2-3
Site Survey Guide for Deploying Cisco 7920 IP Phones
OL-6315-01
Chapter2 Survey Tools
The data in Tabl e 2-1 was created from live tests. Ea ch tool and card combination data point was taken
at the same time from the same distance. The environment was an open office. The floor plan used for
the test is shown in Figure 2-12.
Figure 2-3 shows the ACU screen for dBm. The signal strength shown is -48 dBm, whic h is equal to a
7920 RSSI value of 51.
Figure2-3 ACU Site Survey Window
80 47 –74 34 –69 –67 –72 –69
90 59 –84 31 –68 –70 –71 –71
100 28 –80 31 –72 –78 –69 –75
110 28 –78 34 –78 –70 –77 –79
120 33 –84 32 –77 –71 –77 –78
Table2-1 RSSI, dBm, and Signal Strength Cross-Referenced for 7920 Phones (continued)
1200 Series Access Point @ 11 Mbps @ 20 mW with 2.2 dBm Antennas
Feet
SniffPro
Signal %
access
point dBm 7920 RSSI
350 ACU
dBm
AirMagnet
350 (PDA)
AiroPeek
CB21 dBm
ADU CB21
dBm