User's Manual

Table Of Contents
Unit Descriptions - RF Path CMA-331-AEN Page 40
Draft
2.1.1.5 PSM (Power Supply Module)
Two types of Power Supply Modules are available:
PSM-AC: 100 240 VAC;
PSM-DC: 48 V DC; 9 A Max.
Note: The power rating for both PSM types is 300 W.
Each headend unit chassis (i.e. HEU/OIU/IHU) can support two PSM modules, where the second PSM provides redundancy
in case one of the supplies fails.
Both types of PSM modules (AC and DC) can be installed in the same chassis.
If two modules are installed, both must be connected to their respective power source (AC or DC) and turned on at all times.
2.1.1.6 PSM-AC (Power Supply Module-AC Power Source)
The PSM-AC includes an AC power connector, on/off switch and Power Status LED. See Figure 2-9.
Figure 2-9. PSM-AC Power Supply Module
2.1.1.7 PSM-DC (Power Supply Module-DC Power Source)
The PSM-DC power source rating is 48 V DC; 9 A Max.; 300 W. The PSM-DC includes a six pin terminal block connector,
supporting up to three DC wire pairs.
Figure 2-10. DC Power Supply Module