Juniper CBL-M40-PWR-IT ユーザーズマニュアル
Prepare the Site
Power System Requirements and Specifications
45
Power Supply Load Sharing, Redundancy, and Replacement
When two power supplies are installed, they are redundant, sharing the electrical load
equally if both supplies are operational. If one power supply stops functioning for any reason,
the remaining power supply instantly begins providing all the power the router needs for
normal functioning, and can provide full power indefinitely.
equally if both supplies are operational. If one power supply stops functioning for any reason,
the remaining power supply instantly begins providing all the power the router needs for
normal functioning, and can provide full power indefinitely.
Power supplies are hot-removable and hot-insertable, as described in “Field-Replaceable
Units (FRUs)” on page 4. For replacement instructions, see “Replace an AC Power Supply” on
page 136 and “Replace a DC Power Supply” on page 141.
Units (FRUs)” on page 4. For replacement instructions, see “Replace an AC Power Supply” on
page 136 and “Replace a DC Power Supply” on page 141.
Connection and Grounding Requirements
On an AC-powered router, plug each power supply into a grounded 180–264 VAC power
receptacle. The receptacle provides the grounding for the router, so no additional grounding is
necessary. The receptacle must be within about 8 ft (2.5 m) of the router and must be easily
accessible.
receptacle. The receptacle provides the grounding for the router, so no additional grounding is
necessary. The receptacle must be within about 8 ft (2.5 m) of the router and must be easily
accessible.
On a DC-powered router, connect each power supply to a separate, dedicated DC power
source. Most sites distribute DC power through a main conduit that leads to frame-mounted
DC power distribution panels, one of which might be located at the top of the rack that
houses the router. A pair of cables (one input and one return) connects each power supply to
the power distribution panel.
source. Most sites distribute DC power through a main conduit that leads to frame-mounted
DC power distribution panels, one of which might be located at the top of the rack that
houses the router. A pair of cables (one input and one return) connects each power supply to
the power distribution panel.
To meet safety and EMC requirements and to ensure proper operation, a DC-powered router
must be earth-grounded before power is connected. Each power supply has a pair of terminal
studs for connecting the router to earth ground.
must be earth-grounded before power is connected. Each power supply has a pair of terminal
studs for connecting the router to earth ground.
For power and grounding connection instructions, see “Provide Power to the Router” on
page 122.
page 122.
AC Power Cord Specifications
Two detachable AC power cords, each 2.5 m (approximately 8 ft) long, are supplied with the
router. The appliance coupler at the female end of the cord inserts into the appliance inlet on
the faceplate of the AC power supply. The coupler is type C19 as described by International
Electrotechnical Commission (IEC) standard 60320. The plug at the male end of the power
cord fits into the power source receptacle that is standard for your geographical location.
router. The appliance coupler at the female end of the cord inserts into the appliance inlet on
the faceplate of the AC power supply. The coupler is type C19 as described by International
Electrotechnical Commission (IEC) standard 60320. The plug at the male end of the power
cord fits into the power source receptacle that is standard for your geographical location.
For both AC- and DC-powered routers, power cords and
cables must not block access to router components or
drape where people could trip on them.
cables must not block access to router components or
drape where people could trip on them.
In North America, AC power cords must not exceed 4.5 m
(approximately 14.75 ft) in length, to comply with National
Electrical Code (NEC) Sections 400-8 (NFPA 75, 5-2.2) and
210-52, and Canadian Electrical Code (CEC) Section
4-010(3). The cords supplied with the router are in
compliance.
(approximately 14.75 ft) in length, to comply with National
Electrical Code (NEC) Sections 400-8 (NFPA 75, 5-2.2) and
210-52, and Canadian Electrical Code (CEC) Section
4-010(3). The cords supplied with the router are in
compliance.