Comtech EF Data SMS-451 User Manual
Page 16

SMS-451 Sateliite Switch
Revision 0
Introduction
MN/SMS451.IOM
1–2
The switch contains:
• Circuitry for the data
• IF
switching
• Remote and local status reporting
• Remote and local control
A 50
Ω
system consists of the following assemblies:
Switch Top Assembly
AS/1781-1
1:1 Switch Modem PCB
AS/1760-1
Chassis Assembly
AS/1780
Front Panel Assembly
AS/1090
Power Supply
PS/AC40W03P02
Cable Assembly (75
Ω)
CA/1798B
Cable Assembly (75
Ω)
CA/1799B
Cable Assembly, DC Power
CA/1772B
A 75
Ω
system consists of the following assemblies:
Switch Top Assembly
AS/1781-2
1:1 Switch Modem PCB
AS/1760-2
Chassis Assembly
AS/1780
Front Panel Assembly
AS/1090
Power Supply
PS/AC40W03P02
Cable Assembly (50
Ω)
CA/1800B
Cable Assembly (75
Ω)
CA/1799B
Cable Assembly (75
Ω)
CA/1798B
Cable Assembly, DC Power
CA/1772B
Additional versions of the SMS-451 also support the SDM-2020 Modulator and
demodulator:
• SDM-2020 with G.703 Interface
• SDM-2020 with ASI Interface
IMPORTANT
The 70/140 MHZ and L-Band versions of the SMS-451 are available to
support the SDM-2020 Demodulator. The TX IF of the SMS-451 is
alaways 70/140 MHz.