Issue 1, Section 150-231-134
Revision 01
Page 9
9. SYSTEM OPTION SETTINGS
9.01
The HLU-231 contains a non-volatile RAM
which stores the system option settings. No
dip-switches or jumpers are required to set the HLU-
231 configuration. The options are set via
pushbuttons on the front panel or through the RS-232
interface. The options are retained if shelf power is
lost or if the HLU-231 is unplugged. Table 3 lists the
HLU-231 option settings. Note that only those options
enclosed by quotes can be set by the front panel
buttons. All 14 options can be set via the RS-232
port. Figure 13 illustrates the set-up menu used to set
these options from the RS-232 port. The settings
shown in the second column of Figure 13 represent
the factory default settings. The third column values
(in parenthesis) indicate the other parameter options.
9.02
The SETUP (MODE and SEL) momentary
pushbuttons are used to set the four options
shown in quotes in Table 3 from the front panel. To
initiate an OPTION SETTING mode, press the MODE
button for one second and release. The message
displayed on the front panel alternates between the
system parameter and its current setting. Pressing the
SEL button steps the display through all possible
settings (one at a time) of the MODE (parameter)
being displayed. After the desired setting has been
chosen, press MODE. This does two things. First it
updates the current displayed mode to the setting
chosen. It then selects the next configurable
parameter. After the last parameter has been
selected, the displays shows CONF/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 chosen 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.
9.03
All 14 user options can be set to their default
values by pressing the SEL button for six
seconds. When released, the message: ”DFLT NO”
appears. To install the default values press the SEL
button again. The “YES” will follow indicating that the
default values are now in effect. To terminate this
DFLT mode without reverting the options to their
default values, press the MODE button or do nothing
for 30 seconds. The latter returns the display to its
normal state.
9.04
Pressing the MODE button for three or more
seconds causes the display to scroll through
the HLU software version number, its List # and the
type of frame pattern being received from the DSX-1,
if the FRMG option is set to AUTO. If FRMG is set to
UNFR, it displays UNFR. See Table 10 for these
additional messages. The line code parameter mimics
the line code setting LNCD: AMI or B8ZS.
9.05
The CIRCUIT ID option is set by choosing the
“H” option from the dumb terminal main menu
shown in Figure 6. The message “enter circuit ID #:
24 characters max” follows the “H” selection. Press
the RETURN key after entering the chosen set of
alpha-numeric ID characters; choose “C” to confirm.
Note if more than 24 characters are entered, a “Beep”
is emitted and only the first 24 characters are
accepted. The ID appears in all HLU screens as
shown in Figures 6 through 30. The ID does not
appear on the HRU screens when the maintenance
port is accessed at the remote unit. Note that the
Circuit ID is not set to its default (all blanks) setting
when the DFLT setting option is utilized.
9.06
To set the DS0 BLOCKING option first select
the SYSTEMS SETTINGS (“C” choice) from
the main menu. The menu shown in Figure 13
appears. Enter the letter “B” shown in parenthesis of
the DS0 blocking selection. The DS0 channels are
blocked or unblocked by entering each channel’s
number. Multiple channels can be selected by
inserting a space between each entry. After all the
new settings have been made, enter “E” for exit and
then “C” for confirm. The new choices are now
installed. If DS0 blocking is invoked in a HiGain
system that has an earlier version HRU that does not
support the blocking option, blocking will only occur at
the DS1 output of the HLU. The HRU DS1 output will
not be blocked. Also, all blocked channels are opened
for all HiGain loopback tests. This allows the standard
full bandwidth T-1 loopback tests to be performed.
9.07
To set the MARGIN ALARM THRESHOLD
select “G” from the system settings menu.
Enter the desired minimum acceptable alarm
threshold from the 0 to 15 dB range. This causes a
minor alarm to occur if either the margin on HDSL
loop 1 (MAL1) or loop 2 (MAL2) drops below the
selected threshold value. Since the margin can never
drop below 0, choosing “0” for the margin threshold
turns the margin alarm off.
9.08
The other dumb terminal system settings are
set in a similar manner. Enter the letter in
parenthesis of the parameter to be changed. Each
entry of this letter scrolls the parameter to its next
value. Press the ENTER key after each selection is
made. After all selections have been made, enter “E”
and then “C” to the resulting Confirm message. This
activates the new choices and returns control to the
main menu.
