Specifications

MDS 05-3438A01, Rev. E MDS 4790/9790 Series I/O Guide 37
Major Alarm Event
Assignments
AMASK [0000 0000–FFFF FFFF]
Table 9 and Table 10 listed the major and minor alarm classifications. It
is possible to reassign alarm outputs (illustrated in Figure 19 on
Page 21) to a different category, and change which alarm events trigger
an automatic switchover in redundant master stations. However, this
should be done rarely, if ever.
The
AMASK command and NMASK command (Page 45) command reclas-
sify major and minor alarm events, respectively, changing the alarm
output relay status and switchover conditions. These commands can be
used to tailor a radio’s alarm response. For example, a major alarm at a
redundant master station causes switch-over to the other transceiver
board. By re-configure a minor alarm as a major alarm, switch-over can
be forced at the occurrence of a (formerly) minor alarm condition.
Reclassifying alarms does not disable alarm notification. The front
panel
ALARM LED illuminate, the alarm event is logged, and the ALARM
and
STAT commands show the alarm status.
Entering the
AMASK command alone displays the current setting of
major alarm events in hexadecimal format. Entering the
AMASK com-
mand followed by an eight-digit hexadecimal number reassigns each of
the 32 possible alarm events as enabled or disabled, with respect to
major alarm output relay status and switchover criteria.
The hex value for the mask corresponds to the hex value for the
ALARM
command (see the
ALARM command description). Each bit that is a ‘1’
identifies the associated alarm event as a major alarm. Each bit that is a
‘0’ means that the alarm condition will not cause an alarm output relay
to be asserted, and will not cause a radio to switch over.
Contact Microwave Data Systems for more information on configuring
the alarm response.
0000 0020 26 The DC input supply voltage is out of tolerance. If the
supply voltage is too far out of tolerance, the radio may
not work.
0000 0010 27 LNA current fault. (LNA current is out of range.)
0000 0008 28 Total board current fault. (Total board current is out of
range.)
0000 0001 31 The radio’s internal temperature is approaching an
out-of-tolerance condition. If the temperature drifts
outside of the recommended operating range, the radio
may not work.
Table 10.Minor Alarm Conditions’ Hexadecimal
Alarm Code Event Num-
ber
Description
Alarm Masks screen, Page 71
A
B