Chapter 6 Installation 6.3.6 Rooftop Antenna Placement Tool P R E L I M I N A RY 6.3.6 Rooftop Antenna Placement Tool Reference: Rooftop Antenna Placement Tool This is a picture of the worksheet in the Antenna Placement Tool for a quick visual identification Figure 6-17); this appendix does not include the entire tool. Please use the electronic copy of the tool to datafill the site information. This form can be found on the following LiveLink site: https://tools.cisco.
Chapter 6 Installation 6.3.7 Set the Downtilt P R E L I M I N A RY 6.3.7 Set the Downtilt Based on coverage objectives determined by previous RF planning, the AU may need adjusting upward or downward once mounted on the pole, tower, roof, building, or other structure. The panel antenna has a -6° built-in electrical downtilt. You will use an inclinometer to read the mounted position and to determine what adjustments, if any, need to be made.
Chapter 6 Installation 6.3.8 Antenna Orientation P R E L I M I N A RY Figure 6-19 Downtilt Adjustment Assembly Downtilt Adjustment Bracket Bolts 6.3.8 Antenna Orientation The magnetic declination, which is the angular difference between observed magnetic north on a compass and geographic (or “true”) north, shifts from year to year. Panel antennas must be oriented appropriately as required by the RF plan.
Chapter 6 Installation 6.
Chapter 6 Installation 6.4.2 System Ground Cabling P R E L I M I N A RY Warning Read the installation instructions before connecting the system to the power source. Statement 1004 Warning When installing or replacing the unit, the ground connection must always be made first and disconnected last. Statement 1046 Note It is strongly recommended that no switch or disconnect device be installed in the ground cabling.
Chapter 6 Installation 6.4.3 System Power Cabling P R E L I M I N A RY 6.4.2.1 Lightning Protection Lightning protection information is covered in Chapter 5, “Pre-installation.” Please review that section before continuing with the installation process. 6.4.2.1.1 Surge Arrestors The BWX 8415 Basestation contains primary lightning protection on the GPS cable and the -48V power cable. A DC primary lightning protector is also recommended at the output of the main power supply. 6.4.
Chapter 6 Installation 6.5 Fiber-Optic Cabling P R E L I M I N A RY Figure 6-22 Power Cable Leads Installed 6.5 Fiber-Optic Cabling Warning Class 1 Laser product. Statement 1008 General fiber cable information was covered in Chapter 5, “Pre-installation.” Please refer to 5.8 Fiber-optic Cable Selection and 5.11 Confirm AAA, BWG, and Backhaul Network Availability for information about the required fiber-optic cable and the backhaul connectivity.
Chapter 6 Installation 6.6.2 Test the Backhaul Connection P R E L I M I N A RY Figure 6-23 Step 2 I/O Cable Cover Tighten the screws on the I/O cover securely to prevent water from leaking into the unit. 6.6.2 Test the Backhaul Connection If required in the Responsibility Assignment Matrix (RAM) or project plan, test the backhaul to the customer demarcation point.
Chapter 7 Commissioning 7.7 Calibration P R E L I M I N A RY 7.7 Calibration 7.7.1 What it Means to Calibrate Performing a calibration on the BS detects the phase differential between the antenna elements and matches the output power across all antenna elements in the BWX 8415 Antenna Unit. On a new installation, the calibration procedure should be performed at least 3 times to verify consistency of the returned values.
Chapter 7 Commissioning 7.7.3 Calibration Procedure P R E L I M I N A RY When the BS is calibrated, the measured values are stored in the BS and then reported to the EMS to be stored under Air Interface > Layer 1. The Digital card pre-calibration values are placed in the General tab. The TX and RX gain values are placed in the Antenna Table. 7.7.
Chapter 7 Commissioning 7.7.3 Calibration Procedure P R E L I M I N A RY Figure 7-43 Full Calibration Click on the “Antenna Table” tab Click on “Calibrate” Select “Full Calibration” and click on “Calibrate” Click on “Yes” Note If you forgot to provision the BS in the EMS database, you will see the error shown in Figure 7-44. Click on Ok and refer to 7.6.3 Provision the BWX 8415 Basestation.
Chapter 7 Commissioning 7.7.3 Calibration Procedure P R E L I M I N A RY Figure 7-45 Calibration Results Step 7 Click on Show Configuration to see if the calibration is successful. In the EMS CAM highlight the BS and check the Antenna Table transmit and receive gain values (Figure 7-46). Note A value of zero indicates that a proper value for the gain for that path (either in the TX or Rx direction) could not be found.
Chapter 7 Commissioning 7.7.3 Calibration Procedure P R E L I M I N A RY To determine if a problem exists, use the following information: • At the BS console, look at the cal error message. The calibration should pass without any errors. • Look at the Transmit Gain values. They should be relatively close to each other (values: 1 - 64). • • Find the median Transmit Gain value. The median is the value that falls in the middle of the lowest to highest values.
Chapter 7 Commissioning 7.7.3 Calibration Procedure P R E L I M I N A RY Compare the values of both calibrations. The corresponding results should be within +/- 3 units. Close the Configuration window, and click on Show Configuration to move the second calibration values into the main window. Next, perform a third calibration (Steps 4-8) and compare the results with the second calibration values. An example of successful calibration results is provided in Figure 7-48.
Chapter 7 Commissioning 7.7.3 Calibration Procedure P R E L I M I N A RY Figure 7-49 Calibration With Errors Data received from Layer1: antenna 0 1 2 3 4 5 6 7 txGain 18 15 17 18 15 17 17 0 carrierId 0 0 0 0 0 0 0 0 1 1 Here isisthe the key Both Here gains and key alltoto the interpret phase Here the key to the error shifts the calibration calibration for this path error are code set to zero. interpret the calibration error rxGain 67 67 63 71 68 70 63 0 antenna 0 1 2 3 4 5 6 7 0 1 txCalWeightX 32.
