User's Manual

Ericsson Internal
DESCRIPTION 42 ( 46 )
/ XSNSIXI 198/1551-LZA 701 0001 Uen
CBC/XRX/M (Kai Lian) 2011-05-05 C
Prepared (also subject responsible if other) No.
Approved Checked Date Rev Reference
Table 19 DC Supply Voltage Requirements for MU and RRU-N
Description MU RRU-N
Nominal voltage –48 V DC –48 V DC
Operating voltage range –40 to – 57.6 V DC –40 to – 57.6 V DC
Non-destructive range 0 to – 60 V DC 0 to – 60 V DC
Note: The optional AC PD box can be distributed to up to four PSU-AC users.
Note: The MU and the RRU-N can be equipped with PSU-AC to use AC
power. The distance from MU or RRU-N to the PSU-AC should be
less than 10 m considering the lightning protection.
10.1 Fuse Recommendations
This section provides information about fuse recommendations. The values
stated in this section apply to the worst-case power consumption of a fully
equipped RBS. For information on power consumption during traffic, see
Section 10.2 on page 42, where maximum power consumption is given.
The MU and the RRU-N must be protected either by an external fuse
and a mains switch, or by a circuit breaker. The table below shows the
recommendation for both a fuse and circuit breaker.
Table 20 Fuse Recommendation for MU and RRU-N
Unit
Minimum for Safe
Function
(1)
Recommended
for Maximum
Selectivity
(2)
Maximum
Allowed Fuse
Rating
(3)
MU DC-powered 1 A 1 A 2 A
RRU-N DC-power
ed
12 A 12 A 16 A
(1) Minimum for Safe Function means that the external fuse is one class larger than
the internal fuse.
(2) Recommended for Maximum Selectivity means that the external fuse is chosen so
that in all cases the internal fuse will blow before the external one.
(3) Maximum Allowed Fuse Rating means an absolute maximum fuse class according
to the design of RBS.
Note: Fuses can be blown by currents or caused by lightning.
10.2 Power Consumption
The table below shows the RBS power consumption figures for AC or DC of the
MU and the RRU-N.