Section 150-319-251
Revision 01
Page 7
7.19
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.
7.20
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.
7.21
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
conditions see paragraph 6.17)
•
RED - FUSEALRM
•
YELLOW - Self-test in process or an ELU-
319 loopback in effect (CREM or Network
Local Loopback (NLOC))
8. SYSTEM PARAMETER SETTINGS
8.01
The operating mode of the ELU-319
depends on the settings of the following
system operating parameters:
•
PWRF—Power Feed (HDSL line power)
•
ESAL—Errored Seconds Alarm Threshold
•
LBTO—Loopback Timeout
•
ALM—Minor Alarm
•
MARG—Margin Alarm Threshold
8.02
Table 3 lists the ELU-319 system
parameters and their optional settings. The
ELU-319 stores the settings of the system
parameters in non-volatile RAM to prevent their loss
in the event that shelf power is lost or the ELU-319
is unplugged.
8.03
No DIP-switches or jumpers are required to
set the ELU-319 configuration. You can set
the ESAL, LBTO, and MAL system parameter
options with the front panel pushbuttons (MODE and
SEL); you can set all parameters from the
maintenance terminal through the ELU-319 RS-232
interface as described in Section 8.
8.04
To initiate the Option Set mode from the
ELU-319 front panel, press and hold the
MODE button for one second. The front panel
message alternates between the system parameter
and its current setting. Press the SEL button to step
through all possible values (in sequence) of the
parameter being displayed. Press MODE when the
desired setting is displayed. This selects the next
configurable parameter. When you have selected
the last parameter, the display displays “CONF/NO”.
To return to original settings, press the MODE
button. To accept the new settings, press the SEL
button. This displays “CONF/YES”, installs the
changes, and returns to normal display mode. If you
do not press either button within 30 seconds, the
parameters return to their original values, and the
display returns to normal mode.
8.05
To set all parameters to their default values,
press and hold the SEL button for six or
more seconds. The message “DFLT/NO” appears
when you release the button. Press SEL again to
display “DFLT/YES” and accept the default values.
Press MODE to cancel and return to the original
values.
8.06
Press the MODE button for 3 or more
seconds to scroll through the ELU-319
software version number, List #, and all parameter
option settings.
