Datum Systems PSM-500L Uživatelský manuál stáhnout pdf (Strana 8)

Datum Systems PSM-500, 500H & 500L VSAT/SCPC Modem Specification

Rev. 0.86

A-8

BER vs. Eb/No Performance: .......................... 0.2 dB typical over theoretical.

.......................................................... 0.4 dB maximum. See performance curves below.

Differential Decoding:....................................... Selectable On or Off.

Descrambler:.................................................... IESS 308 or 309, Intelsat and V.35 selectable with

.......................................................... enable @ Front Panel and via serial control port.

.......................................................... IBS, Reed-Solomon and TPC specific modes are

.......................................................... available when these options are enabled/installed.

Receive Data FIFO Buffering...........................4 bits to 524,280 bits, programmable in 1 bit

Plesiochronous or Doppler .......................... increments or in time increments. The buffer is a

Elastic Store................................................. 1048,560 bit (maximum) self centering FIFO. Over

.......................................................... or under-flow result in re-centering. When set to even

.......................................................... multiples of the number of frame bits the re-centering

.......................................................... minimizes frame disruption.

Buffer Output Clock Options ............................a. Receive Clock (disables buffer)

..........................................................b. Modulator Clock

..........................................................c. Internal Clock. Same rate as receive data rate clock

.......................................................... setting, but accurate to 2 PPT at rate 1/2, or 4 PPT,

.......................................................... rate 3/4 or 7/8, relative to either internal or external

.......................................................... reference clock as selected.

..........................................................d. External Clock, input on data interface.

L-Band Internal OCXO Reference Specifications – PSM-500L only

Frequency: .......................................................10 MHz

Stability and Aging: ..........................................±1 x 10

-8

, ±2 x 10

-7

per year

Phase Noise:.................................................... -110 dBc @ 10 Hz

.......................................................... -130 dBc @ 100 Hz

.......................................................... -140 dBc @ 1 kHz

.......................................................... -150 dBc @ 10 kHz

.......................................................... -155 dBc @ 100 kHz

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Datum Systems PSM-500L Uživatelský manuál Strana 8