Cisco Systems 78-10588-03 Manuel D’Utilisation
3-19
Cisco Metro 1500 Series Hardware Installation Guide
78-10588-03
Chapter 3
Installing the Chassis
Cleaning the System
Cleaning the Chassis
Be very careful with the air flow system when you clean the chassis. If the
cleaning process has to be done while the system is on, be aware that the airflow
system is in operation. Clean the chassis with a damp cloth only and be careful of
the following:
cleaning process has to be done while the system is on, be aware that the airflow
system is in operation. Clean the chassis with a damp cloth only and be careful of
the following:
•
Do not touch the safety lattice of the airflow system while fans are operating.
•
Do not use wet tissues for cleaning the product's outer housing.
•
Do not use any harsh or abrasive cleaning agents.
Cleaning the Connectors
Fiber optic connectors are used to connect two fibers together. When these
connectors are used in a communication system, proper connection becomes a
critical factor.
connectors are used in a communication system, proper connection becomes a
critical factor.
Fiber optic cable connectors can be damaged by improper cleaning and
connection procedures. Dirty or damaged fiber optic connectors can result in not
repeatable or inaccurate communication.
connection procedures. Dirty or damaged fiber optic connectors can result in not
repeatable or inaccurate communication.
Fiber optic connectors differ from electrical or microwave connectors. In a fiber
optic system, light is transmitted through an extremely small fiber core. 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
contamination at the end of the fiber core can degrade the performance of the
connector interface where the two cores meet. Therefore, the connector must be
precisely aligned and the connector interface must be absolutely free of trapped
foreign material.
optic system, light is transmitted through an extremely small fiber core. 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
contamination at the end of the fiber core can degrade the performance of the
connector interface where the two cores meet. Therefore, the connector must be
precisely aligned and the connector interface must be absolutely free of trapped
foreign material.
Connector, or insertion, loss is a critical performance characteristic of a fiber optic
connector. Return loss is also an important factor. It specifies the amount of
reflected light; the lower the reflection the better the connection. The best physical
contact connectors have return losses better than -40 dB, although -20 to -30 dB
is more common.
connector. Return loss is also an important factor. It specifies the amount of
reflected light; the lower the reflection the better the connection. The best physical
contact connectors have return losses better than -40 dB, although -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 cover
installed when not in use.
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 cover
installed when not in use.