Ericsson Radio Systems AB PKRC1311004-1 Manual De Usuario
Unit Description, DXU-21
6
Unit Description, DXU-21
This chapter describes DXU-21. The DXU is a CPU, which acts as an
interface between the transmission network and the transceivers. It also
extracts timing information from the PCM link and generates a timing
reference for the RBS. The DXU also performs supervisory tasks.
interface between the transmission network and the transceivers. It also
extracts timing information from the PCM link and generates a timing
reference for the RBS. The DXU also performs supervisory tasks.
The DXU-21 transmission interface has long haul capability and can be
run on both 1.544 Mbit/s (T1) and 2.048 Mbit/s (E1) PCM links.
run on both 1.544 Mbit/s (T1) and 2.048 Mbit/s (E1) PCM links.
6.1
System Environment
The DXU-21 is designed to work in RBS 2000 Macro radio base
stations.
stations.
This block diagram shows DXU-21 in the RBS 2206 system
environment.
environment.
OXU
DXU
d
T
R
U
d
T
R
U
d
T
R
U
d
T
R
U
d
T
R
U
d
T
R
U
CDU
CDU
CXU
PSU
FAN
FAN
Cabinet LEDs
EPC-
bus
External alarms
ESB
ESB
Transmission lines
IOM-
bus
Y-links
P007455C
Option BFU
CDU
OMT
GPS
EOM
Cabinet ID
Figure 63
DXU-21 environment
EN/LZT 720 0008
R1A
2001-06-26
117 (421)
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