HP ProCurve Secure 7000dl Series Basic Management And Configuration Manual page 210

Secure router procurve 7000dl series

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Configuring E1 and T1 Interfaces

ProCurve Secure Router Modules

The following is a list of the line errors and a brief description of each.

BES. A Bursty Errored Second (BES) is a one-second time period with

between one and 320 Path Coding Violation (PCV) events, no Severely Errored

Framing Seconds (SEFS) defects, and no detected incoming Alarm Indication

Signal (AIS) defects.

CSS. A Controlled Slip Second (CSS) is a one-second interval containing one

or more controlled slips. A controlled slip is the replication or deletion of the

payload bits in a DS1 or E1 frame. This problem may be caused by a difference

between the timing of the interface sending and the interface receiving the

DM. A Degraded Minute (DM) is a one-minute interval with a bit error rate

(BER) that is higher than .000001. The one-minute intervals are derived by

removing severely errored seconds (SESs) from the total time and then

consecutively grouping the remaining seconds into blocks of 60.

ES. An Errored Second (ES) is a one-second period with one or more errored

blocks or bit errors. For T1-carrier lines that use ESF and E1-carrier lines that

use CRC4, one of the following occurs during the one-second period:

one or more PCVs

one or more Out of Frame (OOF) defects (seven or more consecutive

errored framing patterns)

one or more CSSs

an AIS defect

For carrier lines that use D4 and E1 framing, Bipolar Violations (BPVs) also

trigger an ES.

LCV. A Line Code Violation (LCV) occurs when a carrier line experiences

either BPVs (when using AIM) or excessive zeros (EXZ) (when using HDB3

or B8ZS). A BPV is an error in which an interface receives two pulses of the

• D4 errors:

– Framing error

– 1544+ LCVs

• Line failure + SES

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