B
Appendix A • Specifications
APEX1000 All-Purpose Edge QAM Software Version 2.4.x • Installation and Operation Manual
284
573408-001-a
Parameter
Specification
Annex B DC II 256 QAM
5.360537 Msym/sec
Annex A DVB
0.8 to 6.98 Msym/sec
Annex C
0.8 to 5.31 Msym/sec
QAM carriers per output
Six outputs, each RF output contains up to eight adjacent QAM
channels.
Channels
RF Level Range [nominal]
(dBmV/Channel)
1
52 – 63 [60]
2
48 – 59 [56]
4
44 – 55 [52]
6
42 – 53 [50]
Output level adjustment range
8
41 – 52 [49]
Output level step size
0.5 dB
Output impedance
75 Ohms
Output return loss
•
>14 dB within an active output channel block anywhere within
57 MHz to 750 MHz
•
>13 dB within an active output channel block anywhere within
750 MHz to 870 MHz
•
>12 dB within an active output channel, from 870 MHz to 1002
MHz
•
>12 dB in every inactive channel from 54 MHz to 870 MHz
•
>10 dB in every inactive channel from 870 MHz to 1002 MHz
QAM constellations
64 QAM or 256 QAM
QAM FEC encoding modes
ITU T J.83 Annex A, B
Both Annex A and B are supported; Annex A is supported with
the following constraints):
•
81 – 1003 MHz frequency range
•
8 MHz channel width (fixed)
•
6.952 Msps symbol rate (fixed)
MER equalized
> 43 dB
1 kHz to 10 kHz
< –35 dBc
10 kHz to 50 kHz
< –54 dBc
50 kHz to 3 MHz
< –56 dBc
