Xirrus Wi-Fi Array XR4420 User Manual

Wi-Fi Array
78 Installing the Wi-Fi Array
inappropriate environment, the signal quality will suffer and throughput will
decrease. See “Global Settings .11n” on page 291 to configure the guard interval.
Obtaining Higher Data Rates
The data rate increase obtained by using 802.11n on an Array is incremental,
based on the technologies that are applied and the options that you select:
 Higher encoding rates (Mandatory in 802.11n)
 Spatial Streams (Mandatory, but multiplier varies directly with number of
streams selected.)
 Channel Bonding (Mandatory in 802.11n, apply multiplier to IAP if it is
bonded.)
 Short Guard Interval (Optional)
See Figure 27 to compute your 802.11n data rate increase for an IAP. Apply this
increase to the 802.11 a, b or g data rates selected for the Array.
Figure 27. Computing 802.11n Data Rates
Optionally
Multiply By 2.077
to Bond
Two 20MHz
Channels
Optionally
Multiply by 1.11 for
Shorter Guard Interval
to Increase
Symbol Rate
Optionally
Multiply by 2, 3, 4
for the Number of
Additional
Spatial Streams
Choose New Base
Encoding + Modulation
BPSK (6.5)
QPSK (13, 19.5)
QAM-16 (26, 39)
QAM-64 (58.5, 65)
New 11n
Data Rate
xxx =
Expected First Generation Device Data Rates
Expected 802.11n Data Rates
802.11a 802.11g
Rates
6
9
12
18
24
36
48
54
11n Mandatory
Data Rates
6.5
13
19.5
26
39
52
58.5
65
With Channel
Bonding (40MHz)
13.5
27
40.5
54
81
108
121.5
135
With Short
Guard Interval
15
30
45
60
90
120
135
150
Two Spatial
Streams
13
26
39
52
78
104
117
130
With Channel
Bonding (40MHz)
27
54
81
108
162
216
243
270
With Short
Guard Interval
30
60
90
120
180
240
270
300
One Spatial Stream Two Spatial Streams

Xirrus Wi-Fi Array XR4420 Specifications

General

Brand	Xirrus
Model	Wi-Fi Array XR4420
Category	Speaker System
Language	English