Issue 1, Section 150-231-164
Revision 04
Page 5
3)
ALRM RLOS: Loss of HRU-412 DS1 input
signal.
4)
ALRM TLOS: The DS1 input to a List 6 or 7
HRU-412, whose TLOS switch option has
been enabled, is not present (LOS).
5)
ALRM H1(2)ES: HDSL Loop 1 or Loop 2 has
exceeded the 24 hour user-selected Errored-
Seconds Cyclic Redundancy Check (CRC)
threshold.
6)
ALRM DS1: The total number of Bipolar
Violations (BPV) at the HLU-231 List 6D or
HRU-412 T1 inputs have exceeded the 24-
hour user-selected threshold.
7)
ALRM MAL 1 (2): The margin on HDSL Loop
1 or Loop 2 has dropped below the minimum
threshold value set by the terminal MARGIN
ALARM THRES; as described in Section 5.
4.02
The HLU-231 List 6D STATUS LED flashes
RED for the duration of a minor alarm condition.
Alarms 5 & 6 can be inhibited by selecting NONE for the
Errored Seconds Alarm (ESAL) system option. See
Section B Paragraph 5, and Section C Paragraph 5 for
System Settings information. The MAL1(2) alarm can
be disabled by setting the margin alarm threshold to 0.
A Minor Alarm can be retired by executing the Alarm Cut
Off (ACO) option. This is accomplished by pressing the
SEL button on the front panel. This turns the alarm off
and replaces the “ALRM” message with the “ACO”
message. The second part of the “ALRM” message,
which defines the cause of the alarm, remains. Both
messages remain until the alarm condition clears or
another alarm occurs.
4.03
Note that when both HDSL loops lose sync word
(LOSW), a minor alarm condition exists but
because the HLU-231 List 6D enters a self test cycling
mode, the front panel LED lights yellow instead of red
and the “SELF TEST” message is displayed instead of
the “ALRM” message.
4.04
Setting the ALM option to DIS only prevents the
alarm relay from operating on a minor alarm
event. The STATUS LED still flashes red and the
“ALRM” message is still displayed.
4.05
Pin 32, FUSEALARM, is driven to -48 V and the
front panel STATUS LED turns red whenever
the on board fuse opens.
4.06
The HLU-231 List 6D front panel tri-color
STATUS LED has the following states:
•
GREEN - Normal Operation.
•
FLASHING GREEN - HDSL Acquisition.
•
FLASHING RED - Minor Alarm (For
conditions see Paragraph 4.02).
•
RED - FUSEALRM.
•
YELLOW - Self Test in process or an HLU-
231 List 6D loopback in effect (CREM) or
(NLOC) (Sections B Paragraph 3, and
Section C Paragraph 3).
•
FLASHING YELLOW - The HLU-231 List
6D is in an ARMED state.
5. OPTIONS
5.01
The HLU-231 List 6D contains a non-volatile
RAM (NVRAM) which stores the system option
settings. No dip-switches or jumpers are required to
configure the HLU-231 List 6D. The options are set via
push-buttons on the front panel, or through the RS-232
interface. They are retained if shelf power is lost or if
the HLU-231 List 6D is unplugged. Table 1 lists the
HLU-231 List 6D option settings. Figure 9 and Figure 21
illustrate the same options on the HLU-231 List 6D non-
Doubler and Doubler System Settings Menu Screens,
respectively. In the System Settings menu (which is
identical for both non-Doubler and Doubler applications)
the settings shown represent the factory default settings.
5.02
The SETUP (MODE and SEL) momentary
push-buttons are used to set the options from
the HLU-231 List 6D Front Panel. To initiate the
OPTION SETTING mode, press the MODE button at
least for one second, but less than three seconds, and
release. The message displayed on the front panel
alternates between the first system parameter and its
current setting. Pressing the SEL button steps the
display through all possible settings (one at a time) of
the parameter being displayed. After the desired setting
has been selected, press the MODE button. This
updates the current displayed mode to the setting
selected, then selects the next configurable parameter.
After the last parameter has been selected, the display
shows “CONF NO” (Confirm? (Yes/No)). If the MODE
button is now pressed, none of the changed parameters
are installed. If the SEL button is pressed, a “YES”
message is displayed and the selected changes are
installed. In either case the display returns to its normal
mode. The display also returns to its normal mode,
without installing any new changes, if neither button is
pressed for 30 seconds.
