Reference Manual

Product Data RBS 2106

The external alarms are deﬁned at the installation. They are deﬁned by

using the Operation and Maintenance Terminal (OMT) or from the BSC

using the remote OMT.

OVP Module for PCM Lines

The Distribution Frame (DF) provides overvoltage protection for PCM-

lines. In addition, a PCM-line can be provided with a balun (balanced/

unbalanced transformer) to convert an unbalanced 75



line to a

balanced 120



line.

P008443A

OVP Board

By-pass Board,

Balun Board,

or Dummy Board

Figure 41 OVP Module for PCM Lines

Each module provides overvoltage protection for two PCM lines.

The overvoltage protectors (OVP) are mounted on an OVP board

inserted into a slot connector in the OVP module. An OVP board

contains gas discharge tubes and serial fuses for protection of two lines.

The other slot connector in the OVP module can be equipped with

several options:

• A dummy board, when the transmission system is twisted pairs.

• A balun board. RBS 2106 is designed for 100/120



balanced

(twisted pair) cable. If 75



unbalanced (coaxial) cable is to be

100 (485)

EN/LZT 720 0008 P2A

2001-11-28

Preliminary