Cisco GS7000 Руководство по техническому обслуживанию - Страница 12

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Connectors and Bulkheads

• Do not look into an unmated fiber or at any mirror-like surface that could reflect light that is emitted

• Do not view an activated fiber with optical instruments such as eye loupes, magnifiers, or microscopes.

• Use safety-approved optical fiber cable to maintain compliance with applicable laser safety requirements.

Connector cleanliness is crucially important for optimum results in fiber optic communications links. Even

the smallest amount of foreign material can make it impossible to obtain the expected insertion and return

losses. This can reduce the range of the equipment, shorten its expected service life, and possibly prevent the

link from initializing at all.

New equipment is supplied with clean optical connectors and bulkheads. Clean these connectors and bulkheads

in the field only if you observe and can verify an optical output problem.

Connectors and Bulkheads

Most fiber optic connectors are of the physical contact (PC) type. PC type connectors are designed to touch

their mating connector to prevent air gaps, which cause reflections. For optimum performance, all dirt must

be removed.

Bulkheads can also become dirty enough to affect performance, either from airborne dust or from contamination

introduced by connectors.

Warning

Avoid damage to your eyes! Do not look into any optical connector while the system is active. Even if the

unit is off, there may still be hazardous optical levels present.

Note

Read the above warning before performing cleaning procedures.

It is important that all external jumper connectors be cleaned before inserting them into the optical module.

Follow these steps to clean fiber optic connectors that will be connected to the optical module:

Important

Before you begin, remove optical power from the module or ensure that optical power has been removed.

1. Inspect the connector through an optical connector scope. If the connector is damaged, e.g., scratched,

burned, etc., replace the jumper.

2. If the connector is dirty but otherwise undamaged, clean the connector as follows:

1. Make several swipes across the face of the connector with the appropriate ferrule cleaner. This will

2. Listen for a slight "squeak" typically generated during this process, indicating a clean connector.

3. Inspect the connector again through the scope to confirm that it is clean.

Maintenance

from an unterminated fiber.

remove dust and some films.

Maintenance