User Manual

Ericsson Internal
DESCRIPTION 21 ( 24 )
/ XSNJOER 174/1551-LZA 701 0001 Uen
EAB/ FJG/YP ( Louise Cederlund) 2007-06-12 A
Prepared (also subject responsible if other) No.
Approved Checked Date Rev Reference
Fuses
Table 12 +24 V DC Fuse Recommendation
Minimum for Safe
Function
Recommended for
Maximum Selectivity
Maximum Allowed
Fuse Rating
1×80 A
(1)
1×100 A 1×200 A
(1) May be used when no transmission and/or optional equipment is installed.
8.3 48 to 60 V DC Supply Voltage
Table 13 DC Supply Voltage Requirements
Nominal
48 to 60 V DC
Range
40.0 to 72.0 V DC
Non-destructive range
+0 to
80 V DC
Inrush current 200 A (0.1–5 ms)
Fuses
Table 14 48 to 60 V DC Fuse Recommendation
Minimum for Safe
Function
Recommended for
Maximum Selectivity
Maximum Allowed
Fuse Rating
2×32 A 2×35 A 2×40 A
8.4 Battery Backup
Battery backup can be used to power the site during mains failure and to
protect the site from interruptions in the AC mains supply. It is available in an
external cabinet.
In the event of mains failure, the batteries in the BBS 2000 or BBS 2202
deliver the necessary power to the radio cabinet as well as to the transmission
equipment, if used. This enables the radio system to continue operating during
mains failure. The transmission equipment is provided with power supply
longer than the RBS.
Battery backup can be delivered for at least 1, 2, 4, 6 or 8 hours backup time,
depending on the chosen configuration of the RBS. The BBS can feed +24 V
DC or
48 V DC to transmission equipment. The 48 V DC supply requires
an internal DC/DC converter in the BBS. It is possible to share battery backup
between an RBS 2202 or 2206 and an RBS 2207.