Comtech EF Data C5 - Manual (Page 223)

C5/K1/K3 Integrated Satellite Terminal System Theory of Operation
Rev. 0 5-13
5.5 Decoder
The IDU can be configured in any of the following forms:
! Basic IDU (Sequential or Viterbi Decoder)
! FAST options (Sequential or Viterbi Decoder)
! FAST options with Reed-Solomon hardware (Sequential or Viterbi Decoder)
Refer to Appendix A for additional information.
5.6 Terrestrial Interface Types
Refer to Table 5-1 for electrical and mechanical interfaces.
Table 5-1. Terrestrial Interface Types
Terrestrial Interface Types Specification
Electrical interface types available
for the EIA-530-A, 25-pin “D” data
I/O connector: EIA-232
EIA-422
V.35
Optional mechanical interfaces: 37-pin “D” EIA-449
34-pin block V.35
50-pin “D”
Interface types available through the
optional 50-pin data I/O connector: ASYNC/AUPC
The terrestrial interface functions include:
! Multiplexing various types of ESC into the data
! Buffering the receive data
! Demultiplexing various types of ESC from the data
! Monitoring and displaying the interface status without interruption of service
The terrestrial interface block diagram is shown in Figure 5-4.
The terrestrial interfaces for the modem are defined by data communication standards
MIL-STD-188/EIA-449, EIA-232, or V.35. The interface receivers and drivers for these
standards, as well as the handshake signals for MIL-STD-188 and V.35, are selectable
through the front panel selection.
Refer to Appendix A for additional information concerning these options.