OptiX RTN 600
Product Description
Commercial in Confidence
Page 22 of 44
4.5.1 Configuration Requirements
Table 4-5
Requirements for 1+1 SD configuration
Component
Configuration Requirement
IF1A/IF1B
2 PCS (paired in slot 5 and slot 7, in slot 6 and slot 8)
ODU
2 PCS
Antenna
2 PCS
4.5.2 System Block Diagram
Service
interface
unit
ODU
(main)
RF signal
IF signal
IDU
Cross-connect unit
Service signal
Fan and
power
unit
Clock
unit
Control
unit
Auxiliary
interface
unit
IF unit
(main)
IF unit
(standby)
ODU
(standby)
IF signal
RF signal
Baseband
signal
Antenna
Antenna
Control and
overhead bus
Figure 4-6
Block diagram of a 1+1 SD microwave transmission system
4.5.3 Switching Principle
I. Transmit Direction
The cross-connect unit transmits two service signals to the active and the standby IF
units. Normally, only the active ODU transmits the RF signals to the antenna. If the
active IF unit or the active ODU becomes faulty, the standby ODU takes over and
starts to transmit signals to the antenna.
II. Receive Direction
The two antennas transmit the received RF signals to the active and the standby
ODUs. Both the active and the standby IF units always transmit received signals to
each other. When one unit detects that there are bit errors or faults in its received
