Adtran TRC6410L2X ユーザーズマニュアル
TRACER 6000 Series Integrated System Manual
Section 2 Microwave Path Engineering Basics
612806420L1-1D
Copyright © 2005 ADTRAN, Inc.
27
7.
OTHER CONSIDERATIONS
Path Availability
The path availability of a wireless link is a metric that expresses the fractional amount of time a link is
available over some fixed amount of time, and depends on several factors. Path availability is expressed as
available over some fixed amount of time, and depends on several factors. Path availability is expressed as
where the parameters are
a
terrain factor
b
climate factor
f
carrier frequency (GHz)
d
path length (miles)
F
fade margin (dB)
or
Table 11. Minimum Antenna Height for Given Path Lengths (km and m)
Path Length
(kilometers)
Min. Antenna Height
at 2.4 GHz
(meters)
Min. Antenna Height
at 5.8 GHz
(meters)
2
8.0
5.1
4
11.4
7.4
6
14.2
9.3
8
16.8
11.1
10
19.2
12.8
14
23.8
16.3
16
26.1
18.2
18
28.5
20.0
20
30.9
22.0
22
33.3
24.0
24
35.9
26.1
26
38.4
28.3
28
41.1
30.6
30
43.9
32.9
32
46.7
35.4
34
49.6
38.0
36
52.6
40.6
A
1
2.5
10
6
–
×
(
)abfd
3
10
F 10
⁄
–
(
)
–
[
] 100%
×
=
(%)
A
1
6.00
10
7
–
×
(
)abfd
3
10
F 10
⁄
–
(
)
–
[
] 100%
×
=
(%)