ADTRAN 1500 - Manual (Page 9)

61180009L1-5D Issue 4, May 2006 9
• Revertive: This option allows the unit to revert to
the primary timing source if and when it becomes
available.
• Non-revertive: This option allows the unit to
remain on the secondary timing source. If Non-
revertive is chosen and the secondary timing
source becomes active due to a primary timing
source failure and the secondary source fails, the
unit will switch to the primary timing source if it
has become available.
2. Primary Timing Source: This option is used to
select the primary timing source for the T1s.
Options include the following:
• Local
• Loop A
• Loop B
• CLK
3. Secondary Timing Source: This option is used to
select the secondary timing source for the T1s.
Options include the following:
• Local
• Loop A
• Loop B
• CLK
This timing source will become the current timing
source if the primary timing source is lost. If both
timing sources are lost, the timing reverts to local.
As timing sources are regained, the current timing
source reverts to the primary or secondary timing
source as they become available.
Time Slot Assignment
Used to assign time slots when the bank is in manual
map mode. This option allows time slots to be assigned
by T1-A, T1-B, or by the card slot.
Status Screen
The Dual LIU Status screen is used to quickly view the
status of the loops, the provisioned settings for each T1,
the bank mode, M.T.A. status, the settings for primary
and secondary timing, and the status of the timing
source.
Alarms Menu
The Dual LIU Alarms menu is used to enable or disable
the external clock alarms. These alarms should be
enabled when a timing source is connected to the
external clock pins.
Test Menu
The Dual LIU Test menu is used to perform loopbacks,
select which T1 is monitored by the front panel monitor
jacks, or reset the Dual LIU.
Performance Monitoring Menu
The Dual LIU collects and stores the Performance
Monitoring (PM) information statistics for each of the
T1s. This PM information is stored in non-volatile
memory and is accessible through the Performance
Monitoring menu. A brief description of the various
options follows:
1. Daily: This option is used to display daily counts
of multiple performance monitoring statistics.
2. Far-End Daily: This option is used to display
daily counts of multiple performance monitoring
statistics associated with the far-end.
3. Qtr-Hour: This option is used to display counts of
performance monitoring statistics in seven 15-
minute intervals.
4. Far-End Qtr-Hour: This option is used to display
counts of performance monitoring statistics in
seven 15-minute intervals associated with the far-
end.
5. Daily Threshold: This option is used to set
threshold points for daily counts and enable or
disable an alarm that would occur when this
threshold is exceeded.
6. FE Daily Threshold: This option is used to set
threshold points for far-end daily counts and enable
or disable an alarm that would occur when this
threshold is exceeded.
7. Qtr-Hour Threshold: This option is used to set
threshold points for 15-minute counts and enable
or disable an alarm that would occur when this
threshold is exceeded.
8. FE Qtr-Hour Threshold: This option is used to
set far-end threshold points for 15-minute counts
and enable or disable an alarm that would occur
when this threshold is exceeded.
9. Reset Performance Registers: This option is used
to reset all performance registers.
10. Restore Factory Default Thresholds: This option
is used to reset thresholds back to factory defaults.
11. Enable all LIU Threshold Alarms: This option is
used to enable all Dual LIU threshold alarms.
12. Disable all LIU Threshold Alarms: This option is
used to disable all Dual LIU threshold alarms.