Printed Documentation
124
Test Set-up
2. Measure and calibrate the loss of all components as per diagram above:
3. Measure (1)A-B, (2)B-C, (3)C-D and (7)D-E.
4. Enter values in calibration chart for the relevant frequency.
5. Calculate/determine overall path loss and required ST output power and hence
required power meter reading.
6. Connect cables as per diagram above.
7. Ensure that the commissioning button is off. This resets the DTU card, reactivates
RW14&15 for link acquisition, and sets all RWs in service
8. Create ST on AC ST list
9. Configure test ST using AS7020STMON according to modem shelf properties to the
correct frequency, PN code and ID number.
10.
Allow test ST to acquire link and Net Enter to “warm” state
11. From ST properties, set loopback mode to enable 160k high rate operation
12. Measure ST TX o/p level
13. On Modem Shelf Properties, set RX gain to achieve required ST o/p level as
calculated in step 4 for
–
98dBm receiver sensitivity
Note:
To start with, set the RX gain to around 2200 and click right mouse
button at the side of the RX Gain Box to increase and decrease reading at the
power meter. Check the output power of the ST, and repeat until the output
power reaches the required level
14. Record results in test results sheet
Summary of Contents for AS4000
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Page 42: ...Printed Documentation 38 BNC Terminations to Coax ...
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Page 78: ...Printed Documentation 74 Card Insertion DA Rack Card Insertion Expansion Rack ...
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