Outstanding Issues With The Mx480 Router - Juniper MX480 Hardware Manual

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Outstanding Issues with the MX480 Router

Copyright © 2019, Juniper Networks, Inc.
WARNING: The router is pluggable type A equipment installed in a
restricted-access location. It has a separate protective earthing terminal
(sized for UNC 1/4-20 ground lugs) provided on the chassis in addition to the
grounding pin of the power supply cord. This separate protective earthing
terminal must be permanently connected to earth.
CAUTION: Power cords and cables must not block access to device
components or drape where people could trip on them.
Connecting Power to an AC-Powered MX480 Router with Normal-Capacity Power
Supplies on page 205
Replacing an MX480 AC Power Supply Cord on page 321
Calculating Power Requirements for MX480 Routers on page 158
This topic lists outstanding hardware issues with the MX480 3D Universal Edge router.
For information about software issues, see the Junos OS Release Notes.
In Junos OS Release 10.0R2, if a third AC supply is inserted in an empty slot (even
though the power supply is turned off and the AC cord is not plugged in), the operational
power supplies' output voltage reading in the Junos OS can show an inaccurate number
(60-61V instead of 57V) under some conditions, such as when the load is nearly 100%
and the operating temperature exceeds 40C.
There is an input mode switch on each MX480 DC high capacity power supply, covered
by a small plate. The input mode switch tells the system what capacity feed is
connected (60A or 70A), which in turn is used for power inventory management When
the input mode switch is set to '0' (zero): expect 60A feeds, with a voltage range of
-39V to -72VDC. When the input mode switch is set to '1' (one), expect 70A feeds or
60A feed with minimum voltage range 42V and up. The default setting is 1
In Junos OS Releases 10.0R3, 10.1R2, and 10.2R1, the MX480 DC high capacity power
supply input mode switch is not operating as expected, though this has no effect on
the power supply operations, it will generate alarms incorrectly. [PR532230]
NOTE:
All supplies should have the same feed setting.
Correct usage of the feed setting is required for all supplies in order to
get the desired power inventory management.
Juniper Networks strongly recommends that you install Junos OS Release 8.4R2 or
later before deploying the MX480 router into service.
Chapter 1: Overview
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