Comtech EF Data SMS-451 - Manual (Page 40)

SMS-451 Satellite Switch Revision 0
Installation MN/SMS451.IOM
2-14
2.3.2.3 Demodulator IF Inputs (B, RX IF, and A)
These connectors are the RX IF input connectors. The IF input of the prime
modem connects to demodulator A, and the input of the backup modem connects to
demodulator B. RXIF is the input from the customer. The input impedance is 75
Ω
(50 Ω optional), and the frequency range is 50 to 180 MHz.
2.3.2.4 Modulator IF Outputs (B TX IF, and A)
The TX IF output of the prime modem connects to modulator A. The transmit IF output
of the backup modem connects to modulator B. TXIF is the transmit IF output connector.
The IF output of the online modem will be present at this connector. The output
impedance is 75
Ω (50 Ω optional) , and the frequency range is 50 to 180 MHz.
2.3.2.5 Power Connections
The AC power supplies are self-adjusting between 90 and 264 VAC. Manual switching
is not necessary. Maximum power consumption is 10W. The AC power is supplied
independently to each of the two power supplies by two standard detachable, non-
locking, 3-prong power cords.
2.3.2.6 Ground (ERDE)
There is one #10-32 stud available on the rear for the purpose of connecting a common
chassis ground between all of the equipment.