ZXG10 BS21 (V2.2) Compact Outdoor BTS for GSM Maintenance Manual
72
Confidential and Proprietary Information of ZTE CORPORATION
After the DAC value has been specified, the system calculates the
corresponding voltage automatically. Press the “Calibrate” button to
inform the foreground to start calibration. Observe the cymometer to
see whether the clock is adjusted to 13 M.
7.
Press “Save” button to save DAC value in FLASH; the system adopts
the value saved in FLASH at reboot. If new DAC value is not saved in
time, the system still uses the old DAV value saved in FLASH at reboot.
8.
Press “End” to terminate the calibration procedure.
[
Normal result
]
The clock can be calibrated to 13.000000 MHz ± 0.025 ppm.
[
Troubleshooting
]
Replace CMM module if it is impossible to calibrate clock to above range.
[
Recovery after test
]
Reset the base station to its original mode if it works at the external
synchronization mode previously.
Checking Fastness of Antennae and
Towers
[
Instruments and meters
]
A spanner.
[
Test procedure
]
1.
Check whether the fixing clips for securing the antennae and the
antenna supports are fixed.
2.
Check whether the fixing clips of the tower amplifier are secured.
[
Normal result
]
The antennae and tower amplifiers are secured. They do not move or slide.
[
Troubleshooting
]
Tighten the fastening screws by using a spanner.
[
Recovery after test
]
None.
Checking Obliquity of Directional
Antennae
[
Instruments and meters
]
