Help us improve your experience.

Let us know what you think.

Do you have time for a two-minute survey?

MX2008 Power System

 

MX2008 Power System Description

The MX2000 routers are available in -48 V and 240 V China DC power configurations, three-phase (delta and wye) AC power configurations, single-phase power configurations, and high-voltage AC (HVAC) or high-voltage DC (HVDC) configurations. You can add additional power to the rack as needed. The MX2008 router is configurable with up to two AC, DC, 240 V China, or high-voltage second-generation universal (HVAC/HVDC) power distribution modules (PDMs), and up to nine AC, DC, 240 V China, or universal HVAC/HVDC power supply modules (PSMs). The PSMs connect to the top and bottom power backplanes that distribute the output voltages produced by the PSMs to the router components. Table 1 describes the MX2008 DC power components and Table 2 describes the MX2008 AC power components.

Caution

Do not mix AC, DC, 240 V China, or universal (HVAC/HVDC) 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. The systems configured for universal (HVAC/HVDC) input power must use universal (HVAC/HVDC) PDMs and universal PSMs.

Note

The MX2008, MX2010, and MX2020 routers support the same power modules (AC, DC, 240 V China, or universal (HVAC/HVDC) PSMs and AC, DC, 240 V China, or universal HVAC/HVDC PDMs).

Table 1: MX2008 DC Power Components

Component

Description

DC power system

The MX2008 DC power system comprises three components: nine PSMs, two PDMs, and a power midplane. The power system distributes power from a pool of 22.5 KW (20 KW for PSM nonredundant and 2.5 KW reserved for PSM redundancy). This pool provides power to 10 line-card slots, two fan trays, two RCBs and eight SFBs.

DC Power Distribution Modules (PDMs)

In the DC power configuration, the router contains up to two DC PDMs located at the rear of the chassis in slots PDM0/Input0 and PDM1/Input1 (bottom to top). A minimum of one PDM is required per system. Two PDMs provide full redundancy. The DC PDM provides a power interface to nine PSMs. Each DC PDM operates with seven feeds or nine feeds of either a 60-A or 80-A amp current limit. You can select the input feed capacity (60-A or 80-A) by setting the DIP switch on the PDM to the rated amperage of the DC power input feeds. Each DC PDM has seven or nine DC inputs (–48 VDC and return terminals for each input).

Note: The selected input capacity applies to all inputs of this PDM. Selecting 60 A reduces the available power output capacity of the PSMs supplied by this PDM.

In a redundant configuration, the 7-feed DC PDMs support a total of fourteen 60-A or 80-A feeds, and the 9-feed DC PDMs support a total of eighteen 60-A or 80-A feeds.

DC Power Distribution Modules (240 V China)

In the DC power configuration, the router contains up to two DC power distribution modules (PDMs) located at the rear of the chassis in slots PDM0/Input0 and PDM1/Input1 (bottom to top). A minimum of one PDM is required per system (two PDMs per chassis) for nonredundant power. The DC PDM provides a power interface to nine power supply modules (PSMs).

Two PDMs provide full redundancy for the router. In a redundant configuration, a total of a total of eighteen (9-feed DC PDMs) are supported.

DC Power Supply Modules (PSMs)

The MX2008 DC PSMs (-48 V and 240 V China) are hot-removable and hot-insertable. The DC PSMs are a dual redundant feed (INP0 and INP1). To provide feed redundancy, you can connect each DC PSM to two separate feeds from different sources. When both input feeds are present, power is drawn from the feed supplying higher DC voltage. You can set these feeds by using the input mode DIP switch located on the DC PSM (see MX2008 DC Power Supply Module (-48 V) Description). There are two PDMs per power system capable of carrying seven feeds or nine feeds each. Each DC PSM is capable of delivering 2500 W of power if -48 V/80 A is applied to the -48 V PSM, and 240 V/20 A is applied to the China 240 VDC PSM.

Table 2: MX2008 AC Power Components

Component

Description

AC power system

The MX2008 supports connection of a single-phase or three-phase (delta or wye) AC power system. In the three-phase power systems, the AC power going to the PSMs is split into three individual phases (wye) or a pair of phases (delta). Each PSM works on a single phase; therefore, the power system works independent of the type of AC feed connected. You can connect one or two AC 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 PDM provides an AC input connection from the single-phase AC power source, and also provides an input power interface to the PSM through a system power midplane.

AC Power Distribution Modules (PDMs)

The MX2008 supports connection of a single-phase or three-phase (delta or wye) AC PDM. Four AC PDM models are available: three-phase delta, three-phase wye, seven-feed single-phase, and nine-feed single-phase.

  • Each three-phase AC PDM requires two three-phase feeds to be connected. 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 PDM provides an AC input connection from the single-phase AC power source, and also provides an input power interface to the PSM through a system power midplane. The single-phase AC PDMs accept seven or nine AC power cords from a single-phase AC source.

    • Each AC input is independent and feeds one PSM. Up to nine PSMs can be connected through the AC PDM.

AC Power Supply Modules (PSMs)

The MX2008 AC PSMs are hot-removable and hot-insertable. The AC PSMs have a dual redundant feed (INP0 and INP1). One input feed is active during operation. These feeds are set by the input mode DIP switch located on the AC PSM (see MX2008 AC Power Supply Module Description). Each AC PSM works with a single phase derived from either three-phase delta 200–240 VAC (line-to-line) or three-phase wye 200–240 VAC (line-to-neutral). Each AC PSM is capable of delivering 2500 W of power.

Table 3: MX2008 High-Voltage Universal (HVAC/HVDC) Power Components

Component

Description

HVAC/HVDC power subsystem

The MX2008 HVAC/HVDC power system comprises three components: nine PSMs, two PDMs, and a power midplane (PMP). If dual inputs are used, the power system distributes power from a pool of 30.6 KW (27.2 KW nonredundant and 3.4 KW reserved for redundancy). If single inputs are used, the power system distributes power from a pool of 27 KW (24 KW nonredundant and 3 KW reserved for redundancy).

Universal HVAC/HVDC Power Distribution Modules

In the universal HVAC/HVDC PDM power configuration, the router contains up to two HVAC/HVDC PDMs located at the rear of the chassis in slots PDM0/Input0 and PDM1/Input1 (bottom to top). A minimum of one PDM is required per system. Two PDMs provide full redundancy. The HVAC/HVDC PDM provides a power interface to nine PSMs. If feeds that connect to one PDM fail in a redundant configuration, the other feed provides full power. You can install a total of two PDMs into a router. Each HVAC/HVDC PDM operates with nine feeds.

Universal HVAC/HVDC Power Supply Modules (PSMs)

The MX2008 universal HVAC/HVDC PSMs are hot-removable and hot-insertable. The universal PSMs are a dual-redundant feed (INP0 and INP1). To provide feed redundancy, you can connect each PSM to two separate feeds from different sources. When both input feeds are present, power is drawn from both feeds equally. The DIP switch sets which feeds are expected to connected. The input mode DIP switch is located on the HVAC/HVDC PSM (see MX2000 High-Voltage Universal (HVAC/HVDC) Power Supply Module Description). There are two PDMs per system capable of carrying nine feeds each. Each HVAC/HVDC PSM is capable of delivering 3400 W if both feeds are present, and 3000 W if one feed is present.

The MX2008 router supports the power systems models and Junos OS releases in Table 4.

Table 4: Supported MX2008 Power System Components

Name

Model Number

First Junos OS Release Supported

DC PSM

MX2000-PSM-DC

15.1F7 and later

Nine-feed DC PDM

MX2000-PDM-DC

15.1F7 and later

Seven-feed DC PDM

MX2K-PDM-OP-DC

15.1F7 and later

AC PSM

MX2000-PSM-AC

15.1F7 and later

Three-phase delta AC PDM

MX2000-PDM-AC-DELTA

15.1F7 and later

Three-phase wye AC PDM

MX2000-PDM-AC-WYE

15.1F7 and later

Nine-feed single-phase AC PDM

MX2K-PDM-AC-1PH

15.1F7 and later

Seven-feed single-phase AC PDM

MX2K-PDM-OP-AC

15.1F7 and later

Nine-feed Universal HVAC/HVDC PDM

MX2K-PDM-HV

19.4R1 and later

Note

Routers configured with AC, DC, 240 V China, or universal (HVAC/HVDC) PDMs and PSMs are shipped with blank panels installed.

Note

To avoid triggering any PSM-related or power-related alarms for the PSMs that are not used but still plugged into the MX2008 router, make sure that you:

  • Do not connect external power feeds to the PSM through the PDM.

  • Move the DIP switch on the PSMs to the off position.

  • Turn off the PSM by using its ON/OFF switch.

MX2008 Power Midplane Description

The MX2008 power system consists of a power midplane. This midplane is used to connect power from the PDM feeds (AC, DC, 240 V China, or HVAC/HVDC universal) to the input of the PSMs (AC, DC, 240 V China, or HVAC/HVDC universal) as well as the output from the PSMs to the FRUs (MPCs, RCBs, SFBs, and fan trays). The power midplane plugs into the signal backplane. The PSMs and PDMs get plugged into the power midplane.