Verilink 2048 (34-00179) Product Manual - Manual (Page 26)

4-6 Terminal Operation 2048 PMU/NTU
[ USER ] [ DTE ] – Display the Near or Far PMU user per-
formance registers for the DTE.
[ TELCO ] [ NET ] – Display the Near or Far PMU PTT per-
formance registers for the network.
[ TELCO ] [ DTE ] – Display the Near or Far PMU PTT per-
formance registers for the DTE.
Error Events: This field displays the running total of ESF
error events for the circuit selected in ‘
Element ’ and is
applicable only when ‘ Target ’ is set to [ USER ]. This
count accumulates until it reaches 65535 or is reset by
pressing <return> with the (
RESET ) field highlighted.
Reset Performance Registers: This field allows the ele-
ment registers to be reset. It may only be used when the
‘
Target ’ field is set to [ USER ] on the USER and SUPV
ports or [ TELCO ] on the PTT port. If <return> is pressed, a
warning prompt appears. To exit without performing the
reset function, press <return> with
(NO) selected. To pro-
ceed with the reset, press <return> on (YES) . All values for
the chosen register set (NET or DTE) are then reset to zero.
[Standard 24 Hour]: Toggling this field with the <space-
bar> steps through the four available performance screens.
The remainder of the fields in the ‘Performance’ screen are
for display only. They are defined as follows:
Status: This field displays the selected E1 line status
derived from the type (or absence) of errors in the received
data. The status represents the immediate state of the
received E1 signal and is not related to the alarm thresholds.
This field shows one or more of the signal conditions listed
in Table 4 -2 on page 4-8.
Completed Days: This field displays the number of days
which are included in the 30-day totals.
Completed Intervals: This field displays the number of
15 -minute intervals in the last 24-hour period since the reg-
isters were last cleared (a 24- hour period may contain up to
96 intervals).
24 Hr.% Error Free: This field displays the percentage of
error free seconds within the last 24 hours or since the event
registers were last cleared. It is based only on the ES and
UAS parameters.
(performance data): The main body of display data con-
sists of error events for three different periods: The first dis-
play line shows the data accumulating for the current
interval (from 0 to 900 seconds). The second line shows the
totals for the last 24-hour period (or the last 96 fifteen-
minute intervals). The third line shows the 30-day totals.
The remaining lines of this screen show the data for any
intervals containing errors. Interval 1 is the most recently
stored 15-minute interval and interval 96 is the oldest in the
current 24-hour period. On the 30-day screens, interval 30
is the oldest 1-day interval in the current 30-day period.
The real time (or date on the 30-day screens) of the interval
beginning is shown in the first column.
If more than five errored intervals have elapsed, [PAGE -
DN] appears to the left of the performance data. Pressing
<return> on this field displays the next five errored intervals.
[PAGE - UP] appears once [PAGE - DN] is used. Pressing
<return> on [PAGE - UP] displays the previous five errored
intervals. Only intervals that contained errors are displayed,
which eliminates rows of zeroes. If an interval is not dis-
played, no errors were detected in that time period.
NOTE: The parameters shown on the ‘Performance’
screens are updated at 5 second intervals.
The ‘ Standard 24 Hour ’ and the ‘ Standard 30 Day ’
performance data consists of the following parameters:
ES: The errored seconds parameter represents the count of
one-second intervals with any of the following conditions:
• One or more OOF conditions, which is 3 consecutive
frame alignment signal (FAS) errors.
• One or more SLIP conditions.
• One or more CRC4 errors (CRC4 mode).
• One or more FAS errors (non-CRC4 mode).
BES: The bursty errored seconds parameter is the count of
one-second intervals with any of the following conditions:
• More than 1 and less than 805 CRC4 errors
(CRC4 mode).
• More than 1 and less than 16 FAS errors
(non-CRC mode).
This corresponds to a bit error rate limit of 10
- 3
.
SES: The severely errored seconds parameter is the count
of one-second intervals with any of the following:
• One or more OOF conditions.
• One or more SLIP conditions.
• 805 or more CRC4 errors (CRC4 mode).
• 16 or more FAS errors (non-CRC mode).
UAS: The unavailable seconds parameter is a one-second
interval during which the ‘Unavailable State’ is declared,
according to the following conditions:
• An Unavailable State is declared when 10 consecutive
SES conditions occur.
• An Unavailable State is cleared if no SES conditions
occur for 10 consecutive seconds.