OptiX RTN 600
Product Description
Commercial in Confidence
Page 14 of 44
Note:
In the software architecture, the ODU is considered as a logical board. The ODU
board software in the SCC board manages and controls the ODU hardware through
the management channel between the IDU and the ODU.
3.4 Service Signal Processing Flow
The following describes the flow that the OptiX RTN 600 processes service signals
through the example of STM-1 optical signals.
Table 3-3
Transmit direction
No.
Component
Signal Processing Description
1
SL1/SD1 (IDU)
Converts the STM-1 optical signals into STM-1 electrical signals.
Synchronizes and descrambles the frames.
Extracts the overheads from the STM-1 frames.
Transmits the VC-4 signals in the STM-1 frames to the
cross-connect unit through the service bus.
2
PXC (IDU)
Cross-connects the VC-4 signals to the service bus of the
IF1A/IF1B board.
3
IF1A/IF1B (IDU)
Multiplexes the VC-4 signals, microwave frame overheads, and
pointers into STM-1 microwave frames.
Scrambling.
FEC coding.
Digital modulation.
D/A conversion.
Analog modulation.
Combines the analog IF signals and ODU O&M signals. The ODU
O&M signals have been modulated by the auxiliary modem.
Transmits the combined signals and -48 V power to the ODU
through the coaxial cable.
4
ODU
Splits the analog IF signals, ODU O&M signals, and -48 V power.
Converts the analog IF signals into RF signals through up
conversions and amplifications.
Transmits the RF signals to the antenna through the waveguide.
