Paradise P300 specifications Faw, Fec, Prbs, IBS MF Period

6.10.6 Change, User-Opt, Operation, SATELLITE Menu

Satellite: 1:BER est’ 2:IBS MF period 3:Carrier ID’s 4:Back alm map 5:IF-50/75

Change, User-Opt, Operation, Satellite Menu S

BER ESTIMATE This selects the source for the USER BER estimate displayed on the Receive Status Screens, and compared to both the Deferred USER BER alarm, and BER > 1 x 10-3alarm thresholds. The selection is from:

AUTO The unit selects the most appropriate source. Note that the INTELSAT mandatory method is FAW, although Auto will select more accurate or more quickly updated methods if available. The list of priorities is as follows:

	1.	The PRBS tester (if in the main data channel)
	2.	The Reed-Solomon outer FEC Codec (if active)
	3.	The Turbo, Viterbi or Sequential inner FEC (if active)
	4.	The PRBS tester in ESC or Aux channels (if active)
	5.	The errors counted over one minute on the FAW (if
		framed)
	6.	No estimate of BER
FAW	An estimate based on the count of errors on the Frame
	Alignment Words (FAW) received by the deframer over a 1
	minute sliding window. Only available if operating in a
	framed mode.
FEC	An estimate of the output error rate from the FEC decoder,
	based on the count of errors into the FEC and the FEC code
	rate. Note that if FEC is manually selected, but Reed-
	Solomon is active, the BER estimate will not include the
	significant error improvement of the RS codec.
RS	An estimate of the output error rate of the RS Decoder based on
	the number of uncorrectable words passed by the decoder.
PRBS	The real BER as measured by the PRBS tester, whether it be in
	the ESC or Aux channel, or the main data channel.

Default: AUTO

IBS MF PERIOD	This option is only applicable to Custom, IBS, Minimum overhead modes. In this
	mode the overhead is varied to accommodate any ESC requirements, and if the
	ESC and main data rate are very low the overhead multiframe structure might be
	very long. Whenever the Rx carrier is re-acquired the multiframe alignment also
	has to be re-acquired, and this option allows the maximum multiframe period to
	be specified in order to prevent excessively long multiframe periods affecting
	carrier re-acquisition times. By default it is 2000ms, approximately 4 times the
	normal IBS multiframe time of 512ms at 64kbps. This will only be an issue where
	very low data rates (<16kbps) and low ESC rates are in use, or Minimum
	overhead mode is active with No ESC requirement and the multiframe just
	provides timeslot ID maintenance and backward alarm facilities. Only consider
	adjusting from default if you see long periods where the status displays "TS32
	Multiframe sync lost" or "CAS Multiframe sync lost" after the demod has lost and
	re-acquired the carrier. Default: 2000ms
Carrier ID'S	The earlier versions of the Eutelsat SMS specification defined 3 eight bit identities
	which may be transmitted once per satellite TS32 multiframe to identify the carrier
	and the earth station. These were named Station ID, Carrier ID & Spare ID. More
	recent issues just say "reserved for uses such as.....". This options allows these

P300H P300 Series Modem Installation and Operating Handbook Page 104