Sample Hard Loop/End-End Full T1 BERT Test

Use this test mode to perform measurements, such as BERT, on a known test pattern being sent from the far end. The far end signal can be generated by looping back the transmitted signal from this test set or by a second test set. To use this test, have someone at the far end manually loop-up the equipment or generate a known pattern with a far end test set. Since a pattern is being sent on the T1 line, service on the T1 will be affected.
This example explains how to setup a hard-loop/end-end full T1 BERT test. A hard loop test requires one test set at one end and a hard loop at the other. An end-end test requires a test set at each end but enables the troubleshooter to identify the direction of the trouble. The T1 circuit is not available for service when using this test mode.
 During the commissioning or startup phase of a T1 circuit, a several day end-end or hard loop test is often performed. This type of test provides the most comprehensive level of information but does require the circuit to be taken out-of-service for the duration of the test. The test results provide more granular resolution on root cause problems than a monitor test.
To Preform a Hard Loop/End-End Full T1 BERT Test

Step
 		Notes
1
 		Connect the BSTS to the DSX panel
 		Refer to the Measurement Guide
2
 		[Mode]
3
 		[Backhaul]
4
 		[T1 Analyzer]
5
 		Select a test mode.
  1. [Get Started/ Test Mode]
  2. [Hard Loop/End-End]
  3. [Full T1 BERT]
Use this test mode to perform measurements such as BERT on a T1 circuit. The far end signal must be derived from either a hard loop or from a second test set. The T1 circuit is not available for service when using this test mode.
 Select this to perform a BERT test on a full T1 Circuit.
6
 		Setup auto configuration.
  1. [Auto Config]
  2. [Start Primary Auto Config]
Enables the Auto Configuration buttons and causes the test set to analyze the incoming T1 signal and align the setup choices to the properties of that signal.
7
 		[Back]
 		Shifts focus back to the main mode selection buttons.
8
 		[Setup]
 		Select this to display a list of setup choices that pertain to this test mode.
9
 		Setup the Rx input.
  1. [Rx Input]
  2. [Terminate]
This assumes the test set is connected into a jack that interrupts the T1 circuit.
10
 		Setup the line code.
  1. [Line Code]
  2. [B8ZS]
This assumes the circuit is designed for B8ZS (Bipolar 8 Zero Substitution). A T-carrier line code in which bipolar violations are deliberately inserted if user data contains a string of 8 or more consecutive zeros.
11
 		Setup the framing.
  1. [Framing]
  2. [ESF]
This assumes that the circuit has been designed for ESF. Extended Superframe Format utilizes the framing bit capacity for additional purposes. The number of frames per multiframe is expanded to 24 frames.
12
 		Setup the pattern.
  1. [Pattern]
  2. Use up and down buttons to select.
  3. [QRSS]
  4. [Select]

13
 		Setup the Tx clock.
  1. [Tx Clock]
  2. [Internal]
Internal is the default selection after test set preset and covers the situation when a hard loop is configured at the far end. If a separate test set is used at each end, then the test set on one end should have the TX Clock set to Primary Rx (assuming the incoming signal is connected to this jack). Another alternative is to use a second T1 circuit connected to the Secondary Rx jack to establish proper timing.
14
 		Setup the Tx LBO.
  1. [Tx LBO]
  2. [0 dB]
This is a typical level found at the customer demarcation point.
15
 		Setup the slip reference.
  1. [Slip Ref]
  2. [None]
Disables the frame slip measurement.
16
 		Setup the second Tx.
  1. [Second Tx]
  2. [AIS]
Use the default condition.
17
 		Setup the display.
  1. [Display]
  2. [Status]
  3. [Pri]
Enables the [Display] options on the buttons on the right.
 Activates only the Primary Status pane. The inactive channel should be deactivated to cease the display of invalid measurements.
18
 		Setup alarms.
  1. [Alarms]
  2. [Pri]
Use this selection to observe the Primary Results in the Alarm Panel.
19
 		Setup the results display.
  1. [Results]
  2. Use up and down buttons to select.
  3. [Select]
Enables a list of results information that can be displayed in the Results pane. Make a selection based on the need of the application.
20
 		Setup the results display.
  1. [Results]
  2. Use the up and down arrows to select.
  3. Make a selection.
  4. [Select]
Enables a list of results information that can be displayed in the Results pane. Make a selection based on the need of the application.
21
 		Setup the controls and select a pattern.
  1. [Control]
  2. [Pattern]
  3. Use the up and down buttons to select.
  4. QRSS
  5. [Select]

22
 		Select the alarm.
  1. [Alarm/Error]
  2. Use the up and down buttons to select.
  3. Loss of Signal
  4. [Select]

23
 		Inject an error.
  1. [Inject]
  2. [On]
Causes the error or condition that is currently displayed on the button to occur.