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Front Panel Operation
CDM-760 Advanced High-Speed Trunking Modem
Network Spec
DVB-S2-EB2
DVB-S2X
ACM
(CONFIG: Tx) Mod Frame
You should consider the use of Short Block Framing only when there is a concern about
data latency. In all other circumstances, Normal Block Framing should be used. See
Figure C-4 Single Hop Latency in Appendix G. ADAPTIVE CODING AND MODULATION
(ACM) OPTION for an illustration of how Normal and Short Block Framing affects
overall system latency.
Use the arrow keys to select Normal (default) or Short Block. Press ENTER.
Note the following:
Setting
FECFRAME Bits Enabled Remarks
Normal
Short
(CONFIG: Tx) Mod Pilot
Use the arrow keys to select Pilots as On or Off, then press ENTER:
•
On enables the insertion of pilot symbols into the physical layer frame
•
Off disables this insertion
When Pilot is On, pilots are always placed at the average power point of any
constellation.
QPSK
8PSK
1/2, 8/15, 17/30,
17/30, 3/5, 19/30,
3/5, 19/30, 2/3,
2/3, 127/180, 3/4,
127/180, 3/4, 4/5,
4/5, 5/6, 31/36, 8/9,
5/6, 31/36, 8/9,
9/10
9/10
¼, 13/45, 1/3, 2/5,
5/9L, 26/45L, 3/5,
9/20, ½, 11/20,
23/36, 2/3, 25/36,
3/5, 2/3, 3/4, 4/5,
13/18, 3/4, 5/6, 8/9,
5/6, 8/9, 9/10
9/10
Auto
Auto
64,800
16,200
16APSK
19/30, 2/3,
127/180, 3/4, 4/5,
5/6, 31/36, 8/9,
9/10
1/2L, 5/9L, 26/45,
3/5, 3/5L, 28/45,
23/36, 2/3L, 2/3,
25/36, 13/18, 3/4,
7/9, 4/5, 5/6, 77/90,
8/9, 9/10
Auto
This is the default (standard) setting.
Short Block Framing performs 0.2 db to 0.3 db worse in terms of
required Es/No for all ModCods.
6–9
Revision 4
MN-CDM760
32APSK
64APSK
127/180, 3/4, 4/5,
4/5, 5/6, 31/36, 8/9,
5/6, 31/36, 8/9,
9/10
9/10
2/3L, 32/45, 11/15,
32/45L, 11/15, 7/9,
3/4, 7/9, 4/5, 5/6,
4/5, 5/6
8/9, 9/10
Auto
Auto
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