User Manual

AS4000 Release3 and Release 4 Central
Terminal Installation and Commissioning
DLP-015
605-0000-432
Issue 1.3a Date 18th October 1999
Page 4 of 8
• Ensure that at the end of the programming sequence, the “code accepted” tone
is heard in the handset receiver, which consists of 1400 Hz pulses for 1 sec on;
1 sec off, for a duration of 5 sec. Replace the telephone handset.
• Depress the reset switch, (Type2 SW4 Type 4 SW2); The CRU will reset and
re-boot itself in accordance with the programming code entered.
c) Switch rack off by placing both breakers in the off position.
d) Disconnect terminations on DIP/LNA1 and TX filter.
e) Connect the cables and accessories to the CT rack for Modem Shelf setting up and
functionality testing as detailed in Figure 37. Set the 0-11dB variable attenuator to
a nominal 8dB (the insertion loss of the test circuit should be 109dB between point
A and B in Figure 37. In practice the setting of the attenuator will be a few dBs
less than the 8dB to account for the actual cable, connector and splitter loss. Due to
the microwave frequencies involved the commissioning items need to be calibrated
for the channel frequencies to be used.
Note: If the TX Filter is not fitted for shelves 3&4 terminate the port of Splitter 1 as
shown in Figure 37
f) Switch the power back on at the breakers.
Power
Meter
ST
Test
Unit
(C Band)
CT Rack
3
1 2
30dB
30dB
30dB 30dB
2:1
Splitter
2:1
Splitter
2:1
Splitter
SMA-N
RF Sensor
N-SMA
11dB
Variable *
* Set variable attenuator to give an insertion loss of 109dB
between points A and B (nominal value of 8dB)
DIP/LNA TX Filter
RX
TX
NTU
NTU
ACPSU
A
B
If TX Filter not fitted
Terminate port here
Adapter
Female to
Female
C
Figure 37. Test Set-Up Modem Shelves (2.0-2.3GHz Band)
a) Connect the cables and termination’s to the Test CRU as shown in Figure 38.
b) Connect the drop cable of the CRU and the telephony VF pairs to the AC PSU.