Errata With The Mx480 Router Documentation - Juniper MX480 Hardware Manual

MX480 Universal Routing Platform Hardware Guide

Errata with the MX480 Router Documentation

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The XFP cages and optics on the MX480 router are industry standard parts that have
limited tactile feedback for insertion of optics and fiber. You need to insert the optics
and fiber firmly until the latch is securely in place. [PR/98055]
Do not mix AC and DC power supplies on an MX480 router. Mixing of AC supplies and
DC supplies may damage your chassis. [PR/233340]
This topic lists outstanding documentation issues:
The shut-down voltage and start-up voltages as stated in the following note in the
MX480 hardware guides and MX480 Quick Start are not correct under all
circumstances: [PR/273771]
NOTE: If the input voltage from the DC power source drops below –36.5
to –38.5 VDC, the router automatically shuts down. During automatic
shutdown, the circuit remains active. When the input voltage returns to
–40.0 to –41.0 VDC, the router automatically starts up again and the system
returns to normal operation within 30 minutes. No operator intervention
is required.
For the cooling system to function properly, the airflow around the chassis must be
unrestricted. Allow at least 8 in. (20.3 cm) of clearance between side-cooled routers.
Allow 5.5 in. (14 cm) between the side of the chassis and any non-heat-producing
surface such as a wall. [PR/258887]
When installing the router without a mechanical lift, remove and reinstall components
from the chassis, first from the rear and then from the front. Components should be
removed and reinstalled in the following order: power supplies, fan tray, SCBs, and
DPCs.[PR/265034]
Replace the air filter, located at the left rear of the router, every 6 months for optimum
cooling system performance.
Two threaded inserts (PEM nuts) are provided on the upper rear of the chassis for
connecting the router to earth ground. The grounding points fit UNC 1/4–20 screws
(American).
The mounting shelf should be installed on the back of the rail as described in the
3D Universal Edge Router Hardware Guide
After installing a DC power cable or AC power cord, route the power cable or power
cord along the cable restraint towards the left or right corner of the chassis. If needed,
thread plastic cable ties, which you must provide, through the openings on the cable
restraint to hold the power cord or cables in place.
Table 7 on page 38 describes the functions of the host subsystem
.
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