Out‑of‑service measurements are performed when the T3 circuit is not in-service or is inactive. Typically, these tests are done during initial installation, during circuit acceptance by the wireless service provider, or when the results of the in‑service measurements indicate significant errors. These measurements provide detailed information about the T3 circuit.
Out‑of‑service testing is performed using end‑to‑end testing, which requires a technician and a T3 tester at each end of the circuit, or it is performed by establishing a loopback at the remote end of the circuit.
The following measurements check the T3 performance during out‑of‑service testing:
• Vpp
• Carrier Frequency
• Frame Sync
• Pattern Sync
• P‑bits
• C‑bits
• FEBE
• Insert Errors/Alarms
• BER
Required Equipment
• BNC Cables, Anritsu Part Number 3‑806‑169
BERT Measurement Setup Procedure
1. In the T1/T3 Analyzer mode, press the Configuration main menu key.
2. Use the Up/Down arrow keys or the rotary knob to highlight Line Code and press the B3ZS or the AMI coding submenu key.
3. Use the Up/Down arrow keys or the rotary knob to highlight Tx Clock and select Internal or Recovered.
4. Use the Up/Down arrow keys or the rotary knob to highlight Tx LBO and select either Low or DSX.
5. Use the Up/Down arrow keys or the rotary knob to highlight Rx Input and select DSX3.
6. Use the Up/Down arrow keys or the rotary knob to highlight Framing and select M13, C‑Bit, or Unframed.
The remaining steps of this procedure (7. through 15.) apply only when using M13 or C‑bit framing and testing at T3 subrates.
7. Use the Up/Down arrow keys or the rotary knob to highlight Payload Type and select from 45Mb, 1.544Mb, Nx64kb, 64kb, 56kb, 16kb, or 8kb (framed modes only).
8. Use the Up/Down arrow keys or the rotary knob to highlight Payload DS1 Channel. Selections depend upon the payload type and are available only with Nx64kb, 64kb, 56kb, 16kb, or 8kb. Select one of the 28 DS1 channels. Press the Edit Channel submenu key and select the channel from the list by using the Up/Down arrow keys or the rotary knob. Press Select Channel and press Enter to select the channel number in the edit box.
9. Use the Up/Down arrow keys or the rotary knob to highlight Payload DS0 Channel. Selections depend upon the payload type and are available only with Nx64kb, 64kb, 56kb, 16kb, or 8kb. Press the Edit Channel submenu key and select the channel from the list using the Up/Down channel or the rotary knob. Press Enter to select the channel number in the edit box.
10. Use the Up/Down arrow keys or the rotary knob to highlight Payload Frame and select either ESF or SF–D4.
11. Use the Up/Down arrow keys or the rotary knob to highlight Other Channels and select All Ones, Broadcast, or AIS.
12. Press the Pattern/Loop main menu key to activate the Pattern/Loop menu.
13. Use the Up/Down arrow keys or the rotary knob to highlight the appropriate pattern, and then press the Select Pattern submenu key or the Enter key.
14. Connect the instrument Rx BNC jack to the circuit Tx jack, and the instrument Tx BNC jack to the circuit Rx jack.
15. If a test set is not connected to the far end, then set up a loopback.
Basic BERT Measurement Procedure
1. Press the Measurements main menu key to activate the Measurements menu.
2. Press the BERT submenu key to activate the BERT menu.
3. Press either the DS1 Table or the DS3 Table submenu key to display the measurements in the table format, or press Histogram or Event List.
4. From the BERT menu, press the Back submenu key. Then from the Measurements menu, press the Measure Time submenu key and use the Up/Down arrow keys, rotary knob, or key pad to enter the duration of the measurement. Then press Enter.
5. Press the Start/Stop main menu key to start and stop the measurement.
Note
The measurement time is set in the Measure Time menu (1 min, 3 min, 5 min, 15 min, 30 min, 1 hour, 2 hours, 3 hours, 1 day, 2 days, 3 days, or Manual). Manual runs indefinitely and allows the user to terminate the measurement at any time.