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Appendix A - Specifications LTPH-UM-1049-02, Issue 2
70 January 9, 2002 H2TU-C-319 List 4E
System Alarm Output Pin
Pin H on the card-edge connector, shown in Figure 33, is the H2TU-C 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 H2TU-C 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 H2TU-C 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.
• “System Alarms” on page 52 describes the system alarms that activate pin H.
Pin H must never be taken above +5 Vdc or below -60 Vdc.