Wirnet iBTS
Document title : Installation and
Maintenance Manual
Version : 2.0
Author : SNI
Date : 04/12/2018
Classification
This document is the strict property of Kerlink and shall not be either copied nor sent without express
written authorization of Kerlink
Internal Use
Kerlink m2m technologies reserved rights
Confidential
Kerlink – 1 rue Jacqueline Auriol – 35235 THORIGNÉ-FOUILLARD
Page 85 / 221
Strict confidential
iBTS is directly connected to the earthing system of the installation, dysfunction may occur
without additional insulation. In such casing, Kerlink recommends using additional isolated
DC/DC.
The following drawing shows the insulation importance of an additional isolated DC/DC
power supply:
Figure 45 : Required isolation on auxiliary power supply input
An example of 40W isolated DC/DC converter is provided in the chapter 1.6.3
1.6.3
Isolated DC/DC converter 40W
As detailed in paragraph 1.6.2, some specific installation using -48V DC supply require an
isolated DC/DC converter.
The characteristics of a 40W isolated DC/DC converter are detailed in the following table:
Description
Specification
Input Voltage
48V DC typ.
18-75V DC range
Input current at full load
0.93A
Undervoltage Lockout
ON at >18V
OFF at <16V
Remote On/Off
On: Logic High (3.5-12 V) or open circuit
Off: Logic Low (<1.2 V) or short pin 1 to pin 2
0V
-48V
48V
Wirnet iBTS Station
DC/DC
Isolated
