Nortel Networks 4134 quick start Cables and connectors protection, Electrostatic discharge

Personal safety and equipment protection 19

•Ensure that your environment meets the requirements for temperature, humidity, and cleanliness. See “Environmental requirements” (page 61).

•Do not overtighten thumb screws or lug nuts. Tighten screws and nuts until they are snug, plus a quarter turn. If you use a power tool to tighten screws, use a low torque setting of 2 to 3 in–lb (0.226 to 0.339 N-m).

Cables and connectors protection

The following practices prevent damage to cables and connectors:

•Use caution when connecting cables. Take care to ensure you insert each cable connector in the correct port for the purpose you intend. For example, ensure you connect LAN cables and connectors to LAN ports on the Secure Router 4134.

•Support cables to prevent any stress on the connectors. If you have a high-density cable configuration, use an appropriate cable management system to relieve stress on the cables. Also ensure that cables are threaded neatly and that you employ cable ties as required.

•Do not exceed the bend radius recommended for the type of cable installed.

•Fiber-optic cables and connectors require special care:

—Cover connectors with rubber safety plugs when they are not connected.

—Before you install or replace fiber-optic cables, clean the connectors.

—Do not exceed the bend radius that is recommended for fiber-optic cable. The acceptable bend radius for fiber-optic cable is ten times its diameter, or 2.5 to 5 cm (1 to 2 in.). If you use a radius of less than the recommended bend radius, a loss of signal integrity can result. Loss of signal integrity caused by incorrect bend radius is difficult to diagnose.

Electrostatic discharge

Electrostatic discharge (ESD) is the transfer of charge between objects at different electrical potentials. ESD can change the electrical characteristics of a semiconductor device, and degrade or destroy it. ESD can cause equipment to malfunction or fail.

To dissipate or neutralize electrostatic charges, use proper grounding and use conductive or dissipative materials.

Nortel Secure Router 4134

Quick Start

NN47263-100 02.01 Standard

18 February 2008

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