Cisco Cisco Packet Data Interworking Function (PDIF) Guía De Instalación
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Replaceable Components
▀ Circuit Cards
▄ ASR 5500 Installation Guide
166
This completes the SDHC card swap out procedure.
Cleaning Fiber Optic Connectors
Fiber optic connectors join optical fibers together. They can be damaged by improper cleaning and connection
procedures. Dirty or damaged fiber optic connectors can degrade communication.
procedures. Dirty or damaged fiber optic connectors can degrade communication.
In a fiber optic system, light is transmitted through extremely small fiber cores. Because fiber cores are often 62.5
microns or less in diameter, and dust particles range from a tenth of a micron to several microns in diameter, dust and
any other contamination at the end of the fiber core can degrade the performance of the connector interface where the
cores meet. Therefore, the connector must be precisely aligned and the connector interface must be absolutely free of
foreign material.
microns or less in diameter, and dust particles range from a tenth of a micron to several microns in diameter, dust and
any other contamination at the end of the fiber core can degrade the performance of the connector interface where the
cores meet. Therefore, the connector must be precisely aligned and the connector interface must be absolutely free of
foreign material.
Connector loss, or insertion loss, is a critical performance characteristic of a fiber optic connector. Return loss is also an
important factor. Return loss specifies the amount of reflected light: the lower the reflection, the better the connection.
The best physical contact connectors have return losses of better than –40 dB, but –20 to –30 dB is more common.
important factor. Return loss specifies the amount of reflected light: the lower the reflection, the better the connection.
The best physical contact connectors have return losses of better than –40 dB, but –20 to –30 dB is more common.
The connection quality depends on two factors: the type of connector and the proper cleaning and connection
techniques. Dirty fiber connectors are a common source of light loss. Keep the connectors clean at all times, and keep
the dust plugs or covers installed when the connectors are not in use.
techniques. Dirty fiber connectors are a common source of light loss. Keep the connectors clean at all times, and keep
the dust plugs or covers installed when the connectors are not in use.
As a general rule, any time you detect a significant, unexplained loss of light, clean the connectors. To clean the optical
connectors, obtain and use a fiber optic cleaning kit and follow the manufacturer’s usage instructions. Clean the ferrule,
the protective tube or cone that surrounds the fiber core, and the end-face surface of the fiber core.
connectors, obtain and use a fiber optic cleaning kit and follow the manufacturer’s usage instructions. Clean the ferrule,
the protective tube or cone that surrounds the fiber core, and the end-face surface of the fiber core.
If a cleaning kit is not available, follow these steps:
1. Use a lint-free tissue soaked in 99 percent pure isopropyl alcohol and gently wipe the end-face of the fiber core.
Wait for five seconds for the surfaces to dry and wipe the surfaces a second time.
2. Use clean, dry, oil-free compressed air to remove any residual dust from the connector.
3. Use a magnifying glass or inspection microscope to inspect the ferrule at angle. Do not look directly into the
aperture. If you detect any contamination, repeat Steps 1 and 2.
Caution:
Because invisible laser radiation may be emitted from the aperture of the port when no cable is
connected, avoid exposure to laser radiation and do not stare into open apertures.