Page 9-173
10/2008
AMT/PTD/TR/0020/2/7/EN
9.2.1 Basic wiring checks
Checking the continuity and configuration of the pairs
•
Visually check the configuration of each base station RJ45 connector and of each distribution
frame.
•
Cable test. Isolate the S0 side at the distribution frame and note the impedance of the wiring
+ base station assembly for the 2 or 3 pairs. The values observed must be the same for the
transmit and receive pairs. The clock pair impedance must be greater than approximately 80
ohms.
Checking the distances between base stations and the distribution frame
Note the observed value of the transmit pair and determine the distance between the base
station and the distribution frame using the following table.
Table1: Determining the distance between base stations and the distribution frame
Distance
6/10° cable
5/10°cable
4/10°cable
100 m
18.2 ohms
24.0 ohms
34.0 ohms
210 m
31.6 ohms
43.8 ohms
64.8 ohms
330 m
46.3 ohms
65.4 ohms
98.4 ohms
450 m
60.9 ohms
87.0 ohms
132.0 ohms
570 m
75.5 ohms
108.6 ohms
165.6 ohms
690 m
88.9 ohms
128.4 ohms
196.4 ohms
800 m
103.6 ohms
150.0 ohms
230.0 ohms
Summary of Contents for X Series
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