Cisco 4500M Installation Guide download pdf (Page 3)

Upgrading Memory in Cisco 4000 Series Routers 3

Safety Recommendations

Warning Before working on a system that has an ON/OFF switch, turn OFF the power and unplug

the power cord.

The following warning applies to routers with a DC power supply:

Warning Before performing any of the following procedures, ensure that power is removed from

the DC circuit. To ensure that all power is OFF, locate the circuit breaker on the panel board that

services the DC circuit, switch the circuit breaker to the OFF position, and tape the switch handle of

the circuit breaker in the OFF position.

Caution To avoid damaging electrostatic discharge (ESD)-sensitive components, ensure that you

have discharged all static electricity from your body before opening the chassis. Before performing

procedures described in this document, review the next section, “Safety Recommendations.”

Safety Recommendations

Follow these guidelines to ensure general safety:

• Keep the chassis area clear and dust-free during and after installation.

• Place the removed chassis cover in a safe place.

• Keep tools away from walk areas where you or others could fall over them.

• Do not wear loose clothing that may get caught in the chassis. Fasten your tie or scarf and roll up

your sleeves.

• Wear safety glasses when working under conditions that may be hazardous to your eyes.

• Do not perform any action that creates a potential hazard to people or makes the equipment

unsafe.

Warning The ISDN connection is regarded as a source of voltage that should be inaccessible to

user contact. Do not attempt to tamper with or open any public telephone operator (PTO)-provided

equipment or connection hardware. Any hardwired connection (other than by a nonremovable,

connect-one-time-only plug) must be made only by PTO staff or suitably trained engineers.

Warning The Ethernet 10BaseT, Token Ring, serial, console, and auxiliary ports contain safety

extra-low voltage (SELV) circuits. BRI circuits are treated like telephone-network voltage (TNV)

circuits. Avoid connecting SELV circuits to TNV circuits.

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Cisco 4500M Installation Guide Page 3