Comtech EF Data ODM-840 - Manual (Page 118)

ODM/R-840 Outdoor Remote Router Revision 0
Ethernet-based Remote Product Management MN-ODM840
5–30
o
VersaFEC MODCOD 4 – QPSK 0.803
o
VersaFEC MODCOD 10 – 16-QAM 0.829
o
VersaFEC MODCOD 5 – 8-QAM 0.642
o
VersaFEC MODCOD 11 – 16-QAM 0.853
• Target Es/No Margin – Use the drop‐down menu to select a margin value, in 0.5 dB
increments, from 0.0 to 4.5 dB.
The ACM system is designed to switch based on thresholds that correspond
to a BER of 5 x 10
‐8
for each MODCOD. However, in order to prevent oscillation
around two MODCODs at this exact value, 0.3 dB of hysteresis has been added.
Click [Submit] to save these setting changes.
Tx ACM Status (read-only)
Information is presented in this section as follows:
• Seconds since last LQRM – Amount of time in seconds since an LQRM (Link Quality Report
Message) message was received.
• Max Seconds since last LQRM – Maximum amount of time since last LQRM message was
received.
• Last Reported Es/No – EsNo value received in the last LQRM message.
• Current MODCOD – Currently selected MODCOD.
• Current DataRate – Current data rate based on current symbol rate and MODCOD.
Tx ACM Events (read-only)
In addition to the date‐ and time‐stamp assigned for each event, information is presented in this
section as follows:
• Reported ES/No – EsNo value.
• New MODCOD – Newly selected MODCOD.
• New Tx DataRate – New data rate based on new MODCOD and current symbol rate.
Click [Clear ACM Events] to clear all ACM statistics from the buffer.