150-319-151-01, Revision 01
Appendix A - Specifications
HLU-319 List 5A
September 17, 1999
59
Fuse Alarm
Pin 10 on the card-edge connector is a Fuse Alarm that is driven to -48 Vdc whenever its onboard fuse opens. It
emulates the function of the Fuse Alarm output from Pin 10 on normal, high-density (HD) repeaters. Pin 10 is
connected to pin 5 of the 1184 Alarm Card (slot 1 in the HD shelf) and causes the 1184 Fuse ALM LED to light
when the pin 10 signal is activated. Its normally floating output must never be driven above ground or below
-80 V. It can sink a current of 10 mA. The HLU-319 does not support the BPV function (Pin E) of normal HD
repeaters.
System Alarm Output Pin
Pin H on the card-edge connector (see
) is the HLU-319 System Alarm output pin. The following notes
apply to Pin H:
•
Pin H replaces the Local Loss of Signal (LLOS) on normal high-density (3192) repeaters.
•
The normally floating output of Pin H can connect to pin 1 of the 1184 or 3192-9F Alarm Card in position 29
of the High Density (HD) shelf.
•
The HLU-319 forces pin H to +5Vdc (maximum of 10 mA) for a system alarm condition. Pin H then remains
at +5 Vdc for the duration of the alarm condition.
•
If the Wescom 1184 Alarm Card is installed in the shelf, its LOS LED lights for every MNRALM.
•
The HLU-319 Status LED flashes red for the duration of a system alarm condition.
•
Setting the ALM option to DIS only prevents the system alarm bus on Pin H from being activated for a system
alarm event. The Status LED still flashes red and the ALRM message still displays.
Pin H must never be taken above +5 Vdc or below -60 Vdc.
