User's Manual

Doc. No.
Rev.
Date
DRAFT
1.01
2012-01-27
Damm Cellular Systems A/S, Denmark
TetraFlex
®
7.5 Manual - BS421
TetraFlex® 7.5 Manual 1-20
1.2.6 Power connection to SB421
Before starting on this task, please read the entire chapter carefully.
LAN / 1sec
Figure 1-18: Power connection
The BS421 is operated at -48V nominal DC SELV (Safety Extra Low Voltage). The provision
of power is done via the SB421 TR1/TR2 connection module. See the SB421 installation
section for information on the connection pin out for SB421.
DO NOT UNDER ANY CIRCUMSTANCES USE A POWER SUPPLY THAT HAS
THE MINUS CONNECTED TO POWER SUPPLY CHASSIS
The cables used for power supply must be equal to or more than 3 x 1,5mm
2
Connect the three wires in the power connection cable according to the color markings inside
the BS421 system connector.
GND
0 V
- 48V
RX/TX A RXB PS LAN GPS OUT A