Mx2020Dc Power Supply Module (-48 V) Description - Juniper MX2020 Hardware Manual

Table 31: DC Power Distribution Module (240 V China) LEDs
Color State
Green On
– Off
RELATED DOCUMENTATION
MX2020 Component LEDs on the Craft Interface
MX2020 Power Subsystem Description | 91
MX2000 DC Power Distribution Module (240 V China) Description | 109
MX2000 Router DC (240 V China) Power Subsystem Electrical Specifications | 207

MX2020DC Power Supply Module (-48 V) Description

The MX2020 supports a two zone DC power system. Each zone (upper and lower) is provided power by
one half of the power subsystem. In the DC power configuration, the router contains up to eighteen DC
PSMs located at the rear of the chassis in slots PSM0 through PSM8 (bottom), and slots PSM9 through
PSM17 (top) (left to right). The DC PSMs in slots PSM0 through PSM8 provide power to the lower half
of the router components, MPCs in slot 0 through 9, CB-REs in slot 0 and 1, SFBs in slot 0 through 7, and
Fan Trays 0, 1, and 2. The DC PSMs in slots PSM9 through PSM17 provide power to the upper half of the
router components, MPCs in slot 10 through 19, CB_REs in slot 0, and 1, SFBs in slot 0 through 7, and
Fan Trays 0, 2, and 3.
NOTE: The MX2020 systems configured for DC input power must use only DC PDMs and DC
PSMs. AC and DC PSMs or PDMs must not be mixed within a single system.
Up to nine PSMs may be connected in parallel to increase available system power across MPCs as needed
and provide redundancy.
Description
Positive and negative input feeds are connected. PDM is functioning normally.
Positive input feed is not connected or present.
Negative input feed is not connected or present.
Figure 50 on page 113) shows the DC PSM.
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