ADC Telecommunications DLC1902A Digivance 1900 MHz 20 Watt System User Manual 75158

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Date Submitted	2003-08-22 00:00:00
Date Available	2003-08-22 00:00:00
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FCC ID: F8I-DLC1902A
ADCP-75-158 • Preliminary Issue A • June 2003 • Section 4: Operation
Figure 4-4. Select Control Program File Window
3. Check the software version numbers shown in the Software Info section of the Prg Load
display against the version numbers of the software files displayed in the Select Control
Program File window. If files in the Select Control Program File window are a later
version than those shown in the Prg Load display, proceed with the software download. If
the version numbers shown in the Software Info section are the same as the version
numbers of the files in the Select Control Program File window, the software download
is not required.
4. Select the required file to download and click on the OK button.
5. Click on the HOST Load button (see Figure 4-3) to start the download.
6. Repeat steps 2 through 4 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 composite power. If maximum composite RF output is required, the signal 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 through the use of an external attenuator capable of handling the BTS
forward path output power.
If using the Conditioning Panel or Duplexing Panel, 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 level at the HU. If connecting a single HU to a single BTS, use the following
procedure to measure and adjust the input RF signal level 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 rating 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 between the BTS and test equipment.
Page 4-7
© 2003, ADC Telecommunications, Inc.
ADCP-75-158 • Preliminary Issue A • June 2003 • Section 4: Operation
2. If using a spectrum analyzer, proceed to step 3. If using a power meter, measure the
composite signal power from the BTS and then proceed to step 5.
3. Measure the RF level of a single carrier, such as the control channel, in dBm. Make sure
the resolution bandwidth of the spectrum analyzer is 30 kHz. Maximum power in any
channel should not exceed 5W (+37 dB).
4. Calculate the total composite signal power from the BTS using the following formula:
Ptot = Pc + 10Log N – (see Note)
Where,
Ptot is the total composite power in dBm
Pc is the power per carrier in dBm as measured in step 3, and
N is the total number of channels.
Note: If calculating the composite power for a CDMA system, reduce the initial result by
16.23 dBm
5. Determine the total cable loss that is imposed by the forward path coaxial cable that links
the BTS to the HU and also any insertion loss imposed 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:
Ptot – (Cable and insertion loss) – (–25) = Value of external attenuator required
Note: If the input signal level is already within the required range of –9 to –40 dBm, then
no external attenuator is required.
8. Select an attenuator that is as close to the value calculated in step 7 as possible. Select 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 (Ptot) and record the result. This value will be required when setting the attenuation
of the HU’s internal forward attenuator.
Page 4-8
© 2003, ADC Telecommunications, Inc.
ADCP-75-158 • Preliminary Issue A • June 2003 • Section 4: Operation
EXTENDED BASE
TRANSCEIVER STATION
RECEIVERS
TRANSMITTERS
EXTERNAL
ATTENUATOR
INPUT SIGNAL LEVEL
(-25 dBm TYPICAL
COMPOSITE FOR
FULL POWER)
HOST UNIT
ADJUSTMENTS TO OUTPUT
SIGNAL LEVEL AS SET BY HOST
REVERSE PATH ATTENUATOR
0 to 31 dB
ATTENUATOR
(HOST REV ATT)
0 to 31 dB
ATTENUATOR
(HOST FWD ATT)
RF, OPTICS,
AND CONTROL
ADJUSTMENTS TO INPUT
SIGNAL LEVEL AS SET BY HOST
FORWARD PATH ATTENUATOR
OPTICAL LINK
REMOTE UNIT
RF, OPTICS,
AND CONTROL
0 to 31 dB
ATTENUATOR
(REMOTE FWD ATT)
LPA
ADJUSTMENTS TO
OUTPUT SIGNAL LEVEL
AS SET BY THE REMOTE
FORWARD ATTENUATOR
PRIMARY
ANTENNA
DUPLEXER
MAXIMUM OUTPUT SIGNAL
LEVEL AT STM ANTENNA PORT
17000-C
Figure 4-5. Signal Levels, Test Points, and Adjustments
Page 4-9
© 2003, ADC Telecommunications, Inc.
ADCP-75-158 • Preliminary Issue A • June 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 Site Name 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.
Figure 4-7. HOST Site Name Pop-Up Screen
Page 4-10
© 2003, ADC Telecommunications, Inc.

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Title                           : 75158.book
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