Sample Hard Loop/End-End Full E1 BERT Test

You can use this test mode to perform measurements such as BERT on an E1 circuit. This example explains how to setup a hard-loop/ene-end full E1 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 E1 circuit is not available for service when using this test mode.
 During the commissioning or startup phase of an E1 circuit, a several day end-to-end or hard loop test is often performed. This type of test provides the most comprehensive level of information, but does require that the circuit be taken out of service for the duration of the test. The test results provide more granular resolution on root cause problems than does a monitor test.
Sample Hard Loop/End-End Full E1 Test:

Step
 		Notes
1
 		[Mode]
2
 		[Backhaul]
3
 		[E1 Analyzer]
4
 		[Get Started/ Test Mode]
5
 		[Hard Loop/End-End]
 		Use this test mode to perform measurements such as BERT on an E1 circuit. The far end signal must be derived from either a hard loop or from a second test set. The E1 circuit is not available for service when using this test mode.
6
 		[Full E1 BERT]
 		Select this to perform a BERT test on a full E1 Circuit.
7
 		[Auto Config]
 		Enables the Auto Configuration buttons.
8
 		[Start Primary Auto Config]
 		Causes the test set to analyze the incoming E1 signal and align the setup choices to the properties of that signal.
9
 		[Back]
10
 		[Setup]
11
 		Setup Rx input.
  1. [Rx Input]
  2. [Terminate]
The test set must be connected to a jack that interrupts the E1 circuit.
12
 		Setup line code.
  1. [Line Code]
  2. [HDB3]
This assumes the circuit is designed for HDB3 (High Density Bipolar 3). An E1-line code in which bipolar violations are deliberately inserted if user data contains a string of 4 or more consecutive zeros.
13
 		Setup framing.
  1. [Framing]
  2. [PCM31 + CRC4]
This assumes that the circuit has been designed for PCM31 + CRC4.
14
 		Setup pattern.
  1. [Pattern]
  2. [QRSS]

15
 		Setup Tx pattern.
  1. [Tx Pattern]
  2. [Normal]

16
 		Setup Tx clock.
  1. [Tx Clock]
  2. [Internal]
This 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 E1 circuit connected to the Secondary Rx jack to establish proper timing.
17
 		Setup slip reference.
  1. [Slip Ref]
  2. [None]
Disables the frame slip measurement.
18
 		Setup second Tx.
  1. [Second Rx]
  2. [AIS]
Use the default condition.
19
 		[Display/Sound]
 		Enables the display and sound options on the buttons on the right.
20
 		Setup the status.
  1. [Status]
  2. [Pri]
Activates only the Primary Status pane. The inactive channel should be deactivated to cease the display of invalid measurements.
21
 		Setup alarms.
  1. [Alarms]
  2. [Pri]
This selection causes the Alarm pane to toggle between Primary and Secondary. Use [Pri] to observe the Primary Results in the Alarm Panel. Each time you press this softkey, the selected option changes.
22
 		Setup results display.
  1. [Results]
  2. Use up and down buttons to select.
  3. [Select]
Displays a list of results information that can be displayed in the Results pane. Make a selection based on the need of the application. [Control] enables several soft keys on the right that control choices specific to each test mode.
23
 		Setup to inject an error.
  1. [Control]
  2. [Alarm/Error]
  3. Use the Up and Down arrow buttons to select.
  4. [Select]
  5. [Inject]
Allows you to select and then inject the alarm or error you want to test. Causes the error or condition that is currently displayed on the Inject button to occur. Note that some selections cause a single event to occur while others maintain a constant state. The text on the button changes to reflect the appropriate action.



Press the [Inject] menu key to toggle between On and Off. Selecting On will inject the error selected with the [Alarm/Error] menu key during Step 23(b).