Service Manual

GSM-205-423
Earthing and transient protection
31st Oct 01
Installation & Configuration: Horizon macro indoor
68P02902W08-B
CONTROLLED INTRODUCTION
Inst. 2–21
Earthing and transient protection
Site earthing
This manual describes only general procedures for earthing the site. Refer to
the
Grounding guidelines for cellular radio installations 68P81150E62 , for
detailed earthing information.
WARNING
Each cabinet must be earthed separately and not daisy
chained together.
 The cell site equipment must be earthed (in the same common earth point
as its power source).
 Provision should be made for routeing earthing lines into the site and to
the cabinet before beginning the installation of the system cabinets.
 There is an earthing terminal (stud) located on the interconnect panel on
top of each cabinet.
 Refer to the site-specific documentation for detailed site earthing
information.
Transient and
lightning
protection
All E1/T1 lines connected to Motorola equipment have secondary transient
protection as part of the BIB or T43 board. Ensure the receive and transmit
antenna connections to the building are fed through coaxial electromagnetic
protection (EMP) devices.
CAUTION
The end user is responsible for transient protection of the
E1/T1 lines connected to Motorola equipment.