Comtech EF Data CDM-760 - Manual (Page 95)

Front Panel Operation Revision 2
CDM-760 Advanced High-Speed Trunking Modem MN-CDM760
6–9
Network
Spec
QPSK 8PSK 16APSK 32APSK 64APSK
DVB-S2-EB2
1/2, 8/15, 17/30,
3/5, 19/30, 2/3,
127/180, 3/4,
4/5, 5/6, 31/36,
8/9, 9/10
17/30, 3/5,
19/30, 2/3,
127/180, 3/4,
4/5, 5/6, 31/36,
8/9, 9/10
19/30, 2/3,
127/180, 3/4,
4/5, 5/6, 31/36,
8/9, 9/10
127/180, 3/4,
4/5, 5/6, 31/36,
8/9, 9/10
4/5, 5/6, 31/36,
8/9, 9/10
ACM Auto Auto Auto Auto Auto
(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 64,800 This is the default (standard) setting.
Short 16,200
Short Block Framing performs 0.2 db to 0.3 db worse in terms of
required Es/No for all ModCods.
(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.
6.2.2.2.2 (CONFIG: Tx) Data
Tx Data Rate Tx Symbol Rate
()
Use the   arrow keys to select Tx Data Rate or Tx Symbol Rate. Press ENTER.