Nortel Networks DCT1900 Base Station Powering, Powering Base Stations by a Remote Power Supply

Technical Product Manual - DCT1900

Configuration Directions, Base Station Powering

CHAPTER 4

Base Station Powering

4.1General

After a Base Station plan has been made (see Chapter 3), it must be established which powering method is more suitable to power the Base Stations. The methods for powering a Base Station are:

zVia the RE

zBy a remote power supply

The choice of the method depends upon:

zThe distance between the RE and the Base Stations

zThe total number of Base Stations

zWhether power back–up is needed or not

zInstallation costs

Paragraph 4.2 describes the powering of Base Stations by means of a remote power supply. Paragraph 4.3 describes the powering options for the Modular Cabinet. The tables used in this chapter are given in Paragraph 4.4.

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 RE and the Base Stations depends on the system board used (CLU or SLU), the characteristics of the cable, and the noise on the cable. Table 4–1 shows the data limited length for some cables.

Note:

Since it is not possible to predict the noise level in an environment and its influence on a cable, the values from the table should be taken as a guide-line more than a rule. Practically, the maximum length may exceed these values, in case 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 via the cabinet, the maximum length between the Base Station and the RE 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.

4.2Powering Base Stations by a Remote Power Supply

When Base Stations are powered by a remote power supply, only a cable with two twisted pairs is required between a Base Station and the RE for data transfer (see Figure 4–1).

Powering Base Stations with a remote power supply can be done by using the EPP pins on the Base Station connector. Base Stations can be powered individually or in clusters from a central power source. A cluster can be e.g. Base Stations on the same floor or in the same building, assuming that Base Stations within the cluster are close enough to the remote power supply. The length of the cable between the Base Station and the RE is "data limited". See Table 4-1 for the maximum cable length.

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