Ericsson RBS 2106 Reference Manual page 102

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
balanced 120
By-pass Board,
Balun Board,
or Dummy Board
Figure 41
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:
•
•
100 (485)
line.
OVP Module for PCM Lines
A dummy board, when the transmission system is twisted pairs.
A balun board. RBS 2106 is designed for 100/120
(twisted pair) cable. If 75
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OVP Board
unbalanced (coaxial) cable is to be
line to a
P008443A
balanced
EN/LZT 720 0008 P2A
2001-11-28