Comtech-ef-data SDM-2020 Bedienungsanleitung PDF herunterladen (Seite 176)

SDM-2020 Satellite Demodulator Revision 4

G.703 Data Interface MN/SDM2020D.IOM

11–10

11.1.5 Receive Doppler/Plesiochronous Buffer Specifications

11.1.5.1 Buffer Size

The operator can set the buffer size, ranging from 2 milliseconds to 32 milliseconds, in

2 millisecond steps. There is also a buffer bypass selection, buffer size of 0 milliseconds.

11.1.5.2 Frame Structures

The unit provides programmable plesiochronous buffer slips.

Frame structures provided according to data rate:

• 1544 kbps - None or G.704

• 2048 kbps - None or G.704

• 6312 kbps - None, G.704, G.743, or G.747

• 8448 kbps - None, G.704, G.742, or G.745

• 32064 kbps - None or G.752

• 34368 kbps - None, G.751, or G.753

• 44736 kbps - None, G.752

• 51840 kbps - None or STS-1

11.1.5.3 Buffer Clock Sources

The unit shall provide for buffer clock source selections.

Source selections:

• Internal

• Transmit terrestrial

• External Reference

• RX satellite

11.1.5.4 Buffer Clock Backup

In the event of failure of the selected buffer clock the unit automatically selects the RX

satellite clock as the backup.

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Comtech-ef-data SDM-2020 Bedienungsanleitung Seite 176