User Manual

DXU-21
Ext. Sync. Source (GPS)
Ext. Sync. Source (ESB)
Ext. O&M
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
Timing bus
Compact
Flash
Card
Interface
CPU System
Part of
timing
system
OVCXO+DAC
DXU
13 MHz test
Communication
switch system
Power
supply
+24 V
P007457E
Local bus
Local bus
*
)
*
)
*
) Not valid for DXU-21 A
Indicators and buttons
Figure 1 DXU, block diagram
4.1 CPU System
The heart of the DXU-21 is a 32-bit embedded controller with interfaces to
a wide range of peripherals.
The CPU system consists of:
5 (10)
EN/LZT 720 0244 Uen R3A