Option Verification 5-11 T1 Analyzer Verification, Option 51
MT8212E and MT8213E MM PN: 10580-00255 Rev. J 5-57
8. On the MT821xE, press the Configuration main menu key near the bottom-left corner of the display and
verify that Tx Clock is set to Internal, Line Code is set to B8ZS, and Framing is set to ESF. Then set
Tx LBO to 0dB and Pattern to PRBS-15.
9. The MT821xE T1 frequency and ppm error appear on the MP1570A. Record the ppm error value in the
Internal Clock Error row of Table A-53, “Option 51, T1 Frequency Clock” on page A-39.
10. On the MP1570A, change Pattern to All One.
11. On the MT821xE, press the Configuration main menu key.
12. Use the rotary knob to select Tx Clock, and set Tx Clock to Recovered.
13. Press the Measurements main menu key and then press Rx Signal.
14. Press the Start/Stop main menu key so that “Measure On” is displayed.
15. Record the Frequency value on the MT821xE into the Recovered Clock Frequency row of Table A-53.
T1 Transmit Level Test Verification
The tests in this section verify the transmit level of the T1 signal from the MT821xE in T1 Analyzer mode.
Procedure
1. Install the LeCroy AP100 100 ohm Telecom Adapter to Channel 1 input of 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 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
• Receive Input — Terminate
• Framing — ESF
• Payload Type — 1.544Mb
• Tx LBO — 0dB
5. Press the Pattern/Loop main menu key and select All Ones, then press the Select Pattern submenu key.
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-54, “T1 Transmitted
Level Voltage” on page A-39.
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-54 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-54 and verify that it is
between 0.5 volts and 1.7 volts.
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