Installation Instructions

Mounting and Aligning an IFU

4.5 Link Verification

RF link verification is based on meeting the following objectives:

• Minimizing RF Tx power for dense deployment

• Avoiding “side lobe” link alignment

• Achieving rapid deployment by verifying link at the time of installation

The RF link verification procedure focuses on the RSSI and modem power display for IFU

wireless links. Traditional industry practices utilize path loss calculations to determine RF link

verification, which requires the use of both Tx and Rx power measurements.

However, in an Invisible Fiber system, which uses a closed loop AdTPC method, only the RSSI

or modem power of the link partner determines the actual transmit power. The Tx display in IFU

link manager, therefore, is for reference purposes only.

The Tx power display does play a role during installation to determine whether or not the link is

aligned on a side lobe.

In a correctly aligned link, the Tx power should be within 3 dB of nominal power. To verify Tx

power, refer to the Tx Power graph in the upper-right corner of the IFU link manager Workspace

window.

4.5.1 Prior to Link Verification

Prior to link verification, the following must to be completed:

• IFUs installed according to the procedures described in Section 4.3, Mounting an IFU

• IFUs aligned according to the procedures described in Section 4.4, IFU Alignment

• IFU link manager V1.3 or higher installed

4.5.2 RF Link Verification Procedure

Verify AdTPC Operation and Minimum Power Conditions

To verify that power control is operational via the received signal strength indicator (RSSI), first

ensure that AdTPC is enabled. View the modem power graph on the lower right of the IFU link

manager Workspace window. If modem power is within the threshold settings, proceed to Ve r i f y

Main Beam Alignment. Otherwise, check the IFU setup.

NOTE: Refer to your project manager or liaison for commissioning procedures specific to

your network.