Quick Eagle Networks DL3800E manual Bpv, Eb/Cv, Ses, Bbe

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	Table 4-3 NET Statistics Items (Continued)
Parameter	Definition
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.

4-14 DL3800E Inverse Multiplexer User’s Guide — July 9, 2001