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CDM-750 Advanced High-Speed Trunking Modem
Appendix B
Name
LAN Region
Block 1
Ethernet Switch
Block 2
Terrestrial Port Processor (Tx)
Block 3
Expansion Slot
Block 4
Terrestrial Port Processor (Rx)
Block 5 Deframer
Block 6
Framer
Block 7
Modulator
Block 8
CnC
Block 9
Demodulator
Block 10
µP / M&C / Management
IF Region
Function
This unmarked region of the diagram refers to the LAN – the source / destination for data
traffic. The information of interest is tailored to Ethernet interfaces, so most of the statistics do
not apply to the G.703 interface.
The LAN's access to the modem is at the Ethernet switch. There are two RJ-45
10/100/1000BaseT ports and one optional optical Gigabit Ethernet (SFP module) port
available at the rear of the modem.
Data from the LAN destined to the satellite flows into this block.
This is reserved for future plug-in modules.
This is the counterpart to the Tx processor. It forms Ethernet packets and forwards them to
the Ethernet Switch.
The data from the satellite frames is recovered.
Data processing to assemble data into frames for the modulator is performed in this block.
Frames are mapped into the appropriate FECFrame and mapped into the selected ModCod
for transmission to the satellite.
Signals to and from the satellite are processed here to cancel the locally transmitted carrier
and receive the carrier from the distant end.
Carriers received from the satellite are processed here to recover data frames.
The microcontroller (µP) is involved in collection and calculation of statistics.
This unmarked region of the diagram refers to data to or from the satellite link.
Figure B-1. CDM-750 Data Flow Diagram
B–2
Revision 1
MN-CDM750
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