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Chapter 5. Statistics

Line Unavailable Seconds (LUAS)

Time in seconds that the Line layer has been unavailable for data delivery.

Path Unavailable Seconds (PUAS)

Time in seconds that the Path layer has been unavailable for data delivery.

Clear All Local STS-1Statistics

Clears all current information. This selection affects all statistical information (not just the displayed screen). When viewing the 24-hourhistory screen, press the down arrow key to access this selection.

LOCAL VT STATISTICS

This menu provides submenus for alarm history and performance parameters (see Figure 5-8).

Figure 5-8.Local VT Statistics

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Alarm History

The MX2800 STS-1keeps track of alarms for both the near and far ends of the network. View alarm history information in one of the three time period selections, or view a cumulative alarm count.

Information in these fields is for the given time period since the last reset. The cumulative alarm count continues indefinitely until CLEAR ALL VT ALARM COUNTS is selected. SeeFigure 5-9andFigure 5-10 on page 5-12 for examples of alarm screens.

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The following alarm counts are provided in this menu:

Condition

Description

 

 

LOP

The number of times the unit has failed to find a

 

valid VT pointer.

 

 

AIS

The number of times the unit has received a path

 

alarm indication signal. VT-PathAIS is defined as

 

all ones in bytes V1, V2, V3, and V4 as well as all

 

ones in the entire VT synchronous payload

 

envelope. A VT-PathAIS failure is declared when

 

the VT-PathAIS defect persists for 2.5 +/- 0.5

 

seconds.

 

 

RDI

Number of times the unit has received a VT path

 

remote defect indication. VT-RFIis declared

 

when the incoming VT path RDI lasts for 2.5 +/-

 

0.5 seconds.

 

 

RFI

Number of times the unit has received a VT path

 

remote failure indication. VT-RFIis declared

 

when the incoming VT path RFI lasts for 2.5 +/-

 

0.5 seconds.

 

 

SLM

Number of times the unit has detected a SLM

 

alarm condition from the VT path. A received

 

signal label is mismatched if it does not equal the

 

locally provisioned value or the value “equipped

 

non-specific”.

 

 

UEQ

Number of times the unit has detected a UEQ

 

alarm condition from the VT path. The VT path is

 

not provisioned. Byte V5 of the STS path

 

overhead is set to zero.

 

 

The count given reflects the number of times the alarm or state has occurred (rather than the number of seconds the alarm was active).

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Figure 5-9.LocalVT-LOPAlarm Count Screen (Current 15 Minutes)

Figure 5-10.LocalVT-LOPAlarm Count Screen (24 Hour History)

Performance Parameters

View performance parameter information for the network in one of the three time period selections. Information in these fields is for the given time period since the last reset. When viewing the 24-hourhistory statistics screen, use the left and right arrow keys to scroll through all 9615-minuteintervals. SeeFigure 5-11 and

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Figure 5-12 on page 5-14 for examples of the VT performance parameter screens.

Condition

Description

 

 

CV

(Coding Violation)

 

The number of coding violations encountered at

 

the VT layer.

 

 

ES

(Errored Seconds)

 

Number of seconds with one or more coding

 

violations or one or more incoming defects (e.g.,

 

AIS, LOP) at the VT layer.

 

 

SES

(Severely Errored Seconds)

 

Number of seconds with X or more coding

 

violations are the VT layer, or a second during

 

which at least one or more incoming defects at the

 

VT layer has occurred. Values of X vary

 

depending on the line rate and the Bit Error Rate.

 

 

UAS

(Unavailable Seconds)

 

Time in seconds that the VT layer has been

 

unavailable for data delivery.

 

 

The count given reflects the number of times the alarm or state has occurred (rather than the number of seconds the alarm was active).

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Figure 5-11.LocalVT-CVPerformance Parameters (Current 15 Minutes)

Figure 5-12.LocalVT-CVPerformance Parameters (24 Hour History)

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LOCAL PORT STATISTICS

The MX2800 STS-1keeps track ofLOSS OF SIGNAL ALARMS,

BIPOLARVIOLATIONCOUNTS, AIS LOOPALARMS, and AIS CARRIER

ALARMS for each of the Ports (T1s/E1s) (seeFigure 5-13).View this information in one of the three time period selections, or view a cumulative alarm count. Information in these fields is for the given time period (if any) since the last reset. The cumulative alarm count continues indefinitely untilCLEAR ALL PORT ALARM COUNTS (located in each field) is selected.

Figure 5-13.Local Port Statistics Menu

Loss of Signal Alarms

The number of times the unit has lost the receive signal on a T1/E1.

Bipolar Violation Counts

The number of times the unit has received a bipolar violation.

AIS Loop Alarms

The number of times the T1 has received all ones from the DSX-1interface.

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AIS Carrier Alarms

The number of times the T1 has received all ones from the STS side of the network.

FAR END STS-1STATISTICS

This menu provides a submenu performance parameters (see Figure 5-14).

Figure 5-14.Far EndSTS-1Statistics Menu

Performance Parameters

View performance parameter information for the network in one of the three time period selections. Information in these fields is for the given time period since the last reset. When viewing the 24-hourhistory statistics screen, use the left and right arrow keys to scroll through all 9615-minuteintervals. SeeFigure 5-15 andFigure 5-16 on page 5-17, andFigure 5-17 on page 5-18 for examples of the performance parameter screens.

Descriptions of the individual performance parameters fields follow the screens.

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Figure 5-15.Far EndSTS-1Performance Parameters (Current 15 Minutes)

Figure 5-16.Far EndSTS-1Performance Parameters (24 Hour History)

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Figure 5-17.Far EndSTS-1Performance Parameters (24 Hour Totals) Interval starting at:

Time that the 15-minuteinterval began. This field is displayed only in the24-hourhistory screen which gives information for the previous 24 hours divided into15-minuteintervals (shown inFigure 5-6 on page 5-6).

Severely Errored Framing Seconds (SEFS)

Number of seconds that contain one or more SEF events. This counter is only counted at the Section layer.

Section Coding Violations (SCV)

Number of coding violations encountered at the Section layer.

Line Coding Violations (LCV)

Number of coding violations encountered at the Line layer.

Path Coding Violations (PCV)

Number of coding violations encountered at the Path layer.

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