Grounding and Lightning Protection⁣

This section describes factors to be considered when planning the proposed link end sites, including grounding, lightning protection and equipment location for the wireless device, power supply and AUX-ODU-LPU-G unit (if installed).

Structures, equipment and people must be protected against power surges (typically caused by lightning) by conducting the surge current to ground via a separate preferential solid path. The actual degree of protection required depends on local conditions and applicable local regulations. To adequately protect a Quanta 5 installation, both ground bonding and transient voltage surge suppression are required.

Grounding and lightning protection recommendations

• The wireless device should be placed on the pole at a height that is at least 1 meter below the top of the pole. In this case, there is a significant probability that the lightning strikes the pole and not the wireless device. The pole should be properly grounded: connected to the building lightning protection circuit according to your local regulations.
•  All equipment must be connected at stabilized and surge protected power sources which must be properly grounded.
• The end of the FTP service cable that is connected to the power supply should be assembled with a shielded RJ-45 connector. The other end of the FTP service cable (connected to the wireless device) should be assembled with unshielded (standard) RJ-45 connector.
• The power supply is grounded via a three-conductor power cord and a grounded socket.
• AUX-ODU-LPU-G grounding is performed using grounding bolt.
• Antenna pole and wireless device should be connected to the common ground ring. Grounding cables should be no less than 10AWG thick and must use corrosion-resistant connectors.

Requirements to the power supply location

Find a location for the power supply that meets the following requirements:

• The power supply can be mounted on a wall or other flat surface.
• The power supply is kept dry, with no possibility of condensation, flooding or rising damp.
• The power supply can be accessed to view status indicators.
• The power supply is located in an environment where it is not likely to exceed its operational temperature rating, allowing for natural convection cooling.
• The power supply can be connected to the wireless device drop cable and network terminating equipment. 
• The power supply can be connected to a mains power supply.

Requirements to the lightning protection unit location

Lightning protection unit (AUX-ODU-LPU-G) is an optional accessory which may be used to serve as a line protection unit for the wireless device and for the indoor network equipment connected to the Ethernet port of the power supply.

AUX-ODU-LPU-G should be properly assembled, mounted and grounded.

General requirements for lightning protection units location:

• For maximum protection of the wireless device, power supply and customer LAN devices, use two lightning protection unit (AUX-ODU-LPU-G).
• The purpose of the LPU at the top is to protect the wireless device from a surge of lightning strike which can hit the long FTP cable run along the height of the pole or on the roof of the building.
• The purpose of the LPU at the bottom is to protect the power supply and customer equipment.
• Make sure to install the two LPU devices in the correct polarity, as shown in the diagram: top LPU with "ETH OUT" facing the wireless device and bottom LPU with "ETH OUT" facing the power supply, and the second LPU units connected to each other via "ETH IN".
• Install each LPU as close as possible to the device it protects.
• The cable length between the top LPU and wireless device should be minimum, as well as the cable length between bottom LPU and power supply. Keep most of the power supply - wireless device FTP cable length between the two LPU devices.
• Use the lightning protection unit to protect all circuits for signal transmission and power supply (video, audio, management signals, Ethernet, etc.).
• Regularly (especially before the periods with high thunderstorm activity) check the integrity of lightning protection units, grounding elements and bonding conductors.
• The grounding and lightning protection initial procedures when using AUX-ODU-LPU-G are similar to those when using regular power supply.

Connectors scheme connection in case of using one LPU:

Connectors scheme connection in case of using two LPU:

AUX-ODU-LPU-G grounding scheme

Lightning protection unit mounting

AUX-ODU-LPU-G can be mounted on a pole, using clamps. Attach the grounding cable (min cross-section 2.5 mm²) to the case, using grounding bolt.

During AUX-ODU-LPU-G mounting it is necessary to provide a small loop of the FTP Cat5e cable that should be below the cable gland. These ensure that water is not constantly channeled towards the connectors. It will also serve as a cable compensator for the cable linear expansion as the temperature difference result.

AUX-ODU-LPU-G cable gland assembly procedure

In order to ensure that the cable gland remains sealed under any environmental conditions, please, follow the assembly sequence according to the procedure below:

• Step 1: Insert the sealing insert into the clamping claw.
• Step 2: Assemble the cable gland by putting the thread-lock sealing nut, clamping claw with sealing insert and body onto the cable as shown on the figure.
• Step 3: Insert the clamping claw with sealing insert into the body as shown on the figure.
• Step 4: Crimp the standard RJ-45 connector onto the cable using crimping tool. Pin-out scheme: T568B wiring standards.

• Step 5: Insert the Rj-45 connector into the corresponding socket until you hear a click.
• Step 6: Screw the cable gland body into the port and tighten it. Do not apply excessive force.
• Step 7: Tighten the thread-lock sealing nut. Do not apply excessive force.