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 113 / 221
Strict confidential
1.8.5.3
DC surge protection, 2 poles
To avoid any lightning introduction inside the shelter Kerlink recommends using the
following bipolar DC surge protection: DS72R-48DC from CITEL.
A picture of DS72R-48DC is presented in Figure 70.
The following schematic shows electrical connections of the biipolar DC surge protection to
the Wirnet iBTS and the isolated DC/DC converter:
Figure 75 : DC surge protection 2 poles schematic
Kerlink recommends realizing a good direct connection between the Bipolar DC surge
protection and the earthing system of the installation. The used earthing cable must be as
short as possible (< 50 cm, 4 sq. mm).
The principles of cablig remain identical to those described in §1.8.5.2.
48V
Wirnet iBTS
DC/DC
Isolated
48V
Unipolar
DC surge protection
