Data Interfaces
SDM-2020 Satellite Demodulator
A–50
Rev.3
A.6.5
Receive Doppler/Plesiochronous Buffer Specifications
A.6.5.1 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.
A.6.5.2 Frame
Structures
The unit provides programmable plesiochronous buffer slips.
Frame structures provided according to data rate:
•
1544 kbit/s - None or G.704
•
2048 kbit/s - None or G.704
•
6312 kbit/s - None, G.704, G.743, or G.747
•
8448 kbit/s - None, G.704, G.742, or G.745
•
32064 kbit/s - None or G.752
•
34368 kbit/s - None, G.751, or G.753
•
44736 kbit/s - None, G.752
•
51840 kbit/s - None or STS-1
A.6.5.3
Buffer Clock Sources
The unit shall provide for buffer clock source selections.
Source selections:
•
Internal
•
Transmit terrestrial
•
External Reference
•
RX satellite
A.6.5.4
Buffer Clock Backup
In the event of failure of the selected buffer clock the unit automatically selects the RX
satellite clock as the backup.
Содержание SDM-2020
Страница 20: ...SDM 2020 Satellite Demodulator Introduction Rev 3 1 5 2 Data and symbol rates become effective January 1999...
Страница 30: ...SDM 2020 Satellite Demodulator Introduction Rev 3 1 15 Figure 1 7 16QAM 3 4 7 8 Reed Solomon Decoder...
Страница 32: ...SDM 2020 Satellite Demodulator Introduction Rev 3 1 17 This page is intentionally left blank...
Страница 35: ...SDM 2020 Satellite Demodulator Installation Rev 3 2 3 Figure 2 1 Typical Rack Installation...
Страница 57: ...SDM 2020 Satellite Demodulator Operation Rev 3 3 13 This page is intentionally left blank...
Страница 65: ...SDM 2020 Satellite Demodulator Operation Rev 3 3 21 This page is intentionally left blank...
Страница 72: ...Operation SDM 2020 Satellite Demodulator 3 28 Rev 3 This page is intentionally left blank...
Страница 75: ...SDM 2020 Satellite Demodulator Operation Rev 3 3 31 This page is intentionally left blank...
Страница 92: ...Operation SDM 2020 Satellite Demodulator 3 48 Rev 3 This page is intentionally left blank...
Страница 121: ...Data Interfaces SDM 2020 Satellite Demodulator A 20 Rev 3 This page is intentionally left blank...
Страница 141: ...Data Interfaces SDM 2020 Satellite Demodulator A 40 Rev 3 This page is intentionally left blank...
Страница 157: ...Data Interfaces SDM 2020 Satellite Demodulator A 56 Rev 3 This page is intentionally left blank...
Страница 165: ...Data Interfaces SDM 2020 Satellite Demodulator A 64 Rev 3 This page is intentionally left blank...
Страница 203: ...Remote Control Operation SDM 2020 Satellite Demodulator B 28 Rev 3 This page is intentionally left blank...
Страница 209: ...Fast Option SDM 2020 Satellite Demodulator C 6 Rev 3 This page is intentionally left blank...
Страница 212: ...SDM 2020 Satellite Demodulator Glossary Rev 2 g 3 W Watt...
Страница 213: ...Glossary SDM 2020 Satellite Demodulator g 4 Rev 3 This page is intentionally left blank...