Page 162 01/2007 AMT/PTD/PBX/0020/2/4/EN
8.2 Procedure
Before beginning implementation, check the conformity of the S0 interface cards, the power
supplies, and the positions of the interface cards in the PBX and the configuration of the card
switches (see chapter 4).
It is imperative to respect the order of the following procedures.
• Basic wiring checks
• Check the clock pair polarity when the synchronization type is "third pair".
8.2.1 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.
Table 1: Determining the distance between base stations and the distribution frame
Remote - 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
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