Cisco Systems 7920 用户手册
4-4
Site Survey Guide for Deploying Cisco 7920 IP Phones
OL-6315-01
Chapter 4 Conducting a WIPT Survey
How To Survey for the WIPT
Figure 4-1
Ideal WIPT Environment
Channel Re-Use
shows the typical channel re-use for 802.11b and 802.11g WLANs. The two gold channel 1
cells are -86 dBm apart from center to center. The same separation should be maintained between floors
of a multi-floor site.
of a multi-floor site.
Figure 4-2
802.11b/802.11g Channel Reuse Diagram
You can use the two Aironet client tools and the survey tool in the 7920 to measure cell separation. The
ACU for the PCM350 client has an active survey mode. Cisco recommends an active survey where there
are transmitted and received packets of the same size as a voice packet.
ACU for the PCM350 client has an active survey mode. Cisco recommends an active survey where there
are transmitted and received packets of the same size as a voice packet.
A typical deployment showing a 15-20% overlap
from each of the adjoining cells.
from each of the adjoining cells.
Provides almost complete redundancy throughout
the cell
the cell
The radius of the
cell should be:
67 dBm
cell should be:
67 dBm
The separation of
same channel cells
should be:
19 dBm
7920 RSSI=20
same channel cells
should be:
19 dBm
7920 RSSI=20
67dB
86dB
135075
Channel
1
Channel
11
Channel
6