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Ericsson Radio Systems AB PKRC1311004-1 Manual De Usuario

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Unit Description, DXU-21
6.2
Block Diagram
Ext. Sync. Source (GPS)
Ext. Sync. Source (ESB)
Ext. O&M (EOM)
O&M Terminal (OMT)
EPC bus
Transm.
lines
G.703-A
G.703-B
G.703-C
G.703-D
Ylinks    (12 pcs)
Transm.
Interface
Controller
OPT-inputs
OPT-outputs
External alarms
Vcc for backplane memory
IOM-bus
Cabinet LEDs
Rack/Shelf/unit pos
Ext. Ref source
Timing bus
Compact
Flash
Card
Interface
CPU System
Part of
timing
system
OVCXO+DAC
MMI
DXU
13 MHz test
Communication
switch system
Power
supply
+24 V
P007457C
Local bus
Local bus
Figure 64
DXU-21, block diagram
Electrically, the DXU-21 consists of the following main blocks:
•
CPU system
•
Communication switch system
•
Transmission interface controller
•
Power supply
•
Timing system
•
Miscellaneous logic
118 (421)
EN/LZT 720 0008
R1A
2001-06-26
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