Cisco 4000-M Replacement Manual page 2

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Warning
AC units; disconnect the power at the circuit breaker on DC units.
Note
Safety Warnings" in the Cisco 4000 Series Installation Guide.
Caution
body before opening the chassis. Before performing procedures described in this document, review
the sections "Safety Recommendations," "Safety with Electricity," and "Tools and Equipment
Required."
Note
network processor modules are installed in a Cisco 4000 series router.
Warning
card when no cable is connected. Avoid exposure and do not stare into open apertures. Following is
an example of the warning label that appears on the product:
Warning
safety extra-low voltage (SELV) circuits. SELV circuits should only be connected to other SELV
circuits. Because the BRI circuits are treated like telephone-network voltage, avoid connecting the
SELV circuit to the telephone network voltage (TNV) circuits.
Warning
Do not attempt to tamper with or open any public telephone operator (PTO)-provided equipment or
connection hardware. Any hardwired connection (other than by nonremovable,
connect-one-time-only lug) must be made only by PTO staff or suitably trained engineers.
2 Replacing the Cisco 4000 Series Power Supply
Troubleshooting the Power Supply Installation
Cisco Connection Online
Before working on a chassis or working near power supplies, unplug the power cord on
Translations for all safety warnings included in this document are in the appendix "Translated
To avoid damaging ESD-sensitive components, discharge all static electricity from your
The following warnings are applicable if single-mode FDDI, single-mode OC3 ATM, or BRI
Invisible laser radiation may be emitted from the aperture ports of the single-mode FDDI
AVOID EXPOSURE–Invisible Laser rad-
iation is emitted from transmit ports.
The ports labeled "Ethernet," "10BaseT," "Token Ring," "Console," and "AUX" are
The ISDN connection is a source of voltage that should be inaccessible to user contact.
WARNING
1300NM
CLASS 1 LASER PRODUCT