Table 19: BTI7814 AC Power Entry Module (BT8A78ACM1) Specifications (continued)
SpecificationItem
1
Before using for planning or implementation purposes, contact Juniper Networks Support to confirm the power consumption
values.
2
Running with input voltages below 180 VAC lowers the AC PEM power capacity. See the Power Capacity row above.
3
When running with a 110 V supply, ensure the chassis is equipped with all four AC PEMs.
4
This does not indicate that the AC input voltage is within the acceptable range needed to meet the power requirements of
the chassis.
5
Under normal operation, the PEM provides status information to system controllers across a management bus.
BTI7802 Power
The BTI7802 is powered by field-replaceable power entry modules. Both AC and DC
versions are supported.
NOTE: If your chassis has redundant PEMs, you will be able to replace a failed
PEM while the redundant PEM continues to power the chassis. For more
information, see “BTI7802 Field-Replaceable Units (FRUs)” on page 193.
BTI7802 Power Distribution Plan
The BTI7802 supports redundant power feeds, A and B, that allow the chassis to survive
failure in any one feed. External power is applied to the Power Entry Modules, which, in
turn, power the chassis. Each PEM can power the whole chassis.
BTI7802 DC PEM
The BTI7802 chassis can be powered by up to two convection-cooled 1-Slot/2-Slot
Chassis DC Power Entry Modules (BT8A78PEM1-DC). A non-redundant configuration
requires one DC PEM. A redundant configuration requires two DC PEMs. It is recommended
that you configure your chassis with two DC PEMs.
The PEM slots are numbered PEM 1 (left slot) and PEM 2 (right slot). Each DC PEM can
power the full chassis.
In a redundant configuration, the A feed is applied to one DC PEM, and the B feed is
applied to the other DC PEM. Each feed should be protected with a 30A breaker.
Copyright © 2019, Juniper Networks, Inc.48
BTI7800 Series Hardware Overview and Installation Guide
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