Comtech EF Data SDM-300A - Manual (Page 216)

SDM-300A Satellite Modem Revision 6
Modem Types MN/SDM300A.IOM
6-8
6.1.7 SDM-100 Emulation Operation
The SDM-100 Emulation feature of the modem provides remote protocol compatibility
with existing SDM-100 modems, which makes several applications possible:
• Add an SDM-300A to a rack of SDM-100s with a protection switch.
• Replace an SDM-100 requiring service with SDM-300A.
• Use SDM-300A as the backup modem for a rack containing a mix of SDM-100
and SDM-300A modems.
SDM-100 Emulation is typically a closed network application, with no added overhead.
The modem does not required any additional hardware to operate in SDM-100
Emulation. The basic modem configuration, which includes the 25-pin D Data I/O
connector, supports V.35, EIA-422, and EIA-232 data.
Refer to Table 6-8 for SDM-100 emulation parameter settings.
Table 6-8. SDM-100 Emulation Parameter Settings
Parameter Front Panel Settings Reference Menu
Modem Emulation SDM-100 Utility: Modem Type
TX Data/Code Rate TX-V, QPSK 1/2 Configuration: Modulator
TX-IF Output ON Configuration: Modulator
RX Data/Code Rate RX-V, QPSK 1/2 Configuration: Demodulator
TX Clock Source TX Terrestrial Configuration: Interface
Buffer Clock Source Satellite Clock Configuration: Interface
Modulator Type INTELSAT Open, CSC Closed,
FDC Closed, EFD Closed Utility: Modulator
Encoder Type Viterbi or Sequential Utility: Modulator
Demodulator Type INTELSAT Open, CSC Closed,
FDC Closed, EFD Closed Utility: Demodulator
Decoder Type Viterbi or Sequential Utility: Demodulator
TX Overhead Type None Utility: Interface
RX Overhead Type None Utility: Interface
Interface Type EIA422, EIA232, V.35 Utility: Interface
Buffer Program Bits or Milliseconds Utility: Interface
RTS TX-IF Cntrl OFF or ON Utility: Interface