Comtech EF Data CDM-625 - Manual (Page 251)

CDM-625 Advanced Satellite Modem Revision 15
Ethernet-based Remote Product Management MN-CDM625
6–59
6.5.4.3.12 Configuration | MEO (Mid-Earth Orbit)
MEO is non-functional when the optional CnC card is installed.
Figure 6-32. Configuration | ANT | SNTP page
CDM-625 modems are configurable for continuous pairing as Primary and non-Primary Modems
in an Antenna Handover System when the MEO (Medium Earth Orbit) feature is enabled.
Ethernet data traffic is transmitted and received via the Primary and Non-Primary CDM-625’s
four 10/100 Ethernet ports. The Antenna Handover signal received from the user-supplied IF/RF
switch determines which modem is the ONLINE or OFFLINE unit:
• The ONLINE unit transmits traffic only to the WAN side while, at the same time, the OFFLINE
unit’s Tx is muted.
• Both the ONLINE and OFFLINE units receive the satellite traffic, but only the ONLINE unit
forwards traffic to the LAN side while the OFFLINE unit drops the packets.
• Any time a unit switches from the OFFLINE to ONLINE state, the traffic destined for the WAN
is buffered, preconfigured in milliseconds (base modem → Antenna Handover delay).
MEO
Use the drop-down list to select the MEO Feature operation as Disabled or Enabled. Click
[Submit] to save this setting.
Antenna Handover
• Feature – Use the drop-down list to select the Antenna Handover Feature operation as
Disabled or Enabled.
• Mode – Use the drop-down list to select the enabled Antenna Handover Feature switching
operation as Manual or Automatic.
• Differential Path Delay – Enter a DPD limit value from -30 to +30.
Click [Submit] to save these settings.