Juniper QFX5220, Руководство по оборудованию, Страница: 72 / 247

QFX5220-128C DC Power Cable Specification
QFX5220-128C DC power supplies require a D-Sub 3W3- type connector. The three pins on the connector
provide –48 VDC input (–), return (+), and ground connections to the power supply.
DC power cables, each 4 m (approximately 13.1 ft) long, are supplied with the QFX5220-128C. The
provided cables include the three-pin connector on one end and three insulated wires at the opposite end,
for connection to the site’s DC power distribution system.
Table 22 on page 74 lists the specifications for the QFX5220-128C DC power cables.
Table 22: QFX5220-128C DC Power Cable Specifications
Wire Size Insulation Color Wire Function
Juniper Model
Number
8 AWG (8.4 mm²), 90° C Blue –48 VDC input (–) CBL-JNP-PWR-DSUB
Straight cable
8 AWG (8.4 mm²), 90° C Black Return (+)
8 AWG (8.4 mm²), 90° C Green and yellow Ground
WARNING: For field-wiring connections, use copper conductors only.
WARNING: Power cables must not block access to QFX5220 components or drape
where people could trip on them.
CAUTION: You must ensure that power connections maintain the proper polarity. The
power source cables might be labeled (+) and (–) to indicate their polarity. There is no
standard color coding for DC power cables. The color coding used by the external DC
power source at your site might be different from the color coding for the leads on the
DC power cable provided with the chassis.
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