Selecting a T1 measurement mode

Step Notes
1 [Mode]  
2 [Backhaul]
  
3 [T1 Analyzer]
  
4 [Get Started/ Test Mode]
  
5 Select the desired test mode.
  
6 [Auto Config]
 Auto Configuration is not available in all test modes.
7 [Setup]
 Select this to display a list of setup choices that pertain to this test mode.
8 [RX Input]
 Configures the RX Input properties on the test set. Select Terminate, Monitor, or Bridge. The Primary and Secondary inputs are both affected by this setting.
  • Terminate sets the input impedance to 100 Ohms and should be selected when the T1 circuit is interrupted. >
  • Monitor sets the input impedance to 100 Ohms, inserts 20 dB gain and should be selected when connected to a 'Monitor' jack.
  • Bridge sets the input impedance >1000 Ohms and should be selected when bridging on to a T1 circuit.
9 [Line Code]
 Configures the test set to transmit and expect to receive a line code that is compatible with the circuit's provisioning. Select AMI or B8ZS.
10 [Framing]
 Configures the test set to transmit and expect to receive a particular framing pattern that is compatible with the circuit's provisioning. Select Unframed, D3/D4, or ESF.
11 [Pattern]
 Configures the test set to transmit and expect to receive a particular test pattern. Many test patterns are available to "stress" the circuit in a particular manner or to gain maximum insight into a particular problem.

For more information, see Patterns.
12 [TX Clock]
 Configures the test set to use one of the following methods to derive the transmit clock frequency. Select Internal, Primary RX, or Secondary RX.
13 [TX LBO]
 TX Line Build Out [TX LBO] sets the TX level and pulse shape to simulate the signal conditions that would be encountered at the end of a distant transmission cable. This is useful for testing equipment suspect of having trouble receiving signals found in typical applications.
  • 0dB LBO = 0 dBdsx = 6 Vpp
  • -7.5 dB LBO = -7.5 dBdsx = 2.53 Vpp
  • -15 dB LBO = -15 dBdsx = 1.07 Vpp
14 [Channel]
 This is applicable in only the Channel BERT mode. This sets the active channel to be tested for BERT.
15 [Fill Data]
 When performing Channel BERT testing, this configures the source of data transmitted in the unused slots. For drop-and-insert testing this field is typically set to Secondary RX. Select All 1's, Idle, Primary RX, or Secondary RX.
16 [ESF Loopback Code]
 Selects the format of the transmitted code when a loop-up or loop-down is requested.
17 [Slip Ref]
 Selects the reference for the frame slip measurement. Select None, Internal, or Second RX.
18 [Second TX]
 Selects the source of data of the signal available at the Secondary TX jack. Select AIS, Second RX, or Primary RX.
19 [Display]
 Enables the [Display] options on the right-hand buttons.
20 [Status]
 Selects the source of data of the signal available at the Secondary TX jack. Select AIS, Second RX, or Primary RX.
21 [Alarms]
 This selection causes the Alarm pane to toggle between Primary and Secondary.
22 [Results]
 Enables a list of results information that can be displayed in the Results pane. Make a selection based on the need of the application.
23 [Control]
 The selection enables several right-hand soft keys that control choices specific to each test mode.
24 [Pattern]
 Allows fast access to pattern selection. See Patterns.
25 [Alarm/Error]
 Enables a list of available alarms and conditions that can be transmitted on the Primary TX channel. The alarm or condition is invoked by pressing the Inject button. Select Loss of Signal Alarm, Loss of Frame Alarm, Yellow Alarm, AIS Alarm, Idle Alarm, BPV Error, or Frame Error. The test set forces a CRC error with each press of the Inject button. Note that this is possible when only the ESF mode is selected. The test set forces an error in the transmitted patter with each press of the Inject button.
26 [Inject]
 Causes the error or condition that is currently displayed on the 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.
27 [Send Loop Up]
 Sends a loop up command to the far-end and reports the loop state on the status line. If a pre-existing loop is detected at the far end then "Pre-existing loop" is displayed on the status line. (Only possible in In-band loop mode)
28 [Send Loop Down]
 Sends a loop down command to the far end and reports the loop state on the status line. (Only possible in In-band loop mode)