H3C SR6604 Installation Manual page 49

HIM-CL1P/HIM-CL2P,
HIM-AL1P/HIM-AL2P, HIM-RS2P, HIM-1EXP, or MIC-QP1L.
Optical fibers feature low loss and long transmission distance.
Optical fibers can be classified into single-mode fibers and multi-mode fibers. A single-mode fiber
carries only a single ray of light; a multi-mode fiber carries multiple modes of lights.
Table4-3 Characteristics of single-mode and multi-mode optical fibers
Item
Core
Dispersion
Light source and
transmission
distance
Fiber connectors are indispensable passive components in an optical fiber communication system.
They allow the removable connection between optical channels, which makes the optical system
debugging and maintenance more convenient. There are multiple types of fiber connectors.
Figure4-9 shows an LC connector and MPO connector, respectively.
Figure4-9 LC connector
Figure4-10 MPO connector
Restrictions and guidelines
Some cards on the router provide dust plugs for the fiber ports (such as SFP ports). Before using
such fiber ports, remove the dust plugs. Keep the dust plugs secure. When the fiber ports are not in
use, install the dust plugs.
Fiber connectors are fitted with dust caps. Keep the dust caps correctly when the fiber connectors
are in use. Install dust caps when the fiber connectors are not in use to avoid damage to their end
face. Replace the dust cap if it is loose or polluted.
Before connecting an optical fiber, use dust free paper and absolute alcohol to clean the end face of
the two fiber connectors. You can brush the end faces only in one direction.
HIM-CLS1P/HIM-CLS2P,
Single-mode fiber
Small core (10 micrometers or less)
Less dispersion
Users lasers as the light source often
within campus backbones for
distance of several thousand meters
HIM-MSP2P/HIM-MSP4P,
Multi-mode fiber
Larger core than single-mode fiber (50
micrometers, 62.5 micrometers or greater)
Allows greater dispersion and therefore, signal
loss exists.
Uses LEDs as the light source often within
LANs or distances of a couple hundred meters
within a campus network
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HIM-PS1P,