Quick Eagle Networks DL3800E - Manual (Page 54)

4-14 DL3800E Inverse Multiplexer User’s Guide — July 9, 2001
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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.
EB/CV An Errored Block (EB) is a block in which one or more bits are in error. The EB if
therefore equivalent to the Code Violation (CV) count calculated and displayed in the
previous versions of the DL3800E unit. This count allows you to monitor the rate of EB
faults on a line that is unavailable.
EBs are counted in the unavailable state; ES, SES, and BBE are not counted in the
unavailable state.
ES An Errored Second (ES) is a one-second period with one or more errored blocks (such
as one or more CRC4 errors) or an Out Of Frame (OOF). This display provides the
number of ESs that have occurred in the accumulation period. ESs are not
accumulated during UAS.
SES Severely Errored Seconds (SES) is a one-second period which contains 30% or more
errored blocks or at least one severely disturbed period (SDP). An SDP is present if
either a LOS, AIAS, or LOF occurs.
Since there are 1000 blocks per second, an SES is a one-second period which
contains either a combination of 300 or more CRC4 errors, an OOF, or at least one
of the following: LOS, AIS, or LOF. This requirement is a slight change from the prior
DL3800E unit SES definition, which required 320 or more CRC4 errors or LOS, AIS,
or LOF. SESs are not accumulated during UAS.
BBE A Background Block Error (BBE) is an errored block not occurring as part of an SES.
A BBE is calculated and displayed as a raw count of non-SES EBs. The count is
updated at the end of every measurement second excepting any second that is an
SES. The updated count is discarded for all UAS.
Table 4-3 NET Statistics Items (Continued)
Parameter Definition