Section 150-319-254
Revision 02
Page 5
4. ALARMS
4.01
An RS-232 connector (DB-9) on the front
panel provides access to HiGain
maintenance, provisioning and performance
monitoring interface. Basic functionality is available
via a 'dumb terminal'. For ‘dumb terminal’ operation
procedures, refer to Sections A.5.07 through A.5.11,
B.3, and C.3.
4.02
Pin H of the ELU-319 is the minor alarm
(MNRALM) output pin. This pin must never
operate above 0V or below -60V. The ELU-319
forces pin H to ground (maximum of 10 mA) for any
of the conditions listed below, with the
accompanying front panel message in bold letters.
More than one alarm condition can exist at any
given time, but the unit can display only one
message. For multiple alarms, only the highest
priority alarm appears. The alarms are listed in their
order of priority:
1) ALRM LOSW: Loss of synchronization in
either HDSL loop.
2) ALRM LLOS: Loss of ELU-319 G.703
input signal.
3) ALRM RLOS: Loss of ERU-412 G.703
input signal.
4) ALRM H1ES: An HDSL Loop 1
transceiver has exceeded the 24-hour
user-selected Errored-Seconds
threshold.
5) ALRM H2ES: An HDSL Loop 2
transceiver has exceeded the 24-hour
user-selected Errored-Seconds
threshold.
6) ALRM G.703: The total number of
bipolar violations (BPV) at the ELU or
ERU G.703 inputs exceeded the 24-hour
user-selected threshold.
7) ALRM MAL1 (2): The margin on HDSL
Loop 1 (Loop 2) has dropped below the
Margin Alarm Threshold value set from
the Maintenance Port menu.
4.03
Pin H (Figure 3) (MNRALM) of the ELU-319
remains grounded for the duration of the
alarm condition. The ELU-319 STATUS LED
flashes red for the duration of a minor alarm
condition. You can retire the MNALRM by pressing
the front panel SEL(ect) button, thus executing the
alarm cut-off (ACO) option. This turns the alarm off
and replaces the ALRM message with ACO. The
part of the message that defines the alarm remains
until the alarm condition clears or another alarm
occurs. Disabling the ALM also retires an ACO
condition.
4.04
Setting the ALM option to DIS(able) only
pre-
vents the unit from activating the MNRALM
output alarm bus on pin H on a minor alarm event.
The STATUS LED still flashes red and the ALRM
message still appears.
4.05
The ELU-319 drives pin 10 (FUSEALARM)
to -48V whenever its on-board fuse opens.
Its normally floating output must never operate
above ground or below -80V. It can sink a current of
10 mA.
4.06
The ELU-319 Line Unit front panel tri-color
STATUS LED has the following states:
•
GREEN - Normal operation
•
FLASHING GREEN - HDSL acquisition
•
FLASHING RED - MNRALRM (For all
alarm conditions)
•
RED - FUSEALRM
•
YELLOW - Self-test in progress or an
ELU-319 loopback in effect (CREM or
Network Local Loopback (NLOC))
