Digital Link DL3800 DS1, Руководство пользователя

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5-10 DL3800 DS1 Inverse Multiplexer User Guide—February 1999
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 the
ENTER
button.
When you see Net N CV, press ENTER again. The Þrst 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
last 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 the user
through the last 96 Þfteen-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 .
SEC YYY VALID. Z YYY = the number of seconds into the current interval.
Z = the number of valid 15 minute intervals since the error counters were
reset (0 through 96).
CUR. X X = the current interval.
TOTL. X X = the number of errors in the current interval.
Table 5-3 NET Statistics Items
Parameter Definition
CV A code violation. CV is a count of Frame synchronization bit errors (FE) in the Super
Frame (SF) format, or a count of the CRC-6 errors in the Extended Super Frame (ESF)
format occurring during the accumulation period.
ES An Errored Second (ES), in the case of ESF, is the count of one-second intervals
containing one or more CRC-6 errors, or one or more CS events, or one or more SEF
events. An SEF is a severely errored frame in which there are no LOS and no AIS
events.
ES-A In ESF format only, this is the count of one-second intervals with exactly one CRC-6,
no SEF, and no LOS events.
ES-B In ESF format only, this is a count of one-second intervals with no less than two and
no more than 319 CRC-6 errors, no SEF events, and no LOS events.
SES In ESF format, Severely Errored Seconds are defined as a count of one-second
intervals with 320 or more CRC-6 errors, or an SEF defect. In SF, it is the count of
one-second intervals with eight or more FE events or an SEF defect.
Table 5-2 NET Statistics Menu Information Display (Continued)
Front Panel Display Explanation