User's Manual

Chapter 3 Observing Safety Guidelines

CAUTION: Heel grounders or similar worn footwear attachments work when the

floor is designed to dissipate static electricity. Also check for the ESD foot wear attachment

connectivity to ground using suitable ESD tester. If the properties of the floor are unknown

or in doubt, use a wrist-strap and make sure it is connected to a piece of electrostatic discharge

(ESD) grounding equipment before proceeding with any maintenance or installation activity.

The following guidelines provide an optimal electrostatic discharge protection:

 Install bays on conductive floor coverings.

 Provide conductive shoes, antistatic wrist-straps and heel grounders to all personnel working

on the equipment.

 Maintain local environmental conditions so that relative humidity around equipment to be

serviced is in excess of 20% (preferably higher than 40%). This lowers the threat of

developing damaging electrostatic levels.

 Implement an ESD training and control program that educates personnel on the hazards of

ESD and simple mitigation procedures that can easily be applied.

Controlling Equipment Environment

The maximum operational long-term ambient temperature of the system location is 40 °C. A

temperature above 40 °C is permissible (according to ETSI EN 300 019-1-3 V2.1.2 Edition

2003-04 for Environmental Class 3.1: Temperature controlled locations and ETSI EN 300 019-2-

3 V2.1.2 for Environmental Class T3.1 and T3.1E: Temperature controlled locations) provided

the probability of occurrence is less than 1%. A temperature of 50 °C is permissible but the

duration should not exceed 72 continuous hours.

Using Optical Fibers

Optical fibers are either single mode or multiple modes. The information in the following

sections applies to all optical fibers.

Handling Optical Fibers

When handling optical fibers:

 Wear safety glasses when you install optical fibers.

 Do not look into the opening of an optical fiber, or the opening of an optical fiber

connector, if the optical fiber is active or the unit has the power turned on.

 Avoid direct exposure to optical fiber ends or optical connector ends where you can access

the laser signal directly.