User Manual Part 9

Navini Networks, Inc. Ripwave Base Station I&C Guide
149
Appendix S: Location (FTP) Tests
Introduction
The Location, or FTP, Test is performed to check the Ripwave system operation through file
transfers between the Base Station and the Modem. The test measures the data rate performance
at various locations within the coverage area. Data throughput is measured by executing file
transfers using the FTP protocol for both upstream and downstream links. A file server must be
in place on the same subnet with the BTS to accurately perform the file transfer, and the Modem.
User computer must be loaded with an FTP Client. As the file transfer is running, a data file is
captured by the Modem tool. Data rates are captured by the FTP program.
Data is recorded in a spreadsheet format. The spreadsheet lists the location, GPS, and other
information. As data rates are captured, the results are entered manually. An average SNR and
sync RSSI can be read from the debug tool, and recorded, for quick comparison to the acceptable
criteria (see “Acceptable Criteria” section of this appendix). For NLOS indoor locations, tests are
performed both outside the building and inside, so that the obstruction loss for the building can
be determined. Unless the customer can provide indoor access, all results will be LOS or Near
NLOS.
Planning the Locations
Before the actual testing is conducted, you need to select the test locations.
First, select one Line of Sight (LOS) location about 2 km away from the Base Station. The
results at this location will be as good as you could expect to get from your system and will
constitute your “base line” for future reference.
Second, based on your preliminary RF propagation, select 4 additional locations (LOS or
NLOS), if the Base Station has a panel RFS; or 7, if it has an omni RFS.
Criteria of Acceptability
In order to evaluate the test results, several criteria are taken into consideration. These criteria are
valid for both LOS and NLOS locations.
 Processed Sync Signal Strength: For a given test location, ± 2 dB variation during FTP
 Absolute Sync Signal Strength – Processed Sync Signal Strength: not greater than 2 dB
variation during FTP