ADC DLC1902B User Manual

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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).

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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)

tot

Where,

is the total composite powe r in dBm

tot

is the power per carrier i n dBm as meas u red in s tep 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. 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

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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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

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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.

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Figure 4-7. HOST Site Name Pop-Up Screen

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. Right-click on the REMOTE Site Name field (see Figure4-6). The Site Name pop-up

screen will open. Enter a unique name for the REMOTE. 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 lette r. Click on OK to close the screen and make the changes take effect.

6. Open the Tools menu at the top of the main window and then select Refresh Catalog to make the new Host and Remote sit e names appear in the View menu.

2.5 Enter Host Forward Attenuation

The HU internal forward path attenuator setting determines the maximum composite output signal level at the STM antenna port. The appropriate attenuation value for any particular system is based on the number of channels the system is transporting and the level of the composite forward path signal input at the HU’s FORWARD RF IN port. The maximum output power that can be provided by the system is 40.5 dBm (11 Watts). The total forward path gain that is provided by the system (with host and remote forward attenuators set to 0 dB) is 80.5 dBm. Use the following procedure to set the forward path attenuation to provide the maximum composite output signal level:

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

1. Click on the HOST RF tab. The HOST RF display will open within the EMS main window as shown in Figure 4-8.

2. Right-click on the Host Fwd Att section of the display (see Figure 4-8). The Host Fwd Att pop-up screen will open as shown in Figure 4-9.

3. Obtain the value of the total composite input signal level as determined in step 10 of

Section 2.3.

4. Determine the appropriate value to enter for the Host forward path attenuator by subtracting the required system output level (per system design plan) from 80.5 (the total system gain) and then adding the composite input signal level. The result (see sample calculation) is the amount of atte nuation required.

Atten Required = 80.5 – (Required Syste m Output Power) + (Composite Input Power)

5. Enter the attenuation value and click OK to close the pop-up screen and to make the changes take effect.

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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 po wer level:

1. Verify that RF ON/OFF swit c h on the LPA in the OFF posi tion.

2. Disconnect the antenna cable from the STM ANTENNA port.

3. Connect a spectrum analyzer or RF power meter to the STM ANTENNA port. (Check the input rating of the test equi pment. Insert a 30 dB 100 W attenuator if necessary.)

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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 po wer from the STM and then proceed to step 8.

6. Measu re the RF level of a single ca rrier, such as the con trol channe l, in dBm. Mak e sure the resolution bandwi dth of the spectrum analyzer is 30 kHz.

7. Calculate the total composite signal po wer using the following formul a:

= Pc + 10Log N – (see Note)

tot

Where,

is the total composite powe r in dBm

tot

is the power per carrier i n dBm as meas u red in s tep 6, 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.

8. Record the result measured in step 5 or calculated in step 7.

9. Place the MUTE/NORM/RESET switch on the LPA in the OFF position.

10. Disconnect the spectrum analyzer or RF power meter from the STM ANTENNA port.

11. Re-connect the antenna cable to the STM ANTENNA port.

Note: To comply with Maximum Permissible Exposure (MPE) requirements, the maximum composite output from the antenna cannot exceed 1000 Watts EIRP and the antenna must be permanently installed in a fixed location that provides at least 6 meters (20 feet) of separation from all persons.

2.7 Enter Remote Forward Attenuation

The STM internal forward path attenuator setting is used to reduce the power level of the composite output signal level at the STM antenna port. The maximum composite output signal leve l at the STM antenna port is set using the Host internal f orward attenuator (see Section 2.4). However, component va riations may result in the output power at the STM antenna port being slightly above or below the required power per channel. If this is the case, the STM forwa rd attenuator may be used in conjunction with the Host forward attenuator to add or remove attenuation to produce the required output signal level. If less power is required, the STM forward attenuator may be used to reduce the power level. The default setting is 0 dB. Use the following procedure to change the STM forward atte nuation:

1. Click on the REMOTE LPA tab. The REMOTE LPA display will open within the EMS main w i ndow as shown in Figure 4-10.

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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 Sectio n 2.6) ag ainst the syst em 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. Dete rmine i f mor e or l e ss a t tenu ati on is r equ ire d to pr o duce the r equi re d out put s ig nal le v el .

4. Right-click on the Remote Fwd Att section of the display (see Figure 4-10). The Remote Fwd Att pop-up screen will open as shown in Figure 4-11.

5. Enter the required attenuation value and click OK to close the pop-up screen and to make the chang es take effect .

Table 4-1. Composite Output Signal Levels

NUMBER OF

CHANNELS

137 dBm 240 dBm

When there are three or more channels, each channel will al ways be le ss th an 5 watt s si nce the system has a maximum power output of 11 watts (40.5 dBm).

OUTPUT SIGNAL LEVEL

REQUIRED TO PROVIDE 5

WATTS PER CHANNEL

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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. Depending on the modulation type and number of channel s, the EMS software may report a power level that is higher or lower than the actual RF output signal.

2.8 Enter Host Reverse Attenuation

The level of the RF signal that should be input to the BTS will vary depending on the type of BTS, the receive distribution, and the number of channels present. To interface with the BTS, the reverse path signal level must be adjusted to provide the signal level required by the BTS. The HU provides from –1 dB of gain to +30 dB of gain in the reverse path. Use the following procedure to set the reverse path gain:

1. Check the BTS manufacturer’s specifications to determine the composite signal level required at the BTS reverse path input port.

2. Determine the overall gain and loss imposed on the signal by the antenna, antenna cable, and by the cables that connect the HU to the BTS.

3. Determine the amount of gain required to raise the reverse path signal to the level required at the BTS.

4. Click on the HOST RF tab. The HOST RF display will open within the EMS main window as shown in Figure 4-12.

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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). T he Host R ev 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. R efer to Table 4-2 for the attenuation values and the corresponding gain (nominal) values.

7. Click OK to close the pop- up screen and to make the changes take effect.

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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

GAIN

PROVIDED

0 dB → 30 dB 11 dB → 19 dB 22 dB → 8 dB

1 dB 29 dB 12 dB 18 dB 23 dB 7 dB 2 dB 28 dB 13 dB 17 dB 24 dB 6 dB 3 dB 27 dB 14 dB 16 dB 25 dB 5 dB 4 dB 26 dB 15 dB 15 dB 26 dB 4 dB 5 dB 25 dB 16 dB 14 dB 27 dB 3 dB 6 dB 24 dB 17 dB 13 dB 28 dB 2 dB 7 dB 23 dB 18 dB 12 dB 29 dB 1 dB 8 dB 22 dB 19 dB 11 dB 30 dB 0 dB 9 dB 21 dB 20 dB 10 dB 31 dB –1 dB

10 dB 20 dB 21 dB 9 dB -- --

2.9 Enter Host Forward and Reverse Delay

The forward and reverse delay function allows entry of from 0 to 63 µsec of delay in the forward and reverse path s. This featu re is used when mu ltiple sys tems are used to tran sport th e same channel and the re is a signif icant diff erence in the path delay between systems. Additional delay may be e ntered to balance the over all system delay. The amount of delay required must be calculated by the RF engineer and should be included in the system design plan. The default setting is 0 µsec. Use the following procedure to change the forwa rd and reverse path delay:

ATTENUATION

SETTING

GAIN

PROVIDED

ATTENUATION

SETTING

GAIN

PROVIDED

1. Click on the HOST RF tab. The HOST RF display will open within the EMS main

window as shown in Figure 4-14.

Right-click here to

open the Host Fwd

Delay pop-up screen

Right-click here to

open the Host Rev

Delay pop-up screen

Right-click here to

open the Host Div Rev

Delay pop-up screen

Figure 4-14. HOST RF Display

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ADC DLC1902B User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual