Base Station System ND 951
R&S BICK Mobilfunk GmbH
DVers.: 01 / 28.01.99
951_ENG.DOC
Page: 7 / 14
2.3.3 220 V Main Connection
The cabinet is connected to 220V by taking the power cable2 through the square opening at the
rear of the top panel to the connection box at the front. For this, the protection grids at the top panel
and the front panel have to be removed. Then the clips L1, N1, and SL (protective ground
conductor) are connected. The system works with a single-phase supply and should be protected by
at least 10A.
2.3.4 60 V or 48 V DC Connection
The cabinet is connected to the DC power supply by taking the cable through the square opening at
the rear of the top panel to the connection box at the front. For this, the protection grids at the top
and the front panel have to be removed. When connecting to the electricity mains ensure that the
correct polarity has been chosen. Before the device is switched on, the voltage must be measured.
Attention!
The mains power supplies PS914DC/928DC have to be switched over to the correct
power supply voltage.
Switching over the mains power supplies
The mains power supplies are disconnected from the sub-rack. At the top of the left panel under the
protection grid is a slide switch marked with 48V/60V. This switch can be moved into the correct
position, eg. with a screw driver. When it is adjusted, the mains power supply must be marked with
the respective voltage.
Moreover, the power connection can be made to the customers’ individual requirements, eg. by
means of a XLR-plug.
2.3.5 4-wire Connection
The 4-wire connection is linked to the MMX within the system itself and requires no alterations.
2.3.6 Antenna Connections
The cabinet has its own antenna connections, RX (Type N female) and TX (Type 7/16 inch female).
2.3.7 Connecting the House Alarm System and external Alarms
House alarm and external alarms are connected to the connection box of the cabinet. From there
they are connected to the CCU, which distributes them to all transceivers. For each alarm input
there are 2 connections. One of them carries the potential (+5V DC) and the other one the
corresponding grounding (GND). The alarm is activated by short-circuiting. It can take up to a
minute until the activated alarm reaches all channel units.
2
For power supply we recommend laying a fixed line, eg. NYM 3x1,5 mm
2
.
