Comtech EF Data SMS-451 - Manual (Page 35)

SMS-451 Satellite Switch Revision 0
Installation MN/SMS451.IOM
2-9
2.3.1.5 Receive Data (J10, J12, J15)
The RX Data output of the prime modem connects to RX DATA “A.” The RX Data
output of the backup modem connects to RX DATA “B.” RX DATA COM is the data
output to the customer. The characteristic impedance of these connections is 75
Ω from
50 to 180 MHz.
2.3.1.6 Transmit Data (J1, J3, J6)
The TX Data input of the prime modem connects to TX DATA “A.” The TX Data input
of the backup modem connects to TX DATA “B.” TX DATA COM is the data input to
the customer. The characteristic impedance of these connections is 75
Ω from 50 to 180
MHz. The offline unit will always have buffered data.
2.3.1.7 Transmit Clock (J2, J4, J7)
The TX Clock input of the prime modem connects to TX CLOCK “A.” The TX Clock
input of the backup modem connects to TX CLOCK “B.” TX CLOCK COM is the clock
input to the customer. The characteristic impedance of these connections is 75
Ω from 50
to 180 MHz. There will be a 3 dB loss between the COM and the “A” or “B” connector.
2.3.1.8 AC Power (J34, J24)
The 90 to 264 AC power is supplied independently to each of the two power supplies by
a standard detachable, non-locking, 3-prong power cord. Maximum power consumption
is 10W. The input range is 90 to 264 VAC continuous and self-adjusting. The switch is
designed to operate on one power supply.
2.3.1.9 Ground (J25, J26)
There are two #10-32 studs available on the rear for the purpose of connecting a common
chassis ground between all of the equipment.