Harmonic SUPRALink 7110-E Series, Руководство по установке, Страница: 28 / 38

© 2009 Harmonic Inc. 28 SUPRALink 7110-Exx, Version 1.0, Rev A
Chapter 5
Maintenance
This chapter describes how to:
■
Clean fiber optic connectors
■
Replace the fan in the SUPRALink 7110-Exx Series
5.1 Cleaning Fiber Optic Connectors
DANGER:
The fiber cable carries invisible laser radiation.
AVOID EXPOSURE TO THE BEAM
. Never
operate a unit that has a broken fiber or a disconnected fiber connector. For further information, see
A.9 Laser Radiation Warning
on page 34.
Dirty optical connectors are the leading source of poor performance in an optical fiber
network. Dirty optical connectors lead to optical signal loss and reflections, which in turn can
seriously degrade carrier-to-noise (CNR) performance and, in some cases, distortion
performance.
Therefore, Harmonic recommends that you clean all mating fiber connectors, before
connecting them to an optical device.
In addition, if you suspect that the optical connector of a SUPRALink 7110-Exx may have
been exposed to contamination (by a dirty fiber cable connector, for example), you should
properly clean the SUPRALink 7110-Exx optical connector before connecting optical fiber.
CAUTION: Improper cleaning of an optical connector can do more harm than good. Never spray a
clean-air product onto the surface of an optical connector. Spraying air onto an optical connector can
cause condensation on the connector surface, leaving water spots and trapping dust. Failing to wipe a
connector on dry lens paper immediately after wiping on paper wet with isopropyl alcohol can also lead to
condensation on the connector. Using low-grade cleaning paper or other cloth to wipe an optical
connector can leave microscopic fibers on the optical connector surface.
5.1.1 Cleaning Patch Cord or Pigtail Fiber Optical Connectors
To clean optical connectors, Harmonic recommends using a fiber optic connector cleaning
cartridge (such as NTT Cletop). If a cleaning cartridge is not available, follow these steps.
1. Fold a piece of unused dry lens cleaning paper twice, for a four-ply thickness.
2. Use a drop of high-grade isopropyl alcohol to wet part of the paper.
3. Lay the connector on the lens cleaning paper with the tip touching the paper.
4. In one continuous motion, pull the connector from the wet part of the paper to the dry
part.
5.1.2 Cleaning Transmitter Module Optical Connectors
To clean the optical connector of a SUPRALink 7110-Exx:
1. Remove the transmitter module from the HLP platform.
2. Inspect the bulkhead adapter for cleanliness with a video inspection scope, if available.