Alarms - PairGain HiGain HLU-319 Manual

Revision 01

Alarms

Pin H is the HLU-319 List 4B minor alarm (MNRALM) output pin. It is
normally floating and must never be driven above +5 V or below -60 V. The
HLU-319 forces pin H to +5V (maximum source of 10 mA) for any of the
conditions listed below. More than one alarm condition can exist at any given
time, but only one message can be displayed. In the case of multiple alarms,
the highest priority alarm is displayed. The alarms listed below are in order
of priority:
1 ALRM LOSW: Either HDSL loop lost sync.
2 ALRM LLOS: Loss of HLU DSX-1 input signal.
3 ALRM RLOS: Loss of HRU DS1 input signal.
4 ALRM TLOS: A user option that, when enabled, causes a logic loopback
in the HRU-412 List 8B when there is a loss of DS1 signal at the
HRU-412 List 8B.
5 ALRM H1ES: HDSL loop 1 has exceeded the 24 hour user-selected
Errored Seconds CRC threshold. If both H1ES and H2ES occur, only
H1ES is displayed on the front panel.
6 ALRM H2ES: HDSL loop 2 has exceeded the 24-hour user-selected
Errored Seconds CRC threshold. If both H1ES and H2ES occur, only
H1ES is displayed on the front panel.
7 ALRM DS1: The total number of bipolar violations (BPV), at either the
HLU or the HRU DS1 inputs, have exceeded the 24-hour user-selected
threshold.
8 ALRM MAL1: The margin on HDSL loop 1 has dropped below the
minimum threshold value set on the System Settings menu.
9 ALRM MAL2: The margin on HDSL loop 2 has dropped below the
minimum threshold value set on the System Settings menu.
Pin H, MNRALM, remains at +5V for the duration of an alarm condition. If
the Wescom 1184 Alarm Card is installed in the shelf, its LOS LED lights for
every MNRALM. The HLU-319 List 4B Status LED flashes red for the
duration of a minor alarm condition. Alarms 5 and 6, above, can be inhibited
by selecting None for the ESAL system option on the Systems Setting menu.
The MAL alarms (8 and 9, above) are disabled by setting the margin alarm
threshold to 0 (on the Systems Settings menu). A minor alarm can be retired
by executing the Alarm CutOff (ACO) option by pressing the SEL button on
6
December 22, 1997
PairGain Engineering - Plant Series
150-319-142-01
HLU-319 List 4B