
B–63833EN/03
D. OPTICAL FIBER CABLE
399
Optical connector
Optical fiber cord
Reinforcing cover of external
cable or cord binding portion of
internal cord type cable
Bending radius of 25 mm or more
(Make the bending radius as large as
possible.)
Cable clamp
Bending radius of 50 mm or more (for reinforcing cover)
Bending radius of 25 mm or more (for cord binding portion)
(Make the bending radius as large as possible.)
Fig. D.5 Fixing the cable with a clamp
D Any superfluous portion of the cable may be wound into a loops.
Should this prove necessary, make sure the diameter of each loop is at
least 150 mm (for an external cable) or at least 100 mm (for an internal
cord type cable). Winding the cable into smaller loops may produce
sharp curves that exceed the specified bending radius limit without the
user being aware. Such bending can result in a greater transmission
loss, ultimately leading to a communication failure.
D When using a nylon band (cable tie) as a cable clamp, follow the
instructions given below. Also, take care not to apply a bending force
to one particular part of the cable when fixing it with a clamp. Failing
to clamp the cable correctly may cut or damage it.
External cable:
Do not clamp the uncovered portion of the cable with a nylon band.
When clamping the cable by the reinforcing cover, the clamping force
is not an important factor to consider. However, ensure that the
clamping force is as small as possible to ensure that the reinforcing
cover is not deformed by the clamping. If possible, the clamping force
should be 5 kg or less.
Internal cord type cable:
Lightly clamp the optical cable with a nylon band so that the cable
shield is not deformed. If possible, the clamping force should be 1 or
2 kg (make sure that no force is applied to the cable). Due care is
required when clamping the internal cord type cable because its cable
shield is weaker than the reinforcing cover of the external cable.