Specifications

Chapter 6 Diagnostics and Troubleshooting Installation and Operation Manual
6-2 Monitoring Performance MiTOP-E1/T1 Ver. 1.0
Table 6-1. TDM Statistics Parameters
Parameter Description
ES Number of Errored Seconds. For ESF and E1-CRC links an Errored Second is a second with
one of the following events:
• One or more Path Code Violations
• One or more Out of Frame defects
• One or more Controlled Slip events
• AIS defect.
For D4 and E1 without CRC links, the presence of Bipolar Violations also triggers an Errored
Second event. This is not incremented during an Unavailable Second.
SES Number of Severely Errored Seconds. For ESF links a SES is a second with one of the
following events:
• 320 or more Path Code Violation Error Events
• One or more Out of Frame defects
• AIS defect.
For E1-CRC signals, a SES is a second with one of the following events:
• 832 or more Path Code Violation error events
• One or more Out of Frame defects.
For E1 without CRC, a SES is a second with 2048 LCVs or more.
For D4 signals, a Severely Errored Second is a count of one-second intervals with one of the
following:
• Framing Error event
• OOF defect
• 1544 or more LCVs.
Controlled slips are not included in this parameter. This is not incremented during an
Unavailable Second.
UAS Number of Unavailable Seconds. Unavailable Seconds (UAS) are calculated by counting the
number of seconds when the interface is unavailable. The interface is unavailable from the
onset of 10 contiguous SESs, or the onset of the condition leading to a failure.
BES Number of Bursty Errored Seconds. A BES is a second with fewer than 320 and more than 1
Path Coding Violation error events, without Severely Errored Frame defects and no detected
incoming AIS defects. Controlled slips are not included in this parameter. This is not
incremented during an Unavailable Second.
Displaying the Ethernet Statistics
The Ethernet performance monitoring data is collected at the physical level.
³ To display the Ethernet statistics:
1. From the Physical Layer menu (Monitoring > Physical Layer), select Ethernet
Statistics:
The Ethernet Statistics screen is displayed.
2. Click Refresh to refresh the screen.