Cisco MGX 8240 User Manual

OC3 Statistics

CHAPTER

5

Statistics

This chapter provides an overview of available statistics for troubleshooting the MGX 8240 switch.

Each OC3 performance monitoring statistic is retained for the current 15-minute interval, a history of
the last 32 15-minute intervals (8 hours), the current 24-hour period (starting and ending at midnight
GMT), and the previous 24-hour period. Along with statistics, it is also possible to verify the elapsed
time in the current 15-minute interval and the amount of 15-minute intervals currently stored (this is
relevant only during the first 8 hours of operation). The following statistics are retained:

• Section Errored Seconds

• Section Severely Errored Seconds

• Section Severely Errored Framing Seconds

• Section Coding Violations

• Line Errored Seconds

• Line Severely Errored Seconds

• Line Coding Violations

• Line Unavailable Seconds

• Line Alarm Indication Signal Seconds

• Far End Line Errored Seconds

• Far End Line Severely Errored Seconds

• Far End Line Coding Violations

• Far End Line Unavailable Seconds

• Path Errored Seconds

• Path Severely Errored Seconds

• Path Coding Violations

• Path Unavailable Seconds

• Path Alarm Indication Signal Seconds

• Far End Path Errored Seconds

• Far End Path Severely Errored Seconds

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DS3 Statistics

Chapter 5 Statistics

• Far End Path Coding Violations

• Far End Path Unavailable Seconds

Each DS3 performance monitoring statistic is retained for the current 15-minute interval, a history of the
last 32 15-minute intervals (8 hours), and the current 24-hour period (starting and ending at midnight
GMT). Along with the statistics, it is also possible to verify the elapsed time in the current 15-minute
interval and the amount of 15-minute intervals currently stored (this is relevant only during the first
8 hours of operation). The following statistics are retained:

• P-bit Errored Seconds

• P-bit Severely Errored Seconds

• P-bit Coding Violations

• Severely Errored Framing Seconds

• Line Errored

• Line Severely Errored Seconds

• Line Coding Violations

• Unavailable Seconds

• Alarm Indication Signal Seconds

• C-bit Errored Seconds (applies only to C-bit Parity line type)

• C-bit Severely Errored Seconds (applies only to C-bit Parity line type)

• C-bit Coding Violations (applies only to C-bit Parity line type)

• Far End C-bit Errored Seconds (applies only to C-bit Parity line type)

• Far End C-bit Severely Errored (applies only to C-bit Parity line type)

• Far End C-bit Coding Violations (applies only to C-bit Parity line type)

• Far End Unavailable Seconds (applies only to C-bit Parity line type)

DS1 Statistics

Note Line Errored Seconds, Line Severely Errored Seconds, and Line Coding Violationsare not

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supported directly on the MGX 8240 because the MGX 8240 does not terminate the DS1
line. This means that no performance monitoring statistics can be supported when the DS1
is not set for ESF or SF framing. Since the only means of monitoring far end performance
statistics is through the ESF Facilities Data Link, far end statistics can only be supported
when ESF framing is selected.

The following statistics are retained:

• Errored Seconds (applies only to ESF and SF framing types)

• Severely Errored Seconds (applies only to ESF and SF framing types)

• Severely Errored Framing (applies only to ESF and SF framing types)

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Chapter 5 Statistics

• Unavailable Seconds (applies only to ESF and SF framing types)

• Path Coding Violations (applies only to ESF and SF framing types)

• Alarm Indication Signal Seconds (applies only to ESF and SF framing types)

• Far End Errored Seconds (applies only to ESF framing type)

• Far End Severely Errored Seconds (applies only to ESF framing type)

• Far End Severely Errored Framing Seconds (applies only to ESF framing type)

• Far End Path Coding (applies only to ESF framing type)

• Far End Line Errored Seconds (applies only to ESF framing type)

• Far End Unavailable Seconds (applies only to ESF framing type)

• Out-of-Frame

Protocol Layer Statistics

This protocol layer statistics for the MGX 8240 are described below.

Protocol Layer Statistics

ATM

Each ATM logical port statistic is kept for the current 15-minute interval, a history of the last two
15-minute intervals (30 minutes), and the current 24-hour period (starting and ending at midnight GMT).
The ATM statistics are as follows:

• Valid Cells Ingress

• Cells Ingress discarded due to HEC Errors

• Cells Egress

Circuit Emulation Service

Circuit Emulation Service (CES) connection statistics are kept for the current 15-minute interval, a
history of the last 96 15-minute intervals (24 hours), the current and previous 24-hour period (starting
and ending at midnight GMT).

• Cells Reassembled—Number of incoming cells that were played out to the CES Service interface.

It excludes cells that were discarded for any reason, such as cells that were not used due to being
declared misinserted, or discarded while the reassembler was waiting to achieve synchronization.

• Cells with Header Errors—Cells received with AAL1 header errors detected, including those

corrected. This includes cells with both correctable and uncorrectable CRC, as well as bad parity in
the Sequence Number Protection field of the AAL1 header.

• Pointer Reframes—Number of events in which the AAL1 reassembler found that an SDT pointer is

not where it is expected, and the pointer must be reacquired. This count is only meaningful for
structured CES modules, as Unstructured CES modules do not use pointers. For Unstructured CES
connections, this count is zero. If this occurs, any received cells are dropped until the reassembly
underflows. Sequence number synchronization and valid pointer is then searched for. When sync is
reached, cells are buffered until the configured Cell Delay VariationTolerance buffer is filled.Once
filled, the buffered data is played out the CES service interface.

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