Справочник Пользователя для Adtran TRACERT1L7
P
AGE
22
61280.003L1-1B
4/12/99
Link Distance
Path Loss
(in miles)
(in dB)
1 ........................... 104
2 ........................... 110
3 ........................... 114
4 ........................... 116
5 ........................... 118
6 ........................... 120
7 ........................... 121
8 ........................... 122
9 ........................... 123
10 ......................... 124
11 ......................... 125
12 ......................... 126
2 ........................... 110
3 ........................... 114
4 ........................... 116
5 ........................... 118
6 ........................... 120
7 ........................... 121
8 ........................... 122
9 ........................... 123
10 ......................... 124
11 ......................... 125
12 ......................... 126
A
NTENNA
G
AIN
Best performance will result from the use of a parabolic dish
antenna. Antenna gain is determined by the size of the dish, with
typical figures detailed below. Dish manufacturers will be able to
supply gains for other types of antenna.
antenna. Antenna gain is determined by the size of the dish, with
typical figures detailed below. Dish manufacturers will be able to
supply gains for other types of antenna.
Dish Diameter
Gain
(in feet)
(in dBi)
2 ...................... 21
4 ...................... 27
6 ...................... 31
8 ...................... 33
10 ..................... 35
12 ..................... 37
P
ATH
L
OSS
The free space path loss is given by
Loss(dB) = 96.6 + 20 log
10
f + 20log
10
D
where
D is distance in miles
f is operating frequency in GHz
f is operating frequency in GHz
A tabulation of various path loss is given below.
S
ECTION
2
Link Distance
Path Loss
(in miles)
(in dB)
13 ......................... 126
14 ......................... 127
15 ......................... 128
16 ......................... 128
17 ......................... 129
18 ......................... 129
19 ......................... 129
20 ......................... 130
21 ......................... 130
22 ......................... 131
23 ......................... 131
24 ......................... 132
14 ......................... 127
15 ......................... 128
16 ......................... 128
17 ......................... 129
18 ......................... 129
19 ......................... 129
20 ......................... 130
21 ......................... 130
22 ......................... 131
23 ......................... 131
24 ......................... 132