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A4-13
A4.4.3
Precautions When Connecting Fiber-optic Cables
Handle fiber-optic cables with care.
Before laying fiber-optic cables, read manuals available from Sumitomo Electric
Industries. Engage a professional contractor specializing in laying fiber-optic cables.
Read “Documents on How to Lay Fiber-optic Cables” under “Introduction” of this manual
and the “Fiber-optic Cable Laying Instructions” (IM34M06C92-01E).
WARNING
-
Always connect and disconnect fiber-optic cables when the system is offline.
Connecting or disconnecting fiber-optic cables when the system is online may affect
normal system operation.
CAUTION
Observe the following precautions when connecting fiber-optic cables.
- Never touch the core of optical connectors with your bare hands and protect them
from dirt and dust.
Dust, dirt and oil from hands may result in degraded transmission performance or
even communications error.
Attach the cover during storage.
- When laying fiber-optic cords or fiber-optic cables, keep the elongation within 0.7%
of permissible elongation percentage. When the cable is secured, the elongation
should be within 0.2% of permissible elongation percentage.
Beyond these elongation limits, fiber-optic cables may break.
For this purpose, refer to Table 4.8 and take care not to subject fiber-optic cables to
excessive tensile impact, bending or twisting. Always pull an fiber-optic cable by its
tension member.
Table A4.8 General Mechanical Characteristics for Fiber-optic Cords and Cables
Tensile Strength (N)
Bending Radius (mm)
Lateral
Pressure
Twisting
Fiber-optic Cord
During laying < 98
When secured = 0
During laying = 15 min.
When secured = 50 min.

< 180°/2 m
Fiber-optic Cable
During laying < 735
When secured = 0
During laying = 50 min.
When secured = 100 min.
980 N/50 mm
(Should be
temporary)
< 90°/2 m
You should strictly observe the restrictions on permissible tensile load specified in the
catalog or technical specification of fiber-optic cables when laying cables.
When securing cables, do not subject connectors and cables to tensile force.
For on-site treatment, we recommend using crimp-on cutting type connectors.
IM 34M06H45-01E
5th Edition : Jan. 2012-00