Specifications

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VPN 3000 Series Concentrator Reference Volume II: Administration and Monitoring
78-13274-01
Chapter 13 System Status
Monitoring | System Status | Dual T1/E1 WAN Slot N
Severely Errored Framing Seconds
The number of seconds during which one or more out-of-frame defects or an AIS defect were detected
on this port.
Unavailable Seconds
The number of seconds during which this port has not been available. Basically, unavailable seconds
begin with 10 contiguous severely errored seconds, or with a condition leading to failure.
Line Errored Seconds
The number of seconds during which one or more line coding violations were detected on this port.
Degraded Minutes
The number of minutes during which lower than normal-quality signals were detected on this port. (The
estimated error rate >1e
-6
but <1e
-3
.)
Bipolar Violations
The number of bipolar violations detected on this port, defined as:
• AMI-coded signal: a pulse of the same polarity follows the previous pulse.
• B8ZS- or HDB3-coded signal: a pulse of the same polarity follows the previous pulse but is not a
part of the zero substitution code.
Line Coding Violations
The number of line coding violations detected on this port, which are bipolar violations or excessive
zeros violations (for AMI, >15 contiguous zeros; for B8ZS, >7 contiguous zeros).
Path Coding Violations
The number of path coding violations detected on this port, defined as:
• SF/D4 and E1 (no CRC) signals: a frame synchronization bit error.
• ESF and E1/CRC4 signals: a CRC error.
Controlled Slips
The number of times that the payload bits of a frame were replicated or deleted on this port. This
condition occurs when there is a difference between the timing (synchronization) of the receiving port
and the received signal.