Comtech EF Data C5 - Manual (Page 29)

C5/K1/K3 Integrated Satellite Terminal System Introduction
Rev. 0 1–9
1.4.1 SDT-5200 Indoor Unit
The SDT-5200 Indoor unit (Figure 1-5), here after referred to as the IDU, is divided into
four sections:
! Modulator
! Demodulator
! Interface
! Monitor and Control (M&C)
Modulator - The modulator converts the baseband data to a shaped, modulated IF from
779 to 801 MHz. The modulator output also provides the M&C control link, DC power,
and reference for the terminal outdoor unit.
Demodulator – The demodulator converts an IF of 950 to 1450 MHz down to baseband.
Interface – The interface provides a link between the Digital Test Equipment (DTE) and
the modem. Several industry-standard interfaces are available, as well as EFData
proprietary.
Monitor & Control – The M&C uses a microcontroller to control all operational
parameters and monitor system status. The system also reports modem configuration
status, as well as fault status of the modem. A simple command set allows configuration,
control, and retrieval of status information.
Figure 1-5. SDT-5200 Indoor Unit