User's Manual Part 1

BTS DC Power Cabling (Indoor) – continued
PRELIMINARY
1X SC480 BTS Hardware Installation, Optimization/ATP, and FRU
MAY 2004
4-54
Table 4-27: Procedure to Connect DC Power to the BTS
Step Action
3 For the –48 VDC version, proceed to step 3a.
For the +27 VDC version, proceed to step 3c.
3a Connect the “+” wire (red) to the +0 V terminal.
3b Connect the “–” wire (blue) to the –48V terminal. Proceed to step 4.
3c Connect the “–” wire (black) to the RTN terminal.
3d Connect the “+” wire (red) to the +27 V terminal. Proceed to step 4.
4 Bundle wires together and place ferrite core around wires. Ensure that the wires are not being pinched
before closing and latching the ferrite core.
5 Slide ferrite core as close to the BTS connection as possible without causing stress. Use a tie–wrap on
the ferrite core side away from the connection. The tie–wrap holds the ferrite core in place.
Figure 4-35: DC Power Terminal Strip
NOTE:
1. The TME DC power connection is not
in use unless a TME is used.
2. A surge suppressor is recommended
between the BTS and the DC power
source.
TME
–48V
+0V
20A
SURGE
SUPPRESSOR or
LIGHTNING
ARRESTOR
DC Power from
source
For +27VDC, 25 A would
be indicated on the
escutheon and circuit
breaker
For +27VDC, +27 V and RTN
would be indicated on the
escutcheon
4