MX2000 AC Power Supply Module Description
There are a total of nine AC power supply modules (PSMs) located
at the rear of the chassis in slots
PSM8 (left to right). The AC PSMs in slots
PSM8 provide power to:
fan trays (
MPCs in slot
CB-REs in slot
SFBs in slot
The MX2000 line of routers supports a three-phase delta AC power system, three-phase wye AC power system, or a single-phase AC power system.
Do not mix AC and DC PSMs or different PDM types within a single system. The MX2000 line of routers configured for three-phase wye AC input power must use only three-phase wye AC PDMs and three-phase AC PSMs. The systems configured for three-phase delta AC input power must use only three-phase delta AC PDMs and AC PSMs. The systems configured for single-phase AC input power must use only single phase AC PDMS and AC PSMs.
In a three-phase AC power system, the AC power going to the PSMs is split into a pair of phases. Each PSM works on a single phase. This means the power system works independent of the kind of AC feed connected. You can connect one or two feeds, depending on the power system configuration, number of PSMs, redundancy, and so on. Each phase from each of the two feeds is distributed among one or two PSMs. One feed has each phase going to two PSMs and the other feed has each phase going to a single PSM.
The single-phase AC power distribution module (PDM) provides an AC input power interface to the PSM through the system power midplane. Up to nine PSMs can be connected to a single-phase AC PDM. Each single-phase AC PDM accepts seven or nine AC power cords from a single-phase AC source. Each AC input is independent and feeds one PSM.
The AC PSMs are hot-removable and hot-insertable.
Up to nine PSMs may be connected in parallel per power subsystem to increase available power for MPCs, as needed and to provide redundancy. Figure 1 shows the AC PSM.
The AC power system provides dual redundant feeds (
INP1). Each PSM takes in
two AC feeds and uses one of the two. One input feed is active during
operation. Each feed is a single-phase AC system 200–240 VAC
derived from a three-phase delta or wye AC input system. These feeds
are set by the input mode DIP switch located on the AC PSM. Move the
input mode DIP switch to the on or off position to determine the power
supply feeds (see Table 1 and Figure 2).
Table 1: DIP Switch Positions on the AC PSM
Left Switch Position
Right Switch Position
Input 0 (
Input 1 (
Both Input 0 and Input 1
A PSM failure triggers the alarm LED on the craft interface. For information about connecting to AC power sources, see MX2000 AC Power System Electrical Specifications.