User's Manual

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ADCP-75-158 • Issue 1 • July 2003 • Section 4: Operation

Page 4-7

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 button (see Figure 4-3) to start the download.

6. Repeat steps 4 and 5 for each file 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 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.

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).

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.

Summary of content (11 pages)

PAGE 1
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 button (see Figure 4-3) to start the download. 6. Repeat steps 4 and 5 for each file that requires downloading. 7. Repeat steps 2 through 5 for the REMOTE. 2.
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ADCP-75-158 • Issue 1 • July 2003 • Section 4: Operation 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 dB. 5.
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ADCP-75-158 • Issue 1 • July 2003 • Section 4: Operation 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
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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.
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ADCP-75-158 • Issue 1 • July 2003 • Section 4: Operation 3. Right-click on the HOST Site Number (see Figure 4-6). The Site Number pop-up screen will open. Enter any number between 1 and 24 and then click on OK to close the screen and make the changes take effect. 4. Check the REMOTE Site Number field (see Figure 4-6). The REMOTE Site Number does not have to be entered. When the HOST Site Number is entered, the system will automatically enter the same number for the REMOTE Site Number. 5.
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ADCP-75-158 • Issue 1 • July 2003 • Section 4: Operation Right-click here to open Host Fwd Att pop-up screen Figure 4-8. HOST RF Display Figure 4-9. Host Fwd Att Pop-Up Screen 2.6 Determine Output Signal Level at STM Antenna Port The RF output signal level should be measured at the STM ANTENNA port to verify that maximum composite signal level is at the required level. Use the following procedure to determine the power level: 1. Verify that RF ON/OFF switch on the LPA in the OFF position. 2.
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ADCP-75-158 • Issue 1 • July 2003 • Section 4: Operation 4. Place the RF ON/OFF switch on the LPA in the ON position. 5. If using a spectrum analyzer, proceed to step 6. If using a power meter, measure the composite signal power from the STM and then proceed to step 8. 6. 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. 7.
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ADCP-75-158 • Issue 1 • July 2003 • Section 4: Operation Right-click here to open the Remote Fwd Att pop-up screen RF output signal level Figure 4-10. REMOTE LPA Display 2. Check the level of the RF output signal (as determined in Section 2.6) against the system design plan specifications. Table 4-1 shows the output signal level required to provide 5 watts per channel for systems with 1 to 2 channels. The maximum output signal level permitted for the system is 40.5 dBm (11 Watts). 3.
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ADCP-75-158 • Issue 1 • July 2003 • Section 4: Operation Figure 4-11. Remote Fwd Att Pop-Up Screen 6. Verify that the appropriate RF output signal level appears in the RF Pwr-VSWR Low section (see Figure 4-10). This is primarily a reference value and should not take the place of external test equipment when determining the power level of the composite RF output signal.
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ADCP-75-158 • Issue 1 • July 2003 • Section 4: Operation Right-click here to open the Host Rev Att pop-up screen Right-click here to open the Host Div Rev Att pop-up screen Figure 4-12. HOST RF Display 5. Right-click on the Host Rev Att section of the display (see Figure 4-12). The Host Rev Att pop-up screen will open as shown in Figure 4-13. Figure 4-13. Host Rev Att Pop-Up Screen 6. Enter the attenuation value that will provide the required gain.
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ADCP-75-158 • Issue 1 • July 2003 • Section 4: Operation Table 4-2. Reverse Path Attenuation Settings and Nominal Gain Provided ATTENUATION SETTING 2.