Comtech EF Data CDM-425 Installation And Operation Manual page 694

Step
Target Eb/No margin: This is a VERY
important parameter. The ACM system is
designed to switch based on thresholds
that correspond to a BER of 5 x 10
each ModCod. However, in order to
prevent oscillation around two ModCods
at this exact value, 0.3 dB of hysteresis
has been added. The switch points and
the hysteresis are shown in Figure K-3.
7 (SELECT) CONFIG: IP  Switch-set-up
 WAN
Enter the desired size of the WAN Buffer.
The minimum size is 20 milliseconds, and is
referred to the data rate corresponding to
ModCod0. In order to achieve minimum
system latency, do not make this value
unnecessarily large. Note that this does not
apply if the Packet Processor Card is
installed.
Appendix K
Task
Target Eb/No Margin = 1.0 dB (0.0 – 4.5)
for
-8
Ethernet Switch: Mode
MAC-Learning VLAN Qos Stats
Figure K-3. ACM ModCod Switch Points
K–14
CDM-425 Advanced Satellite Modem
Front Panel VFD Mnemonic
WAN PerPortCnfg
Revision 0
()
()
MN-CDM-425