Quick Eagle Networks DL3800E - Manual (Page 99)

Front Panel Interface 5-11
5
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. This count allows a user 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.
UAS Unavailable Seconds. This display provides the number of UAS that have occurred in
the accumulation period. At the onset of 10 consecutive SES events, a period of
unavailable seconds begins. These 10 seconds are part of the unavailable seconds
count. At the onset of 10 consecutive non-SES events, a new period of available time
begins. These 10 seconds are part of available time.
UAS only occurs at the onset of 10 SES.
ES, SES, and BBE are not counted during unavailable time. Rate parameters ESR,
SESR, and BBER are the ratio of the fault-seconds count to the total seconds in
available time.
Table 5-3 NET Statistics Items (Continued)
Parameter Definition