Comtech EF Data CDM-760 - Page 211

Ethernet Interface Operation Revision 4
CDM-760 Advanced High-Speed Trunking Modem MN-CDM760
7–44
Selection (Mask) Event Description
Available Mask State
A
F
M
F/T
FCnC
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.
X X X
Note the following:
Mask State
Front Panel LED
‘UNIT STATUS’ Color
Modem Fault State
Front Panel Visible VFD
Location
Alarm
Amber None Monitor: Live Alarms menu
Fault
Red
Rear panel J1 | ALARM connector
Monitor: Stored-Events log
Mask None None
None: A masked event is not
logged and is not seen on any
front panel screen.
Fault-Tx On Red Rear panel J1 | ALARM connector Monitor: Stored-Events log
Click [Submit Settings] to save.