User's Manual

48 Site Survey ROAMEO System
Bosch Security Systems, Inc.
Technical Manual
F.01U.306.750
Rev. 01
Description of QF
9. Mark the access point’s location on the building layout diagram.
10. Walk around with the beltpack throughout the area(s) of interest while looking at the site survey screen.
NOTE: Record the RSSI and QF number on the building layout diagram at several locations throughout the area of
interest.
NOTE: When enough data points are collected, draw a line on the building layout, using the coverage limits. If surveying
for roaming coverage, take note access point coverage is shown in Figure 6 on page 27.
Notes
• Try other access point locations to improve the RF coverage in the desired area, if needed.
• If setting up a roaming system, ensure a good overlap of coverage areas of the access points. Good
roaming between access point areas requires overlap of coverage for error free roaming.
• The access points that support roaming beltpacks should have an RSSI of >80 from each access point
involved in the overlap to provide error free roaming. See Figure 6 on page 27.
• In high beltpack density areas, where more than six access points on wideband (G.722) or more than 10
access points on narrowband (G.726) are required to provide coverage over the same area due to a larger
number of beltpacks, it is important the access points are located in good RF coverage of each other. In
these scenarios, the access points need to be within -70 dBm of each other. This translates to each
access point should be in a coverage area with an RSSI reading of 112 or better on a site survey. See
Figure 7 on page 28.
QF Color Description
0-4 Red Weak - too many dropouts in the area
5-6 Yellow Marginal - some dropouts of audio in the area
7-10 Green Strong - good RF coverage
GOOD COVERAGE AREA DEFINITION
RSSI = 71-216, Site survey bar in the green.
QF = 7-10, Site survey bar in the green.
If the two indications are different, always use the worst case of the RSSI and QF
indication for defining a good coverage area. Example: QF =10 and RSSI=71, use the
RSSI level as the cutoff for the good coverage area.