Table 31: Dc Power System Electrical Specifications - Juniper M320 Hardware Manual

M320 Router Hardware Guide
256
Table 30: DC Power Supply Electrical Specifications (continued)
Item
DC input voltage
DC input current rating
Internal Supplementary
Protector

Table 31: DC Power System Electrical Specifications

Item
DC input voltage
DC system current rating
Each DC power supply has a single DC input (–48 VDC and return) that requires a
dedicated 60 A (–48 VDC) circuit breaker. The DC power supplies in slots
must be powered by dedicated power feeds derived from feed
PEM1
supplies in slots and
PEM2
from feed B . This configuration provides the commonly deployed
for the system.
Specification
Nominal: –48 VDC, –60 VDC
Operating range: –40.5 to –72 VDC
NOTE: If the input voltage from the DC power source drops below
–40.5 VDC, the routing platform automatically shuts down. During
automatic shutdown, the circuit remains active. When the input
voltage returns to –42.75 VDC, the router automatically starts up
again and the system returns to normal operation within 30 minutes.
No operator intervention is required.
42 A @ –48 VDC
50 A
Specification
Operating range: –40.5 to –72 VDC
NOTE: If the input voltage from the DC power source drops below
–40.5 VDC, the routing platform automatically shuts down. During
automatic shutdown, the circuit remains active. When the input
voltage returns to –42.75 VDC, the router automatically starts up
again and the system returns to normal operation within 30 minutes.
No operator intervention is required.
65 A @ –48 VDC (nominal)
must be powered by dedicated power feeds derived
PEM3
PEM0
, and the DC power
A
A/B feed redundancy
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