LAPS Operation
4-5
1558A APS
headers along with the circuit’s position designator. All of
these are found in the upper left corner of the display.
NOTE: Pressing the <esc> key will take the user back to
the previous circuit list screen.
The Performance screen contains four fields which can be
altered by the user. The function of these three fields is dis-
cussed in the following paragraphs:
Target: Signifies which section of the selected circuit is
presently displayed. Pressing <space bar> will change this
field to the next selection. The choices are: ‘Side A, Near’,
‘Side B, Near’, ‘Side A, Far’, and ‘Side B, Far’. Far Targets
can only be accessed if the far unit is a slave 1558A.
‘Near’ refers to the data received by the 1558A that the user
is physically attached. ‘Far’ refers to the data received at the
1558A unit at the remote or far end. Detailed information is
displayed for each selection as described in the following
paragraphs.
Reset ESF Events: This field is both a display field and a
user command field. It shows the running total of ESF error
events for the circuit section selected in the ‘Target’ field.
This count accumulates until it reaches 65535 or is reset by
the user. The count can be reset by moving the highlighted
cursor to this field and pressing <return>. Note that only
1558A units configured as the Master are allowed to reset
the ESF performance registers. Slave units are not allowed
to reset performance registers.
Reset Event Regs: This is a command field. Moving the
cursor to this field and pressing <return> will cause all inter-
val data for the selected circuit section to be cleared. Note
that only 1558A units configured as Master are allowed to
reset the ESF performance registers. Slave units are not
allowed to reset performance registers. The performance
interval data is discussed in more detail below.
SWO History: This command field is used to access the 30
day Switch Occurrence History screen. To access this infor-
mation, move the cursor highlight to the SWO History field
and press <return>. The system responds by displaying the
Occurrence History display (see
Screen 4-5
). This display
lists the last thirty day completed periods (24 hours) and the
number of switch occurrences for each of those days. The
Far SWO occurrences can be viewed from the master 1558A
by selecting Net End Far. Note that Slave units cannot
access far information.
The remainder of the fields in the Performance Screen are
for display only. They are defined as follows:
Status: The status of the currently selected circuit section.
This status is the same as that detailed for “Near” on the
previous page.
24 Hr.% Error Free: This is the percentage of intervals
that were error free in the last 24 hours or since the event
registers were last cleared.
Completed Intervals: The number of 15-minute intervals
for which performance data has been collected. The maxi-
mum number is 96 (there are 96 fifteen minute intervals in a
24 hour period).
Event Free Intervals: The number of intervals that perfor-
mance data has been collected without ESF error events.
(Interval Data): Per AT&T technical references 54016
and 54017, the interval data consists of Errored Seconds
(ES), Consecutive Severely Errored Seconds (CSES), Loss
of Frame Count (LOFC), Switch Occurrences (SWO), Dura-
tion (DUR), Unavailable Seconds (UAS), Severely Errored
ID: HICAP 1234
TxPORT 1559 APS Manager
Date: MM/DD/YY
ID: HICAP 5678
<APS LOCAL ACCESS>
Time: HH:MM:SS
Shelf/Pos: 1.01
Ver. X.XX/X.XX
--------------------------------- Performance
----------------------------------
Target: [Side A, Near] Status: Active 24 Hr. % Error Free:
95%
Reset ESF Events: 128 SWO History: Completed Intervals:
80
Reset Event Regs: Event Free Intervals: 76
Time Interval ES CSES LOFC SWO DUR UAS SES BES
08:01 Current 0 0 0 0 481 0 0 0
----- 24 Hour 9 0 0 8 72001 0 9 0
10:15 [1] 1 0 0 0 899 0 9 0
15:00 [78] 0 0 0 1 476 0 0 0
14:45 [79] 5 0 0 6 435 0 5 0
14:30 [80] 3 0 0 1 888 0 3 0
----------------------------------- Messages
-----------------------------------
Alarms
Screen 4 -4
Performance
