Reference Manual

4(10)
EN/LZT 720 0244 R1A
4 Function Description
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 1 DXU-21, block diagram