Seq) cannot lock to the demodulated data. Check you have the correct FEC settings (ie Turbo, Vit or Seq as appropriate, use Info, View Config, Rx). The most common other cause is Spectrum Inversion, you can check this by temporarily turning on the Rx Spectrum Inversion (Change, Rx, Demod Spect Inv).

The Demod can lock to the carrier, and the inner FEC decoder to the demodulated data. However the Reed-Solomon De-interleaver cannot find sync with the decoded data. Check the RS de-interleaving depth, then the values of `n` and `k`(use Info, View Config, Rx). On Non-Paradise Tx modems, check the V.35 scrambler is not enabled in addition to the Reed-Solomon scrambler.

The modem cannot find the IBS or IDR frame sync on the receive data. Check the Rx Service settings (Change, Rx, Service), although as the service type affects the composite data rate over satellite, it is more likely the demod will fail to lock rather than this message appear if the wrong service type is selected. On Non-Paradise Tx modems, for IBS, check the V.35 scrambler is not enabled in addition to the IBS/SMS scrambler.

The modem cannot find the IBS TS32 Multiframe sync on the receive data although it has found Frame sync (otherwise the message above would display). This is only likely in Custom IBS modes where the operator has the option of sending a TS32 Multiframe or not. Note that for low data rates the standard IBS/SMS multiframe period can be long (1 sec at 32kbps) and it may be best to use Custom IBS without a TS32 MF for rates of below 32kbps to improve the acquisition time if the carrier is momentarily lost.

T

T

T

T

T

TA,TC

TA,TC

TA,TC

TA,TC

TA,TC

SB

SB

SB

SB

SB

RF

RF

RF

RF

RF

P300H P300 Series Installation and Operating Handbook Page 221