Comtech EF Data OM20 - Manual (Page 42)

OM20 Universal Outdoor Modem OM20 Theory of Operation
MN-OM20– Revision 5 4–4
4.2 OM20 Functional Block Diagram
Figure 4-3 represents the OM20 Functional Blocks. The modem is shown in a typical application
with customer data, TX/RX RF equipment, and antenna I/O.
Figure 4-3. OM20 Outdoor Modem Functional Block Diagram
4.2.1 Baseband Processing
The Baseband Processor performs all of the functions required for an IBS/IDR Framing Unit, a
Reed-Solomon Codec, and an E1/T1 Drop and Insert System. In addition, the Baseband
Processing Section provides for transmit clock selection and rate adaptation as well as a rate
adapter and Plesiochronous/Doppler (PD) Buffer in the receive direction. A multiplexer is also
provided for the SCT Clock Source for Loop Timing Applications. The transmit and receive
paths may be configured independently under processor control.