PairGain HiGain HLU-319 Manual page 13

150-319-142-01
the front panel. This turns the alarm off and replaces the alarm message with
the ACO message. However, the second part of the alarm message, which
defines the cause of the alarm, remains. The ACO message and the cause of
the alarm remain until the alarm condition clears or another alarm occurs.
Disabling the alarm also retires an ACO condition.
Setting the alarm option to disable prevents the activation of the minor alarm
output alarm bus on pin H during a minor alarm event. The Status LED still
flashes red and the alarm message is still displayed.
The HLU-319 List 4B Pin 10 FUSE ALARM is driven to -48 V whenever its
on-board fuse opens. Its normally floating output must never be driven above
ground or below -80 V. It can sink a current of 10 mA.
Pin 7 is the NMA serial bus. It allows access to the HMU-319 List 5B, which
provides shelf management.
HLU-319 List 4B
December 22, 1997
PairGain Engineering - Plant Series
Revision 01
7