T640 Dc Power Specifications And Requirements; T640 Dc Power System Electrical Specifications; Table 55: T640 Power System Electrical Specifications - Juniper T640 Hardware Manual

Related
Documentation

T640 DC Power Specifications and Requirements

T640 DC Power System Electrical Specifications

Copyright © 2013, Juniper Networks, Inc.
CAUTION: To comply with intrabuilding lightning and surge requirements,
intrabuilding wiring must be shielded, and the shield for the wiring must be
grounded at both ends.
WARNING: The intrabuilding port(s) of the equipment or subassembly is
suitable for connection to intrabuilding or unexposed wiring or cabling only.
The intrabuilding port(s) of the equipment or subassembly MUST NOT be
metallically connected to interfaces that connect to the OSP or its wiring.
These interfaces are designed for use as intrabuilding interfaces only (Type
2 or Type 4 ports as described in GR-1089-CORE, Issue 4) and require isolation
from the exposed OSP cabling. The addition of primary protectors is not
sufficient protection in order to connect these interfaces metallically to OSP
wiring.
General Electrical Safety Guidelines and Electrical Codes for Juniper Networks Devices
T640 DC Power System Electrical Specifications on page 427
T640 DC Power Supply Electrical Specifications on page 428
T640 DC Power System Requirements on page 430
T640 DC Power Cable and Lug Specifications on page 432
T640 DC Power Distribution on page 433
Table 55 on page 427 lists the power system electrical specifications.

Table 55: T640 Power System Electrical Specifications

Item
DC input voltage
DC system current rating
Appendix D: T640 Power Guidelines, Requirements, and Specifications
Specification
Operating range: –40.0 to –72.0 VDC
NOTE: If the input voltage from the DC power
source drops below –37.5 to –39.5 VDC, the
router automatically shuts down. During
automatic shutdown, the circuit remains active.
When the input voltage returns to –43.0 to
–44.0 VDC, the router automatically starts up
again and the system returns to normal
operation within 30 minutes. No operator
intervention is required.
152 A @ –48 VDC (nominal) (7296 W)
427