Product manual

Configuration directions, Powering BS330, BS340, BS370 type base stations
Technical Product Manual - DCT1800-GAP
TD 92093 (1/LZBNB 103 108 R4D) / 2006-03-09/ Ver.C
© 2006
25
Chapter 5 Powering BS330, BS340, BS370 type base stations
5.1 General
After a base station plan has been made (see paragraph 3.6) it must be established which powering
method is most suitable to power the base stations. The methods to power a base station are as follows:
• Via the radio exchange
• By a local power supply
The choice of the method depends upon:
• The distance between the radio exchange and the base stations
• The total number of base stations
• Whether power back-up is needed or not
• Installation costs
Paragraph 5.2 describes the powering of base stations by means of a local power supply (AC-adapter).
Paragraph 5.3 describes the powering options for the modular cabinet (BDV 101 01/n).
The length limits for the base station cable are described below.
Data limited length of the base station cable
Data transmission via twisted pairs is limited to a certain range. The ‘data limited’ length of the cables
between the radio exchange and the base stations depends on the control board used (CLU, CLU-S
or SLU), the characteristics of the cable and the noise on the cable.
As it is not possible to predict the noise level in an environment and its influence on a cable, the values
from the table shall be taken as a guide line more than a rule. Practically, the maximum lengths may
exceed these values, if there is less noise and vice versa if there is more noise.
Power limited length of base station cable
When a base station is powered remotely via the cabinet, the maximum length between the base
station and the radio exchange depends on the supply voltage, the number of twisted pairs used and
the wire size. The length of the cable should never exceed the ‘data-limited’ length of the cable,
however.
5.2 Powering base stations by a local power supply
When base stations are powered by a local power supply, only a cable with two twisted pairs is required
between a base station and the radio exchange for data transfer (see figure
10). Powering this way
is suitable for distances between the radio exchange and the base stations of up to 3.5 km.
Powering base stations with a local power supply can be done by using the Express Powering Pair
(EPP) connection of the second data/power inlet on the base station. Base stations can be powered
individually by an AC-adapter or in clusters from a central power source. For individual powering
special AC-adapters (BSX-0013 – 16) are available. This AC-adapter is provided with an 8-pin RJ45
plug that can be plugged into the second data/power inlet. A cluster of base stations can for instance
be base stations on the same floor or in the same building. These base stations must be close enough
to the central power supply.