Nokia of America Corporation BBTRX-22 Benutzerhandbuch

Notes:

1. The ferrite required depends on the outside diameter (OD) of the DC power cable.

2. Once installed, the ferrite must be secured in close proximity (as defined in the

table) to the DC connector on the power cable.

The wire used for the DC feeders shall be rated for the environmental condition in which
it is used and shall be rated and sized according to the applicable sections of the National
Electrical Code (NFPA 70) or the Canadian Electrical Code, Part 1 (CSA C22.1) for NAR
markets, or the local electrical code in use. Ensure that the most current versions of the
previously mentioned documents are used. The circuit breaker characteristics shall be
equivalent to Airpax Inc., model LEL/LML, circuit breakers with type 51, DC trip delay
curve characteristics.

DC input surge requirements

The DC input interface of the Alcatel-Lucent B25 RRH4x30 is equipped with electrolytic
capacitors to reduce noise, ripple, and the effect of transients. The capacitors can draw a
high inrush current when power is first applied to the B25 RRH4x30.

DC input

Inrush current

(Amps)

Time

(Milliseconds)

–48‑V DC

600 to 1200

up to 1

The circuit breakers providing DC power to the Alcatel-Lucent B25 RRH4x30 must be
able to withstand this high inrush current. The Airpax Inc., model LEL/LML, circuit
breakers with type 51, DC trip delay curve characteristics is rated to withstand the inrush
current.

Overload trip characteristics

The following table provides the overload trip characteristic for the Airpax circuit breaker
with type 51 delay characteristics. If an alternate circuit breaker is used, it must have
equivalent overload trip characteristics.

Airpax model LEL/LML type 51 Overload Trip Time

(Seconds)

Rating

100%

125%

150%

200%

400%

600%

800%

1000%

Time
(sec.)

No trip

0.5 to
6.5

0.3 to 3

0.1 to
1.2

0.3 to
0.5

0.011 to
0.25

0.004 to
0.1

0.004 to
0.08

Electrical power requirements for –48‑V DC power systems

DC Power requirements

....................................................................................................................................................................................................................................

January 2015

Alcatel-Lucent – Proprietary

Use pursuant to applicable agreements

C-7

R
AFT