Datum Systems PSM-500L Bedienungsanleitung PDF herunterladen (Seite 28)

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

Rev. 0.86

A-28

Data Interface Specifications

Data Input

Type: .......................................................... Synchronous, Programmable for RS-449/422,

.......................................................... V.35, V.36, EIA-530, EIA-530A or Synchronous

.......................................................... RS-232 with separate Clock and Data signals.

.......................................................... G.703, Ethernet and others optional via

.......................................................... option interface assembly.

.......................................................... Flexible clock options allow the transmit timing

.......................................................... to be supplied by:

..........................................................a. An internally generated ± 2 ppm reference

.......................................................... clock or external reference, if supplied.

..........................................................b. The demodulator RCV clock as recovered

.......................................................... from the receive carrier.

..........................................................c. A Terminal Timing input as supplied to the

.......................................................... modem TT interface pins.

..........................................................d. A Separate Send Timing input as supplied to

.......................................................... the modem Ext. Timing interface pins.

Termination: ..................................................... Per applicable interface specification.

.......................................................... Termination can be removed in RS-449 mode.

Data Output

Type: .......................................................... Synchronous, Programmable for RS-449/422,

.......................................................... V.35, V.36, EIA-530, EIA-530A or Synchronous

.......................................................... RS-232 with separate Clock and Data signals.

.......................................................... G.703, Ethernet and others optional via an

.......................................................... option interface assembly.

.......................................................... Additional clock options allow the demodulator

.......................................................... RCV clock to be supplied by:

..........................................................a. The actual received bit rate.

..........................................................b. The modulator transmit clock source.

..........................................................c. An internally generated timing clock source.

..........................................................d. A user supplied FIFO output clock source.

.......................................................... Using b, c or d enables the receive FIFO buffer.

Modem Bit Delays

Modulator Transmit Delays

Modulation Processing..................... 1 user rate bits.

Viterbi FEC Encoder:

Rate ½.......................................... 12 channel rate bits.

Rate ¾.......................................... 15 channel rate bits.

Rate 7/8........................................ 17 channel rate bits.

Reed-Solomon Encoder...................(8·k)+10 user/IBS output rate bits

.......................................................... + fixed 500 us delay.

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