Ericsson RBS 2106 Reference Manual page 94

Product Data RBS 2106
Heat Exchanger
Figure 34
DF
The Distribution Frame (DF) is a connection and overvoltage protection
(OVP) device for external alarms and PCM-links. The DF protects
equipment inside the RBS from overvoltage and overcurrent which may
occur in external lines. Examples of equipment requiring OVP include
transmission lines, ESBs, external alarms and positioning devices (GPS
and LMU).
For more information on the DF, see Section 5.3.3 on page 99.
Distribution Module (DM)
This unit supervises the OVP modules: when a gas discharge tube in an
OVP module degrades, the DM sends a message through the external
alarms to the RBS. In addition, the DM controls the by-pass relay if by-
pass relay is used. It can also distribute +24 V DC to external
transmission equipment or an expansion OVP module.
5.2.2 Cabinet Hardware: OXU Spaces
The following Optional Expansion Unit (OXU) positions are available:
•
•
92 (485)
CCU DC/DC AC/DC
Transformer
Heat
Exchanger
Heater
Supply Air
Block diagram, Air-to-Air Heat Exchanger
Four spaces in the DXU/PSU subrack
One 19-inch OXU-position available between the CXU and the
dTRU subrack.
© Ericsson Radio Systems AB
— All Rights Reserved —
RBS
Return Air
Sub Racks
EN/LZT 720 0008
P008418A
P2A
2001-11-28