Paradise P300 specifications Clocking and Buffering

BER performance with
concatenated RS	BER improvement depends on n and k values chosen, but a typical
	increase in coding gain of 3dB is possible over basic Viterbi mode.
Monitor Functions	Measured FEC input BER (raw channel, not TCM)
	Estimated FEC output BER (not TCM)
	Measured Reed-Solomon input BER
	Estimated Reed-Solomon output BER
	Measured deframer FAW BER
	Measured Eb/No (not based on channel BER, range: 3.0-15.0dB,
	accuracy ±0.2dB).
	Measured frequency offset (± 100 Hz resolution)

Clocking and Buffering

Clock Loops		Frequency locked loops give phase hit immune operation even with poor
			clock sources such as routers etc.
Tx Clocking		Internal Reference (see Internal Reference below for stability)
		External - tracking range ±100 ppm / min.
		Rx Timing - slaves Tx internally generated timing from Rx clocking
			whatever Rx clocking mode is selected eg with Rx=Satellite for loop
			timing (with full asymmetric rate capability), or with Rx=Station for
			both Tx & Rx clocking slaved to Station Clock (again with full
			asymmetric rate capability).
Rx Clocking		Clock from satellite (Buffer disable)
		Transmit input clock - (plesiochronous, includes full asymmetric rate
			operation)
		Internal Reference (see Internal Reference below for stability)
		DCE External timing clock (DTE interface only).
		Station reference (see below)
Internal Reference		P300: +/-1PPM
		P310: Default as per P300. Options: 7x10-7 per year (P313B), 1x10-7
			per year (P313C), 7.5x10-8 per year (P313D).
Station References inputs		75	BNC female, transformer isolated 1MHz to 10MHz in 1kHz steps
			SS
			(accepts sinusoid >0dBm or squarewave eg G.703 para 10)
		120 RS422 compatible input, 1kHz to 10MHz in 1kHz steps
		When set to 10MHz, the station reference may replace internal reference
		to all internal circuitry (eg IF synths). The unit automatically switches back
		to the internal reference if the station reference fails.
Buffer Size		Selectable in 1 ms increments from 0 to 99 ms. Automatically adjusted
		to slip an integer multiple of terrestrial multiframe length for framed rates
		(T1/E1).
		Buffer storage is 32kBytes, so above 2.6 Mbps max buffer size reduces
		linearly from 99 ms to 52ms at 5.0Mbps
P300H	P300 Series Modem Installation and Operating Handbook			Page 26