Comtech EF Data CDM-760 Installation And Operation Manual page 211

Ethernet Interface Operation
CDM-760 Advanced High-Speed Trunking Modem
Selection (Mask)
FCnC
Note the following:
Mask State
Alarm
Fault
Mask
Fault-Tx On
Click [Submit Settings] to save.
Event Description
Fractional Carrier-in-Carrier is common in 1:1 or 1:N redundancy
systems where the primary modem is running fully operational (i.e.,
FAST-activated) CnC, and the backup modem(s) uses FAST-
activated Fractional CnC.
When Fractional CnC is enabled, the modem generates an internal
fault and logs an event every 12 hours. A fault causes the normally-
online modem to revert to online if all faults are cleared. This is used
to prevent a Fractional CnC modem from draining all its fractional
time if the normally-online full CnC modem is no longer faulted.
Masking this fault prevents the Fractional CnC unit from forcing a
12-hour fault.
Front Panel LED
Modem Fault State
'UNIT STATUS' Color
Amber None
Rear panel J1 | ALARM connector
Red
None None
Rear panel J1 | ALARM connector
Red
7–44
Revision 4
MN-CDM760
Available Mask State
A F M
X X X
Front Panel Visible VFD
Location
Monitor: Live Alarms menu
Monitor: Stored-Events log
None: A masked event is not
logged and is not seen on any
front panel screen.
Monitor: Stored-Events log
F/T