ADC DLC1902B User Manual
ADCP-75-158 • Issue 1 • July 2003 • Section 4: Operation
Figure 4-4. Select Control Program File Window
4. Select the first file to download and click on the OK button.
5. Click on the HOST Load b utton (see Figure 4-3) to start the dow nload.
6. Repeat steps 4 and 5 for each fil e that requires downloading.
7. Repeat steps 2 through 5 for the REMOTE.
2.3 Determine Forward Path Input Signal Level
The level of the composite RF input signal at the FORWARD RF IN port at the HU will vary
depending on the type of BTS, the cable loss, the number of channels present, and the required
forward path c omposite power. If maximum composite RF output i s required, the signa l level of
the composite forward path RF signal at the HU forward path input must be adjusted to fall
within a range of –9 to –40 dBm. If the signal level is not within this range, it must be adjusted
to fall within this range thr ough the use of an external attenuator capable of handling the BTS
forward path output power.
If using the Conditioning Panel or Duplexing Pa nel, refer to the Digivance 800 and 1900 MHz
Interface Panels User Manual (ADCP-75-147) for the procedures for measuring and adjusting
the input RF signal lev el at the HU. If connec ting a single HU to a single BTS, use the follo wing
procedure to measure and adjust the input RF signal leve l at the HU:
1. Connect a spectrum analyzer or power meter to the forward path output port of the BTS.
The required signal levels and test points are shown in Figure 4-5.
Note: Check the input rating of the test equipment and the output r ating of the BTS. To
avoid burning out the spectrum analyzer or power meter, it may be necessary to insert a
30 dB 100W (or similar) attenuator bet ween the BTS and test equipment.
2. If using a spectrum analyzer, proceed to step 3. If using a power meter, measure the
composite signal po wer from the BTS and then proceed to step 5.
3. Measu re the RF level of a single ca rrier, such as the con trol channe l, in dBm. Mak e sure
the resolution bandwidth of the spectrum analyzer is 30 kHz. Maximum power in any
channel should not exce ed 5W (+37 dB).
© 2003, ADC Telecommunications, Inc.
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ADCP-75-158 • Issue 1 • July 2003 • Section 4: Operation
4. Calculate the total composite signal po wer from the BTS using the following formula:
= Pc + 10Log N – (see Note)
P
tot
Where,
is the total composite powe r in dBm
P
tot
is the power per carrier i n dBm as meas u red in s tep 3, and
P
c
N is the total number of channels.
Note: If calculating the composite power for a CDMA system, reduce the initial result by
16.23 dB.
5. Determine the total cable loss that is imposed by the forward path coaxial cable tha t links
the BTS to the HU and also any insertion loss impos ed by splitters or combiners.
6. Subtract the total cable loss and any insertion losses from the total composite power
calculated in step 4.
7. Subtract –25 (midpoint of the required range) from the value determined in step 6. The
difference (which should be positive) equals the value of the external attenuator that is
required to reduce the forward path signal level to fall within the required range. The
following formula outlines the required calculations for steps 6 and 7:
– (Cable and insertion loss) – (–25) = Value of extern al atte nuator required
P
tot
Note: If the input signal level is already within the required range of –9 to –40 dBm, then
no external atte nuator is required.
8. Select an attenuat or that is as close to the value calculate d in step 7 as possi ble. Selec t a
value that will adjust the signal level of the composite input signal to fall within the
specified range.
9. Install the external attenuator in the coaxial cable that is connected to the FORWARD RF
IN port at the HU.
Caution: The Host Unit can be damaged if it is overdriven by the BTS. Always install an
external protective attenuator at the Host Unit FORWARD RF IN port if the forward path
composite input signal level is greater than –9 dBm.
10. Subtract the value of the external attenuator used in step 9 from the total composite signal
power (P
) and record the result. This value will be required when setting the attenuation
tot
of the HU’s internal forwa rd atte nuator .
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© 2003, ADC Telecommunications, Inc.
ADCP-75-158 • Issue 1 • July 2003 • Section 4: Operation
ADJUSTMENTS TO OUTPUT
SIGNAL LEVEL AS SET BY HOST
REVERSE PATH ATTENUATOR
TRANSCEIVER STATION
RECEIVERS
HOST UNIT
0 to 31 dB
ATTENUATOR
(HOST REV ATT)
RF, OPTICS,
AND CONTROL
BASE
TRANS-
MITTERS
0 to 31 dB
ATTENUATOR
(HOST FWD ATT)
EXTERNAL
ATTENUATOR
INPUT SIGNAL LEVEL
(-25 dBm TYPICAL
COMPOSITE FOR
FULL POWER)
ADJUSTMENTS TO INPUT
SIGNAL LEVEL AS SET BY HOST
FORWARD PATH ATTENUATOR
MAXIMUM OUTPUT SIGNAL
LEVEL AT STM ANTENNA PORT
OPTICAL LINK
REMOTE UNIT
RF, OPTICS,
AND CONTROL
0 to 31 dB
ATTENUATOR
(REMOTE FWD ATT)
DUPLEXER
LPA
ADJUSTMENTS TO
OUTPUT SIGNAL LEVEL
AS SET BY THE REMOTE
FORWARD ATTENUATOR
PRIMARY
ANTENNA
17000-C
Figure 4-5. Signal Levels, Test Points, and Adjustments
© 2003, ADC Telecommunications, Inc.
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ADCP-75-158 • Issue 1 • July 2003 • Section 4: Operation
2.4 Enter Site Name and Site Number
All HU’s and RU’s are programmed with the same site name and site number. It is therefore
necessary to assign a unique site name and site number to the HU and RU before they can be
connected to the same CAN. Use the following procedure to assign a unique site name and
number to each HU and RU system:
1. Click on the HOST Config tab and on the REMOTE Config tab. The HOST Config
display and the REMOTE Config display will open within the EMS main window as
shown in Figure 4-6.
Right-Click on the
point shown to open
pop-up screen
HOST Site Number
HOST Site Name
REMOTE Site Number
(Entered automatically
when the HOST site
number is selected)
REMOTE Site Name
Figure 4-6. HOST and REMOTE Config Displays
2. Right-click on the HOST Site Name field (see Figure 4-6). The Si te Na m e pop-up screen
will open as shown in Figure 4-7. Enter a unique name for the HOST. The name may be up
to 32 characters long and must not contain any spaces. The name may include numbers,
punctuation, and upper or lower case letters and must always begin with a letter. Click on
OK to close the screen and make the changes take effect.
Page 4-10
© 2003, ADC Telecommunications, Inc.
Figure 4-7. HOST Site Name Pop-Up Screen
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