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The IMG 2020 queries the status of each individual DS-1. From the Web GUI, a user will be able to select a specific DS-1 and then monitor the information such as a spans status, number of framing errors, number of slips, and a number of other relevant information that is used when troubleshooting a network issue. The information below assumes the DS-1's have already been created and configured. 

Procedure

  • Once the T1 or E1 span is created it can then be queried. Click on the DS-1 Spans object to display the DS-1 Spans object.

  • Click on one of the individual spans in the Object Table at the bottom of the Web GUI Page and the following object will appear.

  • Within the Span Status Specification page, are monitoring fields. The monitoring fields appear as a yellow shaded field. These monitoring fields display any errors that have occurred on the DS-1 selected. To troubleshoot an issue, click on the Clear Error Statistics button and all the fields will display zero errors. By clearing the fields, an operator can troubleshoot their network by determining how many errors occurred during an interval of time as described below.

  • Open the DS-1 service state object by clicking on one of the DS-1's in the list.

  • Click on the Clear Error Statistics button and clear all the monitoring fields to zero.

  • Wait a predetermined amount of time. At the end of the predetermined amount of time, the fields will display the number of violations accumulated in a specific amount of time.

Span Name

A default Span Name is assigned to each DS-1. This name can be changed as described below: 

  • Edit the name in the Span Name field.

  • Right click on the object table and select Commit for the corresponding span.

  • Select the DS-1 Spans in the object tree and click the Update button to update the object table

Span Status Descriptions

Status

Description

Bipolar Violations

Displays the number of bipolar violations detected since the Clear Error Statistic button was last clicked on. The Bipolar Violation (BPV) indicates an error in the transmission of the signal whether it be AMI, or a modified version of AMI such as B8ZS, or Bit 7 zero suppression.

Frame Error Count

A framing error is generally the result of reading a string of symbols grouped in blocks starting at the wrong point. There may be no stop bit, start bit, incorrect number of bits, etc. The problem is usually noise on the line.

If the span is T1, this field displays the number of frame bit errors. If the span is E1, this field displays frame alignment signal errors.

Slip Count

The number of slips detected since the Clear Error Statistic button was last clicked on. Slips are usually the result of a clocking problem. Synchronizing timing with the telco provider generally will solve the issue.

Remote Alarm Indication Counter (RAI)

Displays the number of times the Remote Alarm Indication has been detected since the Clear Error Statistic button was last clicked on. Receiving a remote alarm indication indicates the far end entity has a problem with the signal it is receiving from other far end equipment it is connected to.

Loss of Frame Counter

The Number of times a Loss of Frame has been detected since the Clear Error Statistic button was last clicked on. Loss of Frame is an indication that one or more network frames did not get through the networking device. If a Loss of Frame is encountered it is likely that your network device is not correctly configured or is over subscribed.

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