5-10 DL3800E Inverse Multiplexer User’s Guide — July 9, 2001
5
Pressing the DOWN ARROW from any of these displays will step you
through the last 96 15-minute intervals while displaying the number of
errors in each of the interval. From the Net STATISTICS MENU, press
Enter. When you see Net N CV, press Enter again. The first display will
read SEC. 455 VALID.8, showing the number of seconds in the current
interval, and the number of valid 15 minute intervals since the error
counters were l ast reset.
Pressing the DOWN ARROW button from this point in the menu will show
the number of Code Violations in the current interval (CUR 4). Pressing the
DOWN ARROW will display the total number of errors since the registers
were last reset (TOTL. 8). Pressing the DOWN ARROW from here will
cycle you through the last 96 fifteen-minute intervals (or however many
intervals exist since the counters were last reset), displaying the number of
Code Violations in each interval, starting with the most recent, i.e., 1 = 0.
The NET STATISTICS items are listed in Table 5- 3.
Table 5-3 NET Statistics Items
Parameter Definition
EFS Error Free Seconds (EFS) is calculated whenever ESR is calculated, and is the simple
percentage complement of ESR: EFS = 100.0 - ESR. When there have been UAS in
the statistics history for the past 24 hours, then EFS is set at 100%.
ESR Errored Second Ratio (ESR) is the ratio of ES to total seconds in available time during
a fixed measurement interval. The fixed interval is the last 24 hours before the current
15 minute interval. When there have been UAS in the statistics history for the past 24
hours, then ESR is set at 0%.
SESR Severely Errored Second Ration (SESR) is the ratio of SES to total seconds in
available time during a fixed measurement interval. The fixed interval to be used is
the last 24 hours before the current 15 minute interval. When there have been UAS
in the statistics history for the pa st 24 hours, then SESR is set at 0%.
BBER Background Block Error Ratio (BBER) is the ratio of errored blocks to total blocks
during a fixed measurement interval, excluding all blocks during SES and unavailable
time. The fixed interval is equal to the last 24 hours before the current 15 minute
interval.
BPV This display provides the number of Bipolar Violations (BPVs) that have occurred
during the accumulation period. A total of 15430 BPVs in a 10 second sliding
window (approximately 10-3) will create a Major Alarm and 916 BPVs in a 600
second sliding window (approximately 10-6) will create a Minor Alarm.
FE A Frame Error (FE) is declared when two out of four consecutive framing bits are in
error. Typically, an FE indication will be accompanied by a significant number of
payload data bit errors. This display provides the number of FEs that have occurred
in the accumulation period.