Datum Systems PSM-500L Manual do Utilizador descarregar pdf (Página 6)

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

Rev. 0.86

A-6

Frequency Stability: Standard & Hybrid........ ± 2.0 ppm. (176 Hz max) internal reference

L-Band ..........................± 0.01 ppm (1 E-8). (17.5 Hz max) internal

reference

.......................................................... OR locked to external reference’s stability.

L-Band Note: ................................... The internal 10 MHz OCXO reference can be

.......................................................... used to phase lock an external BUC.

Aging: Standard & Hybrid......... ±1 ppm per year using internal reference.

L-Band ..........................± 0.2 ppm per year using internal reference

Phase Noise: Standard & Hybrid......... <-87dBc @1kHz.

.......................................................... <-93dBc @10kHz.

.......................................................... <-108dBc @100kHz.

L-Band ..........................

Better than IESS-308/309 by 4 dB min, 6 dB typical

Synthesizer Control:.........................................Via Front Panel and serial control port.

Transition Time: ............................................... < 100 msec. to any frequency including

.......................................................... command latency.

Transmit Baseband Processing

Data Rate:........................................................ Variable under program control and dependent on

.......................................................... Feature Set, FEC selected and interface type.

.......................................................... See Tables 2 to 5 above.

Note: Maximum rates are limited using Reed-Solomon and IBS Multiplexer Options.

Settability ........................................................ Any rate settable to 1 bps increments. Accurate

.......................................................... to 2 PPT at rate 1/2, or 4 PPT, rate 3/4 or 7/8,

.......................................................... relative to either internal (nominally 2.0 ppm) or

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

Data Clock Tracking Range ............................External or Terminal Timing = +/-400 ppm.

.......................................................... Reverts to internal clock outside this range.

Data Rate Clock Sources ................................ a. Internal.

..........................................................b. Terminal Timing input on data connector

..........................................................c. External input on data connector.

..........................................................d. Receive Clock recovered from demodulator.

Forward Error Correction: ............................ See Table 6 above for current modes and rates.

Viterbi ............................................... Convolutional encoder, k= 7.

.......................................................... Rate 1/2. G0 code = 171 octal,

.......................................................... ............ G1 code = 133 octal.

.......................................................... Rate 3/4, 5/6 or 7/8 using punctured code

Trellis Code Modulation (TCM): ....... Rate 2/3 in 8PSK only, may use R-S.

Standard Reed-Solomon Concatenated Codec: Available in Viterbi or TCM.

R-S Rates ..................... Disabled, IESS-308, IESS-309, IESS-310,

CT220-200 and custom.

Optional Turbo Product Codes and S-Tec Codecs Available.

Differential Encoding:....................................... Selectable On or Off @ Front Panel and

.......................................................... via serial control port.

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

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

.......................................................... IBS and Reed-Solomon specific modes are available

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

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