Comtech EF Data SMS-458B - Manual (Page 36)

SMS-458B Modem Protection Switch Revision 2
Installation MN/SMS458B.IOM
2–10
2.3.9 Offline IF Outputs (J17, J27)
J17 and J27 Offline IF output connectors, used as monitor and test points.
Note: J27 is not used in this switch.
The outputs of the backup modulators are routed here when not in use.
When backups are online, the offline primes are routed here.
2.3.10 IF Outputs (J28 through J35)
J28 through J35 Modulator IF switching matrix output connections. They connect to the
external uplink power combiners.
Note: J32 through J35 are not used in this switch.
Notes: Observe the following parameters:
1. During normal operation, the prime modulator IF outputs are switched at this
location.
2. During a fault condition, the backup modulators IF output will be switched at this
location.
3. The frequency range is 50 to 180 MHz, with output impedance of 75
Ω.
4. The typical output power level is equal to the modem TX output level, which is
from -5 dBm to -20 dBm.
5. Any IF outputs that are not being used must be terminated into 75
Ω.
2.3.11 AC Power (J37 and J38)
CAUTION
Applying incorrect input voltage to these connectors can cause severe
damage to the switch and will void the product warranty. Verify that
the source voltage is correct before connecting the switch.
J37 and J38 Two independent, nonlocking, 3-prong power cords connect AC power to the two
power supplies.
Normal input voltage is 90 to 264 VAC, at 47 to 63 Hz (-48
± 4.8 Vdc are optional).
Maximum power consumption is 80 W for each power supply.
2.3.12 Ground
A #10-32 stud is available on the rear panel for connecting the chassis to ground.