5-13 T1/T3 Analyzer Verification, Option 53 Option Verification
5-66 PN: 10580-00255 Rev. J MT8212E and MT8213E MM
T1 Transmit Level Test Verification
The tests in this section verify the transmit level of the T1 signal from the MT821xE in T1/T3 Analyzer mode.
Procedure
1. Install the LeCroy AP100 100 ohm Telecom Adapter to the Channel 1 input of the LeCroy Oscilloscope.
2. Connect the bantam to bantam cable from the Tx port on the T1 interface of the MT821xE to the input of
the LeCroy AP100 adapter on the Oscilloscope.
3. Set the MT821xE to T1/T3 Analyzer mode and preset the instrument.
4. Press the Configuration main menu key and set up the MT821xE as follows:
• Test Mode — DS1
• Line code —- B8ZS
• Tx Clock — Internal
• Tx LBO — 0dB
• Rx Input — Terminate
• Framing — ESF
• Payload Type — 1.544Mb
5. Press the Pattern/Loop main menu key, select All Ones.
6. On the LeCroy Oscilloscope, use the stylus to tap on File on the Toolbar. Select Recall Setup… and then
tap the Recall Default button to reset the Oscilloscope.
7. Press the Auto Setup key and then tap the Confirm button. Wait until the oscilloscope displays a stable
trace.
8. Tap on Measure on the Toolbar and select Std Vertical.
9. Record the displayed peak-to-peak voltage in the Tx LBO: 0 dB row of Table A-60, “Option 53,
T1 Transmitted Level Voltage” on page A-41.
10. Verify that the measured peak-to-peak voltage is between 4.8 volts and 7.6 volts.
11. Change Tx LBO to –7.5 dB on the MT821xE.
12. Record the displayed peak-to-peak voltage in the Tx LBO: –7.5 dB row of Table A-60 and verify that it is
between 1.9 volts and 3.1 volts.
13. Change Tx LBO to –15 dB on the MT821xE.
14. Record the displayed peak-to-peak voltage in the Tx LBO: –15 dB
row of Table A-60 and verify that it is
between 0.5 volts and 1.7 volts.
15. Disconnect the bantam cable from the Oscilloscope and connect it to the Rx port on the MT821xE.
16. On the MT821xE, press the Measurements main menu key and press Rx Signal.
17. Press the Start/Stop main menu key to turn measurement On.
18. Read the Vpp value from the displayed table and record it in the Tx LBO: –15 dB row of Table A-61,
“Option 53, T1 Transmitted Level Vpp Reading” on page A-41.
19. Verify that the measured Vpp value is between 0.5 volts and 1.7 volts.
20. Change Tx LBO to –7.5 dB on the MT821xE.
21. Record the displayed peak-to-peak voltage in the Tx LBO: –7.5 dB row of Table A-61 and verify that it is
between 1.9 volts and 3.1 volts.
22. Change Tx LBO to 0dB on the MT821xE.
23. Record the displayed peak-to-peak voltage in the Tx LBO: 0 dB row of Table A-61 and verify that it is
between 4.8 volts and 7.2 volts.
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