User's Manual Part 3

RBS 2109 User’s Guide

Table 51 Connectors

Connector

Torque Nm Remark

TNC 1.7 Nm +/- 0.15 Nm

—

N 2.7 Nm +/- 0.2 Nm

—

9.3 Fault Localisation Using OMT

This section contains information on how to localise a fault when handling

an alarm in the OMT. Ericsson recommends that the OMT is used, but if no

OMT is available, or it is not possible to connect to the RBS, see Section 9.4

Troubleshooting Using the RBS Indicators on page 175.

The section is based on the Replacement Unit Map (RU Map) connected to an

alarm. The RU Map consists of two different kinds of RUs:

• Physical Units

The following RUs are mapped to one single physical unit that can be

replaced in the field.

− IXU

− TIM

− RRU

− Fan unit

• Logical units

The following RUs are handled as one unit, but can actually be one or

more physical units.

− Antenna: The logical path from the RRU to (and including) the antenna

− Battery: The battery backup system including batteries

− Environment: External conditions (ambient temperature and site power)

− GPS receiver: The synch. signal received and distributed by the GPS

receiver

− GPS receiver DXU cable: The logical link between the GPS receiver

and the IXU

− IDB: The installation database stored in the RBS, not the physical

storage

− Y Link: The logical link between IXU and RRU(s)

N/LZT 720 0090 Uen R1A 2004-09-17