User's Manual

GSM/802.11b RadioFrame System Method of Procedure

Final Checkout

RadioFrame Networks, Inc.

5.4 Coverage Validation

After configuring all RFS components, use measurement software, a laptop and a GSM

handset to check for regions of low signal strength or low signal quality (RXQUAL).

5.4.1 Detailed Building Plans—RF Modeling

Testing by RFN has shown that simple Linear Attenuation Models (LAM) as discussed in

COST 231, Chapter 4 section 4.7 “Indoor Propagation Models” work well when used on a

floor-by-floor basis. An attenuation coefficient of 0.62dB/m is recommended for dense,

single-floor propagation, but this can double if concrete walls are present.

5.4.2 Measurement-based Estimate

A battery-powered test transmitter can be moved between each proposed RFU location

and a handheld signal strength meter used to monitor RSSI. This method is useful when

RF penetration is desired through suspect walls or where wall construction data is

lacking. Generally, this method provides good agreement when used to identify regions

of poor coverage rather than to establish sufficient coverage zones. This is because it is

usually inconvenient to duplicate an RFUs’ position during initial coverage surveys.

5.4.3 Floor Plan Estimate

Oftentimes, only simple floor plans are available for the building in which the RFUs are to

be installed. Without specifics about the building construction, such as interior wall, floor

and ceiling construction, propagation models are of limited value. A measurement-based

approach (discussed earlier) works well, but for simple buildings, installing RFUs at the

candidate locations and then testing the results will likely be adequate. If regions of poor

coverage are found, additional RFUs may be added.

5.5 Site Acceptance Guidelines

5.5.1 Site As-Built Documentation

As-built documentation consists of the original site development documentation with post-

installation information. On the job, installers use site development documentation for

reference, to make notes, and to document completion of each step of the installation.

Conduct an onsite walk through to verify that the following Site Development Punch List

items have been properly installed. This inspection ensures that the site installation

meets quality standards.

• Grounding

- buss bar OK (optional)

- BCU/ACU rack(s)

• T1/E1 Information, Primary and Secondary

- T1/E1 circuit ID#

- T1/E1 surge arrestor installed/grounded