Comtech EF Data SMS-451 - Manual (Page 21)

SMS-451 Sateliite Switch Revision 0
Introduction MN/SMS451.IOM
1–7
Figure 1-6. SMS-451 Block Diagram with SDM-2020 Modulator and Demodulator with a
HSSI Interface
TT
ST
SD
CA
RT
RD
Cisco
Router
DTE
TT
SD
SMS-
451E
Data
Section
Of
Switch
TT
CA
x
SD
CA
x
SDM-2020
Modulator
ST
ST
SDM-2020
Modulator
DCE
Y-Cable
TA
DCE
Tx
IF
Tx
IF
SMS-
451E
IF
Section
Of
Switch
x = No Connection
Tx
IF
RD
CA
x
SDM-2020
Demodulator
RT
SDM-2020
Demodulator
Rx
IF
Rx
IF
Rx
IF
RD
CA
x
RT
Loop
Test
Translator
(L-Band)
70 MHz
IF
L-Band
or
70/170
IF
DCE
DTE DCE
DTE
Y-Cable, PL/7126-1
Cable,
ECL (Switch) To
HSSI (Router)
PL/6697-1(Standard)
-1 = 4 ft (1.2 meter)
-2 = 6 ft (1.8 meter)
-3 = 8 ft (2.4 meter)