Sdm-100 Emulation Operation; Table 3-10. Sdm-100 Emulation Parameter Settings - Comtech EF Data SDM-300A Installation And Operation Manual

SDM-300A Satellite Modem
3.4.2.7

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:
•
•
•
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-C data.
Refer to Table 3-10 for SDM-100 emulation parameter settings.
Parameter
Modem Emulation
TX Data/Code Rate
TX-IF Output
RX Data/Code Rate
TX Clock Source
Buffer Clock Source
Modulator Type
Encoder Type
Demodulator Type
Decoder Type
TX Overhead Type
RX Overhead Type
Interface Type
Buffer Program
RTS TX-IF Cntrl
Note: Refer to Appendix A for more information on the asynchronous interface with AUPC.
Rev. 4
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.

Table 3-10. SDM-100 Emulation Parameter Settings

Front Panel Settings
SDM-100
TX-V, QPSK 1/2
ON
RX-V, QPSK 1/2
TX Terrestrial
Satellite Clock
INTELSAT Open, CSC Closed, FDC
Closed, EFD Closed
Viterbi or Sequential
INTELSAT Open, CSC Closed, FDC
Closed, EFD Closed
Viterbi or Sequential
None
None
EIA422, EIA232, V.35
Bits or Milliseconds
OFF or ON
Reference Menu
Utility Modem Type
Configuration Modulator
Configuration Modulator
Configuration Demodulator
Configuration Interface
Configuration Interface
Utility Modulator
Utility Modulator
Utility Demodulator
Utility Demodulator
Utility Interface
Utility Interface
Utility Interface
Utility Interface
Utility Interface
Operation
3–83