User's Manual

BTS Power Cabling
68P64115A19–4
Mar 2003
1X SC 4812T-MC BTS Hardware Installation - Software Release R2.16.1.x
CONTROLLED INTRODUCTION
2-42
BTS Power Cabling
Objective
The objective of this procedure is to define the BTS’s site power
distribution system requirements, and install the DC power input
cabling.
Important Guidelines
Several guidelines must be followed in the design of the site power
distribution system. Depending on site requirements and specific
guidelines, two different cabling choices are offered in this section,
Option A or Option B. Read this entire section before power cabling the
BTS.
Inrush Current
When the frame is powered on, there is the potential for an inrush
current which exceeds the steady state current draw of the frame. In
order to prevent this inrush current from affecting other equipment,
power feeds and circuit breakers should NOT be shared between the
BTS and any other equipment. This BTS is designed to comply with the
ETS 300-132-2 standard for DC inrush current.
Feeds and Breaker Sizes
Table 2-34 lists different site configurations, depending on the number of
carriers. Select a power distribution system configuration that is most
appropriate for your site. Figure 2-19 identifies the BTS Breaker Panel.
Table 2-34: DC Filter Power Feed Configurations
Number of
Carriers
Number of
Feeds Required
(+ and – pair)
Breaker Size
(per Feed)
Utilize
Cable Option
1–2 1 125A A
3–4 1 250A A
3–4 2 125A B
2