Specifications

Installation and Operation Manual Chapter 6 Troubleshooting and Diagnostics
RICi-622GE Ver. 1.0 Monitoring Performance 6-11
Table 6-3. SDH/SONET Statistic Counters
Term Meaning
ES Number of seconds during which one or more of the following faults
occurred:
• Severely Errored Frame (SEF) (also called Out of Frame (OOF) ): A SEF
defect is declared after detection of four contiguous errored frame
alignment words. The SEF defect is terminated when two contiguous
error free frame words are detected.
• Loss of Signal (LOS) defect: A LOS defect is declared after when no
transitions are detected in the incoming line signal (before
descrambling) during an interval of 2.3 to 100 microseconds. The LOS
defect is terminated after a 125 microsecond interval (one frame)
during which no LOS defect is detected.
• Loss of Pointer (LOP) defect: A LOP defect is declared after no valid
pointer is detected in eight consecutive frames. The LOP defect will not
be reported while an AIS signal is present. The LOP defect is terminated
after a valid pointer is detected.
• Alarm Indication Signal (AIS) received in the SDH/SONET overhead.
SES Number of severely errored seconds (SES) in the current interval. A second
is considered to be a severely errored second if multiple error events of the
types described for ES occurred.
UAS(SEFS) Number of unavailable seconds (UAS(SEFS)) in the current interval. An
unavailable second is any second in which one or more SEF defects were
detected
CV Number of Coding Violations (CV) in the current interval: a coding violation
is declared when a Bit Interleaved Parity (BIP) error is detected in the
incoming signal. The BIP information is collected using the B1 byte in the
Section Overhead.
Viewing Logical Layer Statistics
RICi-622GE allows you to display logical layer performance statistics.
³ To display Logical Layer Statistics:
1. From the Monitoring Logical Layer menu (Monitoring > Logical Layer), select
Statistics to show the logical layer statistics menu.
2. From the logical layer statistics menu, select the interval for which you wish
to see statistics.
Table 6-4 describes the logical layer statistic counters.