Option Verification 5-13 T1/T3 Analyzer Verification, Option 53
MT8212E and MT8213E MM PN: 10580-00255 Rev. J 5-67
T3 Clock Frequency Test Verification
This test will verify that the internal signal is being clocked at the correct frequency and verify that the clock
recovery circuit can generate the correct frequency.
Procedure
1. Connect the External 10 MHz Reference Signal to the rear panel of the MP1570A.
2. On the MT821xE, confirm that the mode is set to T1/T3 Analyzer. Preset the instrument.
3. Press the Configuration main menu key, highlight Tes t M o de , and press the DS3 soft key.
4. Set Tx Clock to Internal.
5. Set Tx LBO to DSX.
6. Press the Pattern/Loop main menu key and then select the All Ones pattern.
7. Set up the MP1570A as follows:
• Set Mapping to Tx&Rx
• Set Config. to SDH/PDH
• Set Meas. Mode to Out_of_service
• Set Bit Rate to 45M
• Set MUX/DEMUX to OFF (not present on all units)
• Set Frame to ON
• Set 45M Framed to C-bit
• Set X-Bit to 11
• Set DSX to 0 ft
• Set Clock to internal
• Set Monitor Mode to OFF
8. Change to the other Setup display and set the Test Pattern to All 1.
9. Set Analyze to Freq Monitor.
10. Using a 75 ohm BNC cable (part number 3-806-169), connect the MT821xE Tx connector to the MP1570A
B3ZS Input (on the MP0122xB module).
11. Using a second 75 ohm BNC cable, connect the MT821xE Rx connector to the MP1570A B3ZS Output
(on the MP0122xB module).
12. Allow the status bar on the bottom of the display to complete at least one sweep.
13. View the ppm error that is shown on the MP1570A and record it in the Internal Clock Error row of
Table A-62, “Option 53, T3 Frequency Clock” on page A-41.
14. On the MT821xE, change the Tx Clock
setting to Recovered.
15. Press the Measurements main menu key, and activate Rx Signal (red dot appears on label).
16. Press the Start/Stop main menu key to turn the measurement On (“Measure ON” appears in the
lower-left corner of the display).
17. Record the Frequency reading (center of display) in the Recovered Clock Frequency row in
Table A-62.
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